Sparkplugs for HEI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

don t. - 72gmc · 05-13-2009, 04:56 PM

I honestly have searched but dang if I can find it.

Gonna switch my 70 GMC stock 400 bb to HEI this weekend.
(THANKS to those about Skip White parts!!).
I know I'll need new plugs. Would like to stick w/AC Delco.
Which plugs work best.

TIA.....don t. ....

sjarrett71 · 05-13-2009, 05:49 PM

R45TS is a popular AC Delco part number.

don t. - 72gmc · 05-16-2009, 08:05 PM

Thanks for the part number. Got everything else done cept for the plugs. I went to Napa this afternoon. I compared the Autolite 145 that is currently in the truck to the R45TS. The R45TS plug is a 1/4" longer. Im thinking to long is not good. but didn't know for sure and left w/o buying any, firgured I'd check here.

TIA.....don t. .....

Irishpilot · 05-16-2009, 09:51 PM

I may be wrong on this, but the only difference between HEI and non for spark plugs is the gap. I think HEI for a stock 400 is somewhere between .040-.060. I run my HEI 406 at .050.

**Stocker** · 05-16-2009, 11:34 PM

Quote:

Originally Posted by Irishpilot

I may be wrong on this, but the only difference between HEI and non for spark plugs is the gap.

That's my understanding, at least for my 350. Gapped at .035 with points, .045 with HEI.

**El Jay** · 05-17-2009, 01:51 AM

The info that I have right at hand says R-44T, gapped at .045.

don t. - 72gmc · 05-17-2009, 03:07 AM

Thank you for the info.
Planning on cleaning and regapping the current plugs to .045 and see what happens. If all is ok, I'll put AC plugs in later today.

Thanks again, I really do appreciate it.......don t. .....

**Stocker** · 05-17-2009, 10:19 AM

Dopey me, I just realized your sig (don t) is taken from your username....

When I read this thread last night, I though it said 'don't' and I was wondering, why not?

sjarrett71 · 05-17-2009, 10:52 AM

Quote:

Originally Posted by Stocker

Dopey me, I just realized your sig (don t) is taken from your username....

When I read this thread last night, I though it said 'don't' and I was wondering, why not?

Me too

don t. - 72gmc · 05-17-2009, 04:27 PM

Quote:

Originally Posted by Stocker

Dopey me, I just realized your sig (don t) is taken from your username....

When I read this thread last night, I though it said 'don't' and I was wondering, why not?

Sorry, I've been using ...don t... for a long time.
I have a fear of the shift key(big grin).

Have fun.....don t. .....

Longhorn Man · 05-17-2009, 04:43 PM

... don't what?

**El Jay** · 05-17-2009, 04:54 PM

Quote:

Originally Posted by Longhorn Man

... don't what?

Stop thinkin' about tomorrow.

05-13-2009, 04:56 PM	#1
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 394	Sparkplugs for HEI I honestly have searched but dang if I can find it. Gonna switch my 70 GMC stock 400 bb to HEI this weekend. (THANKS to those about Skip White parts!!). I know I'll need new plugs. Would like to stick w/AC Delco. Which plugs work best. TIA.....don t. ....

05-13-2009, 05:49 PM	#2
sjarrett71 Registered User Join Date: Dec 2006 Location: Rolla, MO Posts: 2,463	Re: Sparkplugs for HEI R45TS is a popular AC Delco part number. __________________ -Scott-

05-16-2009, 08:05 PM	#3
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 394	Re: Sparkplugs for HEI Thanks for the part number. Got everything else done cept for the plugs. I went to Napa this afternoon. I compared the Autolite 145 that is currently in the truck to the R45TS. The R45TS plug is a 1/4" longer. Im thinking to long is not good. but didn't know for sure and left w/o buying any, firgured I'd check here. TIA.....don t. .....

05-16-2009, 09:51 PM	#4
Irishpilot Registered User Join Date: Jul 2006 Location: Kunsan AB, South Korea Posts: 187	Re: Sparkplugs for HEI I may be wrong on this, but the only difference between HEI and non for spark plugs is the gap. I think HEI for a stock 400 is somewhere between .040-.060. I run my HEI 406 at .050. __________________ 1971 C-10, 406ci, restoration begun! 406ci sb; zero decked, bored .030, edelbrock aluminum e-tec heads, edelbrock performer RPM intake, comp 268 cam, comp 1.6 pro-magnum roller rockers, MSD street fire HEI, MSD 8.5mm wires, Holley Street demon 770, Hedman LT headers. 10.6:1 compression, Air Ride Tech bags on all 4-corners.

05-17-2009, 01:51 AM	#6
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Sparkplugs for HEI The info that I have right at hand says R-44T, gapped at .045. __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

05-17-2009, 03:07 AM	#7
don t. - 72gmc Registered User Join Date: Dec 2001 Location: harvard, il. USA Posts: 394	Re: Sparkplugs for HEI Thank you for the info. Planning on cleaning and regapping the current plugs to .045 and see what happens. If all is ok, I'll put AC plugs in later today. Thanks again, I really do appreciate it.......don t. .....

05-17-2009, 10:19 AM	#8
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,728	Re: Sparkplugs for HEI Dopey me, I just realized your sig (don t) is taken from your username.... When I read this thread last night, I though it said *'don't'* and I was wondering, why not? __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

05-17-2009, 04:43 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Sparkplugs for HEI ... don't what?



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