spark plug suggestions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 11-07-2005, 07:30 PM

Getting ready do replace wires and plugs. I have an accell HEI with msd module and accell super coil. built 355 around 330 hp.

I am looking at NGK ugrooves or good ole ac delco. Two question
Which ones do you suggest part (ie acdelco r45) and what gap thinking .45 or so?

I know this is a debatable subject but just need help deciding.

Thanks

jsbgump · 11-08-2005, 02:02 AM

Personally I'd go with ac delco r45ts if you have small plug heads(5/8) or the r 45 if you have the big plug heads(13/16). Out of all the othe plugs out there ngk would be the only other thing I'd run other than delco. Just my .02 cents.

farside847 · 11-08-2005, 12:21 PM

Stock is a .35 gap. I dont know if Id go over .40

What gap are you running now? Increase it a little and see how it
runs, you can always gap them bigger after a few days.

70rs/ss · 11-08-2005, 12:31 PM

Run .45, with and HEI and bigger coil it should be able to throw a longer hotter spark.

Jim_PA · 11-08-2005, 03:56 PM

I've used Autolite 25's in every SBC I've owned (well, that's only been 4), but they work well for me.

Robert1970C20rstbukt · 11-08-2005, 06:31 PM

I had R44's with the stock points distributor but went to R45TS plugs, they burn really clean and I never had a problem with 'em.

Fatback · 11-08-2005, 08:34 PM

Quote:

Originally Posted by Jim_PA

I've used Autolite 25's in every SBC I've owned (well, that's only been 4), but they work well for me.

Autolites for me too. I bought one set of AC's for my 79, one plug was dead....I ended up having to use of the Autolites I took out.

Cat Fuzz · 11-08-2005, 10:04 PM

Autolite 26's for me. I don't buy any of the fancy spark plug gimmicks.

.045 gap is proper for an HEI system.

Jim_PA · 11-08-2005, 11:48 PM

Quote:

Originally Posted by Cat Fuzz

Autolite 26's for me. I don't buy any of the fancy spark plug gimmicks.

.045 gap is proper for an HEI system.

26's are what... 1 step colder I believe?

70c10 · 11-09-2005, 08:05 AM

I run Autolite AP 26 plugs and like them.

**Green Machine** · 11-09-2005, 11:24 PM

What ever you run, get something with an extended tip, runs cleaner and puts the spark that much closer to the center for faster burn. I've been using champions, but some don't like champions.

55chevy · 11-10-2005, 02:10 AM

I didn't like the cheap Autolites I bought, I have had good luck with Bosch Platinum plugs, the low cost ones, always had good luck with them, they cost a little more than AC and Autolite but they are worth it.

11-07-2005, 07:30 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	spark plug suggestions Getting ready do replace wires and plugs. I have an accell HEI with msd module and accell super coil. built 355 around 330 hp. I am looking at NGK ugrooves or good ole ac delco. Two question Which ones do you suggest part (ie acdelco r45) and what gap thinking .45 or so? I know this is a debatable subject but just need help deciding. Thanks __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

11-08-2005, 02:02 AM	#2
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: spark plug suggestions Personally I'd go with ac delco r45ts if you have small plug heads(5/8) or the r 45 if you have the big plug heads(13/16). Out of all the othe plugs out there ngk would be the only other thing I'd run other than delco. Just my .02 cents. __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

11-08-2005, 12:21 PM	#3
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	Re: spark plug suggestions Stock is a .35 gap. I dont know if Id go over .40 What gap are you running now? Increase it a little and see how it runs, you can always gap them bigger after a few days. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

11-08-2005, 12:31 PM	#4
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,271	Re: spark plug suggestions Run .45, with and HEI and bigger coil it should be able to throw a longer hotter spark.

11-08-2005, 03:56 PM	#5
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: spark plug suggestions I've used Autolite 25's in every SBC I've owned (well, that's only been 4), but they work well for me.

11-08-2005, 06:31 PM	#6
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	Re: spark plug suggestions I had R44's with the stock points distributor but went to R45TS plugs, they burn really clean and I never had a problem with 'em. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

11-08-2005, 10:04 PM	#8
Cat Fuzz My son, my joy. Join Date: Sep 2003 Location: Spokane WA Posts: 463	Re: spark plug suggestions Autolite 26's for me. I don't buy any of the fancy spark plug gimmicks. .045 gap is proper for an HEI system. __________________ '69 Chevy 3/4 ton, 327cid, Carter AFB, Edelbrock intake, HEI, TH400. Founding member of the No Money To Spend On My Truck Club. When your at Home Depot, you WISH you had gotten an 8 foot bed!

11-09-2005, 08:05 AM	#10
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: spark plug suggestions I run Autolite AP 26 plugs and like them. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

11-09-2005, 11:24 PM	#11
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: spark plug suggestions What ever you run, get something with an extended tip, runs cleaner and puts the spark that much closer to the center for faster burn. I've been using champions, but some don't like champions. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

11-10-2005, 02:10 AM	#12
55chevy Car Truck Bike Nut Join Date: Aug 2005 Location: Suffolk Virginia Posts: 850	Re: spark plug suggestions I didn't like the cheap Autolites I bought, I have had good luck with Bosch Platinum plugs, the low cost ones, always had good luck with them, they cost a little more than AC and Autolite but they are worth it. __________________ Snow free Florida panhandle, don't miss Indiana winters Temp in Suffolk Virginia, Sentenced 2 to 5 years LOL 68 shortfleet project 94 3500 TD dually so many cars so little time 72 K2 CST 2WD Blazer



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