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1G Headgasket size please help

YungTlon

Proven Member
102
10
Mar 6, 2018
Pueblo, Colorado
Alright gurus I will be posting this with a little more info this time hoping for a answer with the Newley provided information, I tried posting on tuners but no hits. So I’m still trying to figure out the right headgasket size.
My head is reading about
5.190”
And my pistons sit about 5-7 thousandths above deck. I wish I had a dead nuts number for that but by no means am I very good at using the dial Indicator. And I will be running a gsc s3 with a peak lift of 11.70mm. This is how I was thinking but got lost.
factory heads measure at 5.200”
Mine reading 5.190” has about 10 thou taken off. Factory headgasket size is .051”
With the pistons sticking 7 though above deck that’ll be .051-.007” that’ll leave a quench of .041”? But then I got super lost when I brought the cams into the picture. Any input would help, thanks!
 

donniekak

DSM Wiseman
5,620
960
Mar 23, 2008
Surprise, Arizona
Unless you have flat top pistons you aren't going to get a real quench.

Do a mock up assembly and clay the pistons to measure piston to valve clearance.
 

jed344

Supporting VIP
1,147
242
Jan 10, 2008
Waterville, Iowa
I always do the math on quench area but he is correct unless pistons are flat its not truly quench area. I would clay pistons to make sure on valve clearance only way to know for sure, with those cams and a head decked that much plus a block decked enough to have positive protrusion like that you may end up tight on valve to piston clearance on stock thickness gasket.
 
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