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May 19, 2016 | 07:00 PM

froggys86

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Posts: 15

newbe

Does any one happen to know the right spark plug gap size on a v8 307 5.0 engine on a 86 Cutlass Supreme

May 19, 2016 | 11:26 PM

don71

same but different

Joined: Jun 2007

Posts: 2,965

From: Central Missouri

Spark plug gap for these models with the R46SX plug is pretty large at .080.

Personally, I would never go that big. .040-.045 is what I would suggest.

May 19, 2016 | 11:52 PM

froggys86

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Posts: 15

Quote:

Originally Posted by don71

Spark plug gap for these models with the R46SX plug is pretty large at .080.

Personally, I would never go that big. .040-.045 is what I would suggest.

Would .050 be to big of a gap...

May 20, 2016 | 12:50 AM

don71

same but different

Joined: Jun 2007

Posts: 2,965

From: Central Missouri

Well, yea in my opinion. Its too big.

May 20, 2016 | 05:06 AM

Rocketowner

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Joined: Feb 2013

Posts: 1,393

From: Tennessee

Welcome to C.O. I also saw where they said the gap was recommended .80, but It sounds too large to me . I 've gapped lots of plugs ,but none at .80. I would try them at .45. Larry

Last edited by Rocketowner; May 20, 2016 at 05:07 AM. Reason: Change word