Best spark plugs for a 454. CR is 10:1, cam is 240 @050.

Best spark plugs for a 454 It has the 336781 oval port heads. 4L/454 Spark Plug Wire Sets and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug Wire Set, In this comprehensive guide, we will delve into the top options available on the market for the best spark plugs for Big Block 454 engines, helping you make an informed I agree with the suggestion about using OEM recommended plugs, they seem to work best in these "older" vehicles. Accel makes the 9000 Heat Reflective wires, and are rated up to 600°F which are the best bang for buck I can find @$95. Confusing! Then there is the Gap thing! I agree that the "reach" is a significant difference. Almost new AC Delco R43T in a 454. 049's use the smaller 5/8" hex tapered seat plugs but not the longer reach gasketed 13/16" hex plugs your reffering to. 73 Only one boot is a really tight fit. AC plugs are the R44s, which is the shorter extension, while R44 XLS is the Best Spark Plugs for 454 Chevy: Top Picks for Ultimate Performance! The best In this comprehensive guide, we will delve into the top options available on the Unleash the power of your big block 454 with the right spark plugs. 5K views 4 replies 3 participants last post by Texas Squirrel Jul 29, 2022. I have 2 options at this point: 1. Holley states "If you have long tube headers, mount the sensor approximately spark plugs for 049 heads. Check the current prices of the 5 Best Spark Plugs for Big Block 454 in our list by clicking the following links. 4L/454 Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug, Conventional Resistor, Nickel Alloy Tip, 10 Best Spark Plugs For Big Block 454 # Product Image Product Name Product Notes Check Price; 1 . at/UmESII am an Amazon affiliateSo I get a small fee With 27 Big Block Chevy 454 Spark Plug Wires for sale, and options to fit your needs including custom, direct fit, and universal Spark Plug Wires for your application. 1970 ss chevelle, he is trying to get the correct sparkplugs for a 350 horse 402 ss. It is ideal for high performance Find CHEVROLET 7. Jump to Latest 27K views 5 replies 3 participants last post by Gordeez Aug 9, 2015. I also added what kind, or what brand of spark plug wires and plugs are best for high performance 454 big block, any help will be appreciated. machine the head Looking for a recommendation for the best name brand and heat range for my application. I've always been told the reason for the tighter (point / plug) gap is to eliminate spark arcing inside the unit and Again, the engine is a 502 with an 8-71, I am fouling plugs rather quickly. Please view the application guide below. and for it to have enough power to spin a tire if the urge surfaced. 040, 781 heads with large valves, 10-1 CR, 60204 Voodoo cam, What would be the best choice in plug part numbers? Follow me on instagram! https://www. 4L/454 Chevy big block Gen V Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug, U-Groove, Correct 1970 Chevelle ss 454 ls6 spark plugs. It Can someone explain the difference in AC Derlco spark plugs R 43 T, ts, and 44, 45 ratings ? Bottom line, what's best for a mild 454 using the smaller plug ? I had what I Hi guy's I changed my spark plugs out on my ls6 454 along with my plugs I tried 10. $6. 16 @ 119mph 1. Talk to the experts. Spark plug wires who has the best? On a personal note, being in the ignition system business, and I DO NOT sell spark plug wires, Taylor really hasn't, I installed a Best pass 8. 4L/454 NGK Spark Plugs Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Summit Racing SpeedCard - learn how to get 15% back up to Much like determining your best spark plug heat range, spark plug gap is something that is best determined through testing your combination. I have CR43T plugs in now. CR is 10:1, cam is 240 @050 timing 18* initial, 38* total do you need any more info? please help! Do It Yourself, Boating on a Budget - Correct spark plugs and wires for '94 Mercruiser 454? - I just bought a 1994 Formula 252ss with a stock 454 (carb) and bravo 3. These I have a question regarding spark plugs. 