How to lower compression???'s

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Built6spdMCSS

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All this talk of switching parts and I'm the first to suggest drilling holes in the Pistons..

Neil Degrasse Tyson GIF
 
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Streetbu

Know it all, that doesn't
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All this talk of switching parts and I'm the first to suggest drilling holes in the Pistons..

Neil Degrasse Tyson GIF
Yes but he'd need a good catch can setup on the valve covers... 🤣
 
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Clone TIE Pilot

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Aug 14, 2011
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You can also retard the cam a little to bleed
If you added another .010” head gasket and cleaned 2 cc out of the heads, that would drop you into the mid to upper 12’s for static. Mill .020 of the pistons would drop another .3-.4 as well (or somewhere near that.)

Thicker headgaskets increases detonation due to poorer quench. Best to either mill or swap the pistons. Perhaps a tamer cam too.
 
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64nailhead

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You can also retard the cam a little to bleed


Thicker headgaskets increases detonation due to poorer quench. Best to either mill or swap the pistons. Perhaps a tamer cam too.
To a point I agree. If he’s running a standard Felpro at .038-.040 and zero decked, then he can get away with .050-055. Going to .080-.100 will cause major issues and .060-.065 won’t help his cause either. But if his pistons are .020 in the hole then he needs to stick with .030-.040 thick head gasket as a maximum thickness.

Most of this comes down to the OP. There are going to be times that he has to pay close attention to sound, performance and temps, and perhaps hang out waiting for it to cool off. . If he lets his woman drive it like a it’s a Toyota Rav 4 then it’s destined to be blown up. It won’t take 20 minutes of ignorance.

And he doesn’t need less cam imo. I’d tell him to put all of the cam in it that he can stomach around town. As Shawn mentioned, he needs to bleed all of the compression he can.
 
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64nailhead

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Yea less Cam raises dynamic.. so there's that.
Just makes the tune tougher to keep a handle on. Moving the cam about doesn’t help Bo Diddley if it’s too small. He needs to keep the cylinder pressure low below 3000rpms.
 
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