Spark plug reach

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Nov 6, 2013 | 02:01 PM

CAMS69

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Pro

Joined: Apr 2012

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From: USA

Spark plug reach

Funny observation I thought I'd share. I'm doing a 69 frame off resto. The po has a 350 with the edelbrock performer package on it. Heads , intake , carb , cam the works. While cleaning the engine for paint I pulled a plug out and peered into the head only to realize the plugs only went into the head half way! Seems the po was using to original head plugs with 7/16" reach instead of the 3/4" (iirc) correct ones. Makes me think that cool "camming out"sound may have not been all cam!

Nov 6, 2013 | 02:18 PM

REELAV8R

Le Mans Master

Joined: Apr 2011

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From: Hermosa

Well you just found a boost in performance. Right plugs and you'll have more compression and better flame propagation. Pretty funny though.

Nov 6, 2013 | 04:07 PM

Ironcross

Race Director

Joined: Nov 2002

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From: Taylor Michigan

350 or smwller V 8 Chevy engines do not use 3/4 reach plugs

I was going to condition my reply to OE heads

Last edited by Ironcross; Nov 6, 2013 at 07:38 PM.

Nov 6, 2013 | 04:45 PM

CAMS69

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These are edelbrock performer 6086 (iirc)
Aluminum heads and their reach is 3/4.

Nov 6, 2013 | 05:01 PM

REELAV8R

Le Mans Master

Joined: Apr 2011

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From: Hermosa

Quote:

Originally Posted by CAMS69

These are edelbrock performer 6086 (iirc)
Aluminum heads and their reach is 3/4.

Yep aluminum heads 3/4" reach.

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