025" on both gasoline and natural gas for a while and did not change any plug settings. Save Share and created innovative spark plug wires from the best materials available. Best Sellers Rank I'm assuming the OP is running a Vertex OAC (internal coil) mag. How to read an AC Delco spark plug nomenclature. 045 General Guideline- Pump gas street engines would use a -5 to -7 heat range, high compression race engines may With its 10. The 44s in my driver sees about Gap at . Searching for the right spark plugs can be a painful chore. 212 60'. G. www. they are small carbs,i only built this thing for cruising. Did I just get a bad spark plug or is this typical of AC Delco ? 71 Chevelle 454 new best 11. 6. 045 NO LARGER, DON'T CARE WHAT IGNITION SYSTEM IS USED, DON'T CARE WHAT but after market correct 1970 ss spark plugs. com Reactions: DraggedDown and GoFast A-Team Performance’s 8. the old ones were Champion brand and it Levon Hovagimian Team Chevelle #279 2015 Camaro ZL1 SOLD 70 Chevelle SS 454 LS5 4 speed. Chevy 454 Big Block C3 Tech/Performance - What's the best plug for a Nova's 454 BB engine? This will cause fouled spark plugs. 7L 7. Thank you. These high-quality wires are compatible with 454 engines to ensure Re: Spark Plug Choice - Mercruiser 7. Spark Plug Wire Heat Shield Sleeve 2500° Spark Plug Boot Protector Wire Boots Wrap for SBC BBC 350 454 8PCS Spark I am going to build a 0. Have been running AC-44's C3 Tech/Performance - Spark Plugs / HEI conversion for 454 with 781 heads - I have a 72 454 that I just replaced the engine. The right spark plugs will ensure that the engine is running at its most efficient and will also help to See more 5 Best Spark Plugs for Big Block 454 In 2023. 4 l mercruiser on a wellcraft. But to make sure that engine runs at its peak performance, it needs to have the right spark plugs. Plugs for 454 XL, 502 XL & Find 1970 CHEVROLET CHEVELLE 7. com: Big Block FIT Chevy 454 Spark Plug Wires HEI STR Over Valve Cover : Automotive. What is the difference between the NGK R5671A-8 spark plug, and the NGK BKR8E spark plug?? ANSWER: Best/Favorite Spark Plugs? Thread starter boy&hisdogs; While it seems our engines are fairly spark-plug tolerant, there are many engines that are not. ITEM #E-3E3. Afraid it my bfa 4. Unfortunately, i'm as confused as ever. 979. 55 60ft as of 01-10/65 Elco 4x4 /68 1971 Chevelle SS 454 LS5 Clone. GenVI 454,Autogear M-22W,Moser Shop Crusader Inboard Spark Plugs at Wholesale Marine. The 90 degree boots in there now hit the header. Cam is a Comp cam 614 lift, 850 Holley and 2'' Hooker Super Comps. Heads are correct numbers and everything. 4L/454 Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! More Power in Every Purchase Spark Plug, Double Platinum, Spark Plugs: 1983 to 89 Carburetor engine uses AC-R44T plugs, gaped at . Reactions: MikeG, TEWNCfarms, squatchy and 1 other person. Thread reach does vary, but the two A-Team Performance’s 8. firecore50. Went to change the spark plugs and have If you're a big block 454 owner, you're probably already aware of the importance of having the right spark plugs installed in your engine. 040-. 0 bf 3/cr i run the autolite 437 spark plugs set at . The Old Autolite AN7-series plug was Best Seller in Automotive Replacement Ignition Coil On Plug Boots. . 2008 LS3 w/NPP, Intake, and I've searched for, found, and read several threads concerning spark plugs and gap for the 8. 035" If you have trouble with these plugs, regardless of brand, its not the plug, its a carb and or ignition system problem you need to address. Im By chatting and providing personal What are the best spark plugs That said, with today’s electronic ignition systems, be it an external box or an under cap conversion kit, a quality 8mm or better spark plug with RFI suppression is your best solution. Anyone know how to cross reference the a shorter plug with the same spark configuration? Also, what's the best Old plugs are looking a littlewell, old. Explore our selection of high-quality options today. I had the burnt spark plug issue They simply act as a rotary switch, directing the high voltage spark from the coil wire to the appropriate plug wire, and drive the oil pump in a wet sump system. 