What Spark Plug with HEI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**CPNE** · 09-08-2003, 09:30 AM

This has been answered before but I'm unable to locate the thread.

I have a basically stock 350 (ya I know, go figure!

) with a GM HEI and Edelbrock 650 4bbl carb as the only upgrades. I need to know what plugs and gapping to use. They guy at NAPA said there are a bunch of different plugs that can be used depending on year etc.

If it matters, it's got stock rams horns and a 3 speed manual tranny.

The plugs at NAPA are A/C Delco, but if you have another suggestion that can be bought at VIP I can shop there too.

Thanks

hgs_notes · 09-08-2003, 09:41 AM

This may not be correct, but what I did was look up the gap for the vehicle the distributer came out of. I know it was like twice as much as the stock points distributer.

HG

tom hand · 09-08-2003, 09:56 AM

Use the plugs you are using now if you are having no problems...ie they are the correct heat range. Gap them at 45 and you are all done

**CPNE** · 09-08-2003, 10:01 AM

I should have mentioned this is a new project and the plugs in the engine are probably wrong and do need replacing. The HEI is from an unknown vehicle but is the 4 wire pre-computer variety.

JimKshortstep4x4 · 09-08-2003, 10:03 AM

Since most of our driving is short trips, we run R45TSX AC plugs, gapped at .045. If you do long trips a lot, you may want to drop the heat range, (R43 or R44).

Jim

**CPNE** · 09-08-2003, 10:08 AM

Thanks Jim. That was the one NAPA concluded may be correct. And it'll be a short haul truck. Thanks

09-08-2003, 09:30 AM	#1
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	What Spark Plug with HEI This has been answered before but I'm unable to locate the thread. I have a basically stock 350 (ya I know, go figure!) with a GM HEI and Edelbrock 650 4bbl carb as the only upgrades. I need to know what plugs and gapping to use. They guy at NAPA said there are a bunch of different plugs that can be used depending on year etc. If it matters, it's got stock rams horns and a 3 speed manual tranny. The plugs at NAPA are A/C Delco, but if you have another suggestion that can be bought at VIP I can shop there too. Thanks __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-08-2003, 09:41 AM	#2
hgs_notes GEARHEAD Join Date: Aug 2003 Location: MN Posts: 6,126	This may not be correct, but what I did was look up the gap for the vehicle the distributer came out of. I know it was like twice as much as the stock points distributer. HG __________________ If no one knows what you're doing, they can't tell you you're doing it wrong HG's Dream Car Build - Shelby Cobra Kit Build your own adjustable track bar 71 Long Fleet C/10 72 Jimmy 4x4 (Junkyard Jimmy) HG's Plow Truck '78 K35 Dually Bigass Farm Truck HG's thread of miscellaneous stuff

09-08-2003, 09:56 AM	#3
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	Use the plugs you are using now if you are having no problems...ie they are the correct heat range. Gap them at 45 and you are all done __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

09-08-2003, 10:01 AM	#4
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	I should have mentioned this is a new project and the plugs in the engine are probably wrong and do need replacing. The HEI is from an unknown vehicle but is the 4 wire pre-computer variety. __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-08-2003, 10:08 AM	#6
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,662	Thanks Jim. That was the one NAPA concluded may be correct. And it'll be a short haul truck. Thanks __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

09-08-2003, 10:03 AM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Since most of our driving is short trips, we run R45TSX AC plugs, gapped at .045. If you do long trips a lot, you may want to drop the heat range, (R43 or R44). Jim

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.