Spark Plug Gap

66starfire · 01-02-2007, 10:36 AM

Got a 1970 Delta 88 455 Motor.

What should plug gap be? Im thinking around .35-.45 correct?

Anyone know for sure?

Oldsguy · 01-02-2007, 11:18 AM

.030 is what I always used, works fine. I think that is the official spec sheet value.

66starfire · 01-02-2007, 11:58 AM

Ok thanks alot. Gunna go replace those 8 right now then.

66starfire · 01-03-2007, 02:35 AM

just saying, was looking throuh an ac delco spark plug catalog, says that .045 is the gap..that seems a bit big, and .030 seems a TAD small, so Im going with .035 as a sorto middle ground. Hehe Ill se if it works.

Oldsguy · 01-03-2007, 04:35 AM

Was that for your vehicle/engine or a generic setting for the plug? .045 seems too large for standard points ignition, maybe ok for some HEI but.....

texasred · 01-03-2007, 07:32 AM

Just spoke with my local Olds Guru (Dan Sarvis...President of the South Texas Oldsmobile Club, races an unported cast iron head QJetted 1970 442 into the 11s, and great QJet guy if you ever need work done) and he says .030 is the stock gap. If you are using an HEI, you might want to go .035, but not over that.

C.J.

66starfire · 01-03-2007, 10:31 AM

Ok good because Ive got an HEI distributor on it. Prolly should have mentioned that early, my mistake. Thanks for the helpful information guys.

01-02-2007, 10:36 AM	#1 (permalink)
66starfire Member Join Date: Dec 2006 Posts: 61	Spark Plug Gap Got a 1970 Delta 88 455 Motor. What should plug gap be? Im thinking around .35-.45 correct? Anyone know for sure?

01-02-2007, 11:18 AM	#2 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,990	.030 is what I always used, works fine. I think that is the official spec sheet value. __________________ Dan '46 2 door

01-03-2007, 04:35 AM	#5 (permalink)
Oldsguy Administrator Join Date: May 2004 Location: Lees Summit MO Posts: 2,990	Was that for your vehicle/engine or a generic setting for the plug? .045 seems too large for standard points ignition, maybe ok for some HEI but..... __________________ Dan '46 2 door

01-03-2007, 07:32 AM	#6 (permalink)
texasred Super Moderator Join Date: Apr 2004 Location: San Antonio, Texas Posts: 807	Just spoke with my local Olds Guru (Dan Sarvis...President of the South Texas Oldsmobile Club, races an unported cast iron head QJetted 1970 442 into the 11s, and great QJet guy if you ever need work done) and he says .030 is the stock gap. If you are using an HEI, you might want to go .035, but not over that. C.J. __________________ Home of the 1971 Cutlass Supreme convertible Super Karate Monkey Death Car.

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01-02-2007, 11:58 AM	#3 (permalink)
66starfire Member Join Date: Dec 2006 Posts: 61	Ok thanks alot. Gunna go replace those 8 right now then.

01-03-2007, 02:35 AM	#4 (permalink)
66starfire Member Join Date: Dec 2006 Posts: 61	just saying, was looking throuh an ac delco spark plug catalog, says that .045 is the gap..that seems a bit big, and .030 seems a TAD small, so Im going with .035 as a sorto middle ground. Hehe Ill se if it works.

01-03-2007, 10:31 AM	#7 (permalink)
66starfire Member Join Date: Dec 2006 Posts: 61	Ok good because Ive got an HEI distributor on it. Prolly should have mentioned that early, my mistake. Thanks for the helpful information guys.