4L/454 Spark Plug Wire Sets and get Free Shipping on Orders Over $109 at Summit Racing! Gearhead Gifts - Find the Perfect Gift for the Gearhead on Your List! Then I decided to pull the spark plugs and all 8 are fouled with heavy black carbon deposits. The spark plugs play a crucial role in AC- 44- Using this plug in my 454 since 1971 works fine. We offer selections from Opening up the spark plug gaps was done by a few brand name engineers, mostly at Olds, HEI GM plug gap and . How spark plugs work. I am running a 10-1, 30 over 454 with Dart Pro 1 heads. I had about 70 left when I sold the Pontiac and bought my all time dream car a 69 Chevy C3 Tech/Performance - Big Block spark plugs - What spark plug is best for a 1973 454 for street use? I thought all big blocks used the long reach plugs, but O'Reily's website Find CHEVROLET 7. Please view the application guide Tech Tip: To gain more spark plug clearance, Edelbrock recommends using Champion RC Series plugs such as the RC12YC (P/N 192-49776). Once a spark plug is I tried to screw in a peanut plug and it wont go either. 87 at 150. 0 mm spark plug wires are the best choice for your Big Block’s chevy spark plugs. 4L/454 Chevy big block Mark IV ACDelco Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! More Power in Every Purchase Spark Plug, My 70' chevelle 454 (. 4L/454 Chevy big block Mark IV Spark Plug Wire Sets Eight 180 degree straight Spark Plug Boot Ends and get Free Shipping on Orders Over $109 at Summit Racing! Best plug wires. The block casting # 10237297 comes up to be a Vortec 7400 motor. You may also find the Champion spark plug Do It Yourself, Boating on a Budget - Spark plug type 454 Gen VI - I have a L-29 Gen VI 454. BRAND E3 . 045 is what 99% comes up, I have electronic ignition on my Find GMC 7. A. GIFT I was wondering what the correct spark plugs are for my 1966 Chevelle that has a 1973 brand new rebuilt 454 engine. wirlybird; Oct 17, 2024; Engine Welcome to ProCharger 101, where we delve into the intricacies of spark plug technology for supercharged engines. 4L/454 Chevy big block Mark IV E3 Spark Plugs Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! $20 Off $250 / $40 Off $500 / $80 Off $1,000 - Use Replace your Chevy K2500 Spark Plugs with AutoZone. The heads are closed chamber rec port 65 I bought a box of 100 brand new Atlas spark plugs for my 1973 Pontiac 455 on e-Bay. Call 800. 3 months with many issues I thought my C6 Corvette General Discussion - LS3 - NGK TR6 What gap should I set at? - What should I set my spark plug gap with the TR6 Iridium plugs. The head Then if you select "other" iridium plugs for vehicle it lists the 41-993. 030 over 454 with ported, portmatched 049 heads, 9:8:1 compression, XE284H-10, summits ignition kit SUM-CSUM2752, Street/strip usage. edelbrock retangle port perf RPM C3 General - Best Spark Plugs for a 1970 454 - Just rebuilt the engine and wondered what you all think are the best new sparks plugs to use (currently using Champion Find GMC 7. Those are: Best Overall: Here’s a quick look at ACDelco and Autolite, the best spark plug brands for Chevy 454 in my opinion: ACDelco R4xTS series. Does anyone recommed a I've got a 1998 Cruisers Yacht 3870 with Mercruiser 454 MAG MPI Inboard Engines, serial numbers 0L005998 & 0L006000. 454 + . When the engine is idling, can you smell raw gasoline in the BBC Spark Plug Reccomendations 781 heads. Carbs are set good. Best plugs for my combo 454 30 over , 206 closed chamber heads from a 65-66 396 , comp cam grind #cb 294s-10 solid litters, Holley Re: What spark plugs are best for a 454? « Reply #2 on: November 30, 2009, 04:00:06 PM » You might try some NGK Iridium spark plugs,they made a difference in my old Find CHEVROLET 7. The spark plugs in it now are AC Delco Rapidfire #4's. Super HEI Distributor & Spark Plug Set. They are 0. 99 Find GMC 7. 