Best plug and gap

ac delco. .035 should be good. im sure someone will come aroudn with a part number. do a search - its been covered before.

wow, .035 i would have thought more than that. I picked up a set of ac delco's already part # 41-630

Just seeing if there's something better out there before i put em in.

the first set i got was a set of nippon denso. fuckers fouled up, but kept on ticking. i played with a couple of different ac delco plugs before i found the right ones for my application

Originally posted by cashmoneyspeed@Sep 5 2005, 12:48 AM~3753779
wow, .035  i would have thought more than that.  I picked up a set of ac delco's already part # 41-630

Just seeing if there's something better out there before i put em in.

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i got those same plugs in my cutty and it runs pretty good




WHAT EVER YOU DO


DONT BUY BOSH PLUGS OR PLATINUMS

Ive always read .60 for factory HEI

Originally posted by Eighty Six@Sep 5 2005, 12:32 AM~3754150
Ive always read .60 for factory HEI

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right, that's what i'd like to figure out.

Originally posted by Eighty Six@Sep 5 2005, 04:32 AM~3754150
Ive always read .60 for factory HEI

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.060

Originally posted by Foompla@Sep 5 2005, 10:21 AM~3754873
.060

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You know what I meant, you cant gap a fucking spark plug over a half inch

:biggrin:

.035" or .060" ?? that's a pretty big difference still

Go with a AC Delco plug, your part store will tell you the exact gap for your vehicle on these plugs. On my 87' cutlass with a 307 I gapped at .045

I found it in a Haynes book, every 307 from 81-87 uses .045 gap

Really you can gap plugs more or less than spec, if you gapped it more you could probably get a little better mileage, the HEI should be strong enough... but .045 is whats in the book

and it has 'R45TS' for the plug unless the engine sticker says use another # then use that one

Thanks man. Just for reference, what page did you find that on?

Plugs that i got from autozone seem to be around .060" already. So basiacally they should be somewhere between .035 and .060, :uh:

Its in chapter one 'routine maintenance' page 1-4 its an older book though...

To answer your first question, AC-Delcos are the best plugs...

If this is a tune up youre doing and you already replaced the cap, coil & rotor you can gap them wider than stock without a problem because your ignition system will be strong. Up to you though, what I would do is make sure I have the right # plugs first, then do .055 assuming you already went through the ignition recently, if not, then .045 and call it a day

Gapping at less than spec. hurts gas mileage and plugs foul more often

Yeah i think i'll just put them to .055". I'm replacing cap and rotor, p;ugs, wires, and all other maintenance items at once. Not sure how long the coil has been in but i haven't had any problems from it yet.

I got the ac delco #41-630 plugs

You should just replace the coil too while youre in there

its ACDelco pn# D505A

Being that you have a HEI Dist, .045 to .060 would be fine. Over-gapping would cause a misfire at higher engine speeds...where as a small gap would be just the opp.

John

Originally posted by Eighty Six@Sep 7 2005, 01:11 AM~3767326
You should just replace the coil too while youre in there

its ACDelco pn# D505A

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Why? It's not a maintenance thing and the one is there works.

I've got delco r45ts gapped at .035


they have alot of other ones though...r44ts r45t...ect

just heat ranges.

Try the r45ts and see how that works for your engine. If you have problems, switch heat ranges.