cylinder base gasket .25 or .50mm after head work

[gorskined]

i just got my 76 row turbo heads back from the machine shop the motor is pretty much stock running sc cams carrera tensioners with a half bay andile long neck intercooler. european high flow headers and a ss steel exhaust with a k-27 7200 turbo .
SO it took the machine shop two cuts to get the heads perfect. they removed .25 mm taking the head down to the min 84.25mm ..
what should i do ???
i can simply use a .50 cylinder base gasket to compensate for the cut and this will bring my compression and piston height back to original. .
or
i would like to use the standard .025 mm base gaskets to add a little compression as the flat top piston comes about 1/4 inch from the top of the cylinders anyways from what i understand the 76 turbos are stupid low compression
like 6.5 to 1
if i use the .25mm gasket will this cause a valve clearance issue ????? or have i read to many performance books that don't apply to this engine ?
also if i do use the .25mm gasket will i have to machine .25mm off the cam chain housings or will the o-ring pick up the slack?
if i use the .25mm gasket what will the new compression ratio be ?

i posted this in the turbo forum also not sure if double posting is allowed if not let me know i will delete one of them

Thanks in advance
Regards Ned

[r lane]

Do the math on the compression, but I would guess a quarter to a half a point. Mock up one side and clay/solder check the valves. Would want .090 for the E and .060'' for the I. I don't know the early Turbos well, but doubt if there is a problem. Should be able to get away without out machining the chain housings, but again, mock it up and look at it. Make sure you have clearance where the cam comes through. Bob

[gorskined]

Originally Posted by r lane

Do the math on the compression, but I would guess a quarter to a half a point. Mock up one side and clay/solder check the valves. Would want .090 for the E and .060'' for the I. I don't know the early Turbos well, but doubt if there is a problem. Should be able to get away without out machining the chain housings, but again, mock it up and look at it. Make sure you have clearance where the cam comes through. Bob

Thanks i was planning on doing a mock up but was unsure about what measurements to look for .. much appreciated for the #s

Regards Ned

[cmcfaul]

I would go with the standard gasket and enjoy the extra compression. No way that would cause valve interference.

Chris

[pkabush]

Originally Posted by cmcfaul

I would go with the standard gasket and enjoy the extra compression. No way that would cause valve interference.

Chris

This ^
You’re correct about the low stock compression. It’s stupid low. Safe though,
given the fact that there’s no I/C

[pkabush]

Scratch that. I just reread your post and see that you’re running a I/C. I’d definitely bump up the compression.