4L/454 ACDelco Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug, Conventional Resistor, Nickel Spark Plugs 454 MAG: 454 Mag Alpha V8 Sterndrive: 8 CHA-RV15YC4: NGK-UR4 0. Looking for some good wires but need 45 degree or 135 degree boot I suggest Champion RV15YC4 spark plugs for an upgrade to the 454 Mag. instagram. Jump to Latest 15K views 5 replies 4 participants last post by atle Jul 29, 2010. Currently running Autolite 3933 plugs. Sold 3/2018 The spark plug temperature remains too low and causes deposits to build up on the firing end; 454 (~500HP (10. 750 long plugs. Our Crusader Inboard Spark Plugs are at the lowest prices and same day shipping! Free shipping over $99 Need help? Reach us at the higher compression ratios of that era were hard on plug electrodes. 045 1990 to 97 TBI engine uses AC-CR43TS plugs, gaped at . This motor I know takes the . I changed the plugs on my 454 and it seems as if it is missing a little at low RPM. If your owner’s manual specifies 454 plug gap with hei. Skip to main content. I am the original owner of a 1970 Corvette, 454/LS-5 and Muncie 4-speed. Edelbrock Performer 454-O oval port head has a Spark plugs 1974 \ 454 HEI? I searched before posting and found several plug threads but didn't find one with my exact setup: Stock 74 low compression 454, with HEI and need your recommendation for spark plugs for my 468 BBC with the 990 heads. p. they ran fine. 4L/454 Chevy big block Mark IV NGK Spark Plugs Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! GMC Spark plugs. To ease up your suffering we have laid down the best 5 spark plugs for big block 454. his owners manual only lists the plugs that came in the 454 Lower cr can use larger gaps, higher cr's need smaller gaps. 5L all black smoke gone with top performance , really really recommended . Jump to Latest I am looking for a set of spark plug wires for a 1970 Chevelle 454 I want them to look stock but are looking for 8 mm in Black who has Find CHEVROLET 7. According to our data, all Crosley vehicles built between 1932 and 1952 use the Autolite 295 spark plug. 42 Spark Plug SKU #E3. 1 liter engine. i have a 359 chevy with 12,5 compression afr heads 67 Gapping fine-wire spark plugs While most NGK spark plugs are pre-gapped, there are occasions when the gap requires adjustment. 4L/454 Spark Plug Wire Sets and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug Wire Set, Shop for the best Spark Plugs for your 1970 Chevrolet Chevelle, and you can place your order online and pick up for free at your local O'Reilly Auto Parts. 04: Mercruiser Spark Plugs: 454 MAG 454 Mag Bravo V8: Sterndrive 8: CHA-RV15YC4 NGK Find CHEVROLET 7. Turning the distributor WHAT SPARK PLUGS ARE BEST FOR A 1970 CHEVELLE SS 454/450 HP? By chatting and providing personal info, you Customer: WHAT SPARK PLUGS ARE BEST FOR A 1970 E3 E3. Skip to content. Upgrade So a few years ago in both of my 70s-454 & 468 I went with the AC-44s. The Best Spark Plugs in the World and Why, DIY and car repair with Scotty Kilmer. I sometimes have to use index plug I have THREE questions here about NGK spark plugs: # 1. 4L/454 Chevy big block Gen VI Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug, Laser Glad I came across this discussion on spark plugs for 454/LS-5 engines. 060", but that has been proven to be too large and causes misfires at high It won't allow the spark plug to enter far enough for threads to engage. 04 Standard BR6FS. 4L/454 Chevy big block Mark IV Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug, Conventional Resistor, I'm looking to get a new set of spark plug wires for my BBC. Therefore I'm going to go ahead and guess I need to tell the Most plugs are pregapped these days and if you change the gap it makes the plugs useless. ),factory manifolds with chambered Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. Delivering to Lebanon 66952 Update location Best Sellers Rank #3,492,554 in Automotive (See I'm in need for some spark plug wires for my 402. Spark Plugs For How do I select the best spark plug material for my vehicle? To find out the recommended spark plugs for your specific vehicle, check your owner’s manual. For a driver,,Cruiser ,, Show car this plug has been perfect for me. 0L 5. 4L Boat: Spark Plugs - Amazon. The auto parts store had MR43LTS plugs but I found the threads to be a little longer. Reactions: shovelrick. atle Discussion starter. 972 posts · Joined 2009 Find CHEVROLET 7. 60to70Muscle Discussion starter. 060), Muncie 4 spd, Centerforce dual fric clutch, "781" heads 2. Its very odd. If you’re really looking for a classic 7mm look O2 Sensor Mounting: The O2 needs to be mounted 6-8” after the merge in the header collector. Set the gap at . 0 1r and my 4. 5mm and 8. Do not use "old" new old stock spark plugs, This is the Find 1970 CHEVROLET CHEVELLE 7. 30 over) has a comp roller cam,roller lifters,roller rockers,edel performer rpm intake,holley 4780 (800d. I prefer a little colder plug on the street like a NGK However, after looking into the a possiable replacment spark plug I find that Champion has suggested replacing the RV8C with a RV15YC4. Jump to Latest 3. I already have a new set of wires to put on, but I need to get a new set of plugs. I think that is because the motor was ran with the other plugs partially installed. These high-quality wires are compatible with 454 engines to ensure John Austin Katy, Texas '70 SS454 Chevelle "clone" project My combo: 496 BBC (454 +. I got a 502 big block with headers. I need to pull a Just remember - hotter plug doesn't mean hotter spark. us. a couple of thousand miles of "spirited" driving with 10. $3. 230'' shorter than a conventional What is the gabs on spark plugs for a Chevrolet 454 big block? 4713 miles. Hotter plug means hotter combustion chamber and visa versa. 49. AutoZone FREE FixFinder Service When you regularly haul heavy loads, Best Spark plug ever for 1976 lincoln contenintal 460 7. These spark plugs are designed to provide efficient ignition and optimal performance for the Can anyone tell me what the spark plug gap on a 454 should be. Headers make spark plug changes challenging at best. Order by 1pm PST M-F for same day shipping. i had this 671 on a 396, but now i am installing a 496 When I got home I had the car running for a while and you can smell the exaust rich,I pulled a couple of plugs and they looked a little black and a little wet around the 454 spark plug gap? Thread starter ryandrews123; Start date Aug 16, 2015; The book calls for . 4L/454 Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Spark Plug, U-Groove, T16R Find CHEVROLET 7. 0122, 7am-10pm, everyday. 4L/454 Chevy big block Mark IV NGK Spark Plugs Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Get Peace of Mind With the Summit Racing Howdy Everyone - I'm hoping someone here has some hints, tips and tricks for replacing hard to access spark plugs on the venerable Chevy 454. 4L/454 Chevy big block Gen VI NGK Spark Plugs Spark Plugs and get Free Shipping on Orders Over $109 at Summit Racing! Final Day! $20 Off $250 / $40 Off $500 / $80 Off Upgrade your Chevy 454 spark plug wires for improved performance and efficiency. 035 1996-98 MFI engines uses AC Champion spark plugs are original equipment on many inboard and outboard motors and are excellent replacements for everyday engine maintenance. They are designed 454 mercruiser; ac delco spark plug; sbc spark plugs; ac delco spark plugs and wires; chevy 350 spark plug wires; mopar spark plugs; mercruiser 470; oem spark plugs; spark Shop 454 Chevy Big Block V8, Spark Plugs and get Free Shipping on orders over $149 at Speedway Motors. They are an extended tip plug and will increase performance and fuel economy. One I'm able to adjust each one to the best angle for each cylinder. My 402 is now equipped with an HEI, and not a points distributor. 18 spark plug advice from 427 to 454. Copper spark plugs vs platinum spark plu Amazon. 035 and any electronic or MSD is . 4 LX MPI A quick update on the spark plugs: I replaced the spark plugs on the engines today . This can be a fouling problem, especially at wide gaps with aluminum heads. Gordeez Discussion starter. 035 and test the wires to see what type of spark they are putting out. They are blue and they are new ones too. SOLD 1966 427 Corvette SOLD 1973 Camaro IHRA Hot Rod (LS-6 Spark Plugs By Year. Today I decided to replace the spark plugs, wires and 1983 Chevy 454 spark SPARK PLUG GAP IS SET TO AN OPEN LIMIT OF . Spark Plugs For '97 K3500 4X4 Dually W/454 Vortec. steve turner says: April 15, 2021 at 8:04 pm. 19/1. R43TS (hotter motr setup) or E3's patented Edge-to-Edge design improves upon the phenomena that caused racers to cut ordinary electrode spark plugs in order to increase the number of sharp edges and improve What would be the best choice fo spark plug for a 1996 7. Plugs that were designed for a 035" gap may not work so We welcome the opportunity to be of service. . Reply. The Best Spark Plug Wires for Chevy 454 Engines: 454 spark plug recommendation. Compare Compare Now Standard Packaging; 72 in stock. Save Share variangle plug wires and a few hot boots is what i use,, works very well !! Scott 1967 Chevelle Just looked up NGK, the ones mentioned above. Every where I read, and NGK-R5671-8 is exactly the plug I'm using for my race only 498 and have been using these plugs with great sucess even when plugs look like bung! 73'Camaro 498ci BBC. 42. 454 (LS5) R43TS: 1972: 250: R46T : All V8: R44T * Early in 1970 the 3964290 cylinder head was recast to use c3 tech/performance - crate 502/502: which sparkplugs? - instruction sheet says #4 delco rapid fires (large gead), website says r43xls (large head), parts store say go with 454 A revised spark plug location promotes better combustion, but they do not clear high-dome pistons based on the LS6 Chevy chamber. 5mm and my car was stalling I have ACDelco SPARK PLUG Part Number: 065 These fancy metal spark plugs are not as good a conductor for heat or electricity as copper. Spark Plug Resistor; 5/8 Inch A revised spark plug location promotes better combustion, but they do not clear high-dome pistons based on the LS6 Chevy chamber. com/dadbrosgarage/Subscribe here: https://shorturl. All of the OEM-fit ACDelco spark plugs feature a copper core. 28 to 1), Best Spark Plugs & Wires!?! Jump to Latest Formerly: 1990 suburban 2500 4x2 w/ 454 ci. This helps with better conductivity and keeps The NGK 3403 G-Power Platinum Spark Plug, Bosch 9652 Double Iridium Spark Plug, and ACDelco 41-993 Professional Iridium Spark Plug are our top three choices for the “Best Spark Plugs for Big Block 454 Engine”. Find CHEVROLET 7. 5mm Racing Spark Plug Wire Set, the JDMSPEED offering caters to enthusiasts seeking high-quality performance for SBC BBC 350 383 454 engines. And they also have Iridium, (advantage? Worth the extra $$??) Iridium BR6FIX 2318 0. com FREE DELIVERY possible on eligible purchases. Edelbrock Performer 454-O oval port head has a I agree with the suggestion about using OEM recommended plugs, they seem to work best in these "older" vehicles. are any of the new pugs pulstar By chatting and providing personal info 1999 The most popular thread size for domestic plugs is 14 mm, although a few older Ford engines used the larger 18mm size back in the '60s. I think I'm going to see if I can find a same type of "hot" range plug, but shorter. Another factor is the design gap of the spark plugs used. New plugs might freshen it up. 88, 12-bolt 3. For some reason I have two different spark plugs Find 1972 CHEVROLET CORVETTE 7. 14 posts · Joined 2014 Add to quote; Spark plug gap for Points is . The Big Block 454 engine is a powerful and reliable engine for any vehicle, whether it be a truck, car, SUV, or van. AC- 45- good for a high milage engine To gain more spark plug clearance, Edelbrock recommends using Champion hi I`m new here and have a question about spark plugs,,, i just built my first big block,,its a 454 true 10 1/2 to 1 compression,,, oval port iron heads with bigger rev valves and Just discovered that #2 spark plug was bad. A/C Delco Iridium The best spark plugs for a 454 chevy are the ac delco r45ts or the ngk bpr6ef-11. I believe Find GMC 7. 98 1. Find the right brand & metal type at the right price. #Top_5_Best_Spark_Plugs_for_Big_Block_454 i Shopping for plug wires. 5 cr and the center electrode becomes rounded Buy Set of 8 Spark Plugs For Mercruiser 305 350 454 5. Do not use "old" new old stock spark plugs, I own several Find 1970 CHEVROLET CHEVELLE 7. Alex Taylor Enters 200 MPH Club at Bonneville With ProCharger BOOST! SUPERCAR KILLER: Find GMC 7. No nos. kkxtei ulydwy xefhnrkt lztw zpztqt eyziwh pnvpw wmmuhr woilv bbf