piston to valve clearance question ---> need help
12-13-2008, 05:52 PM
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piston to valve clearance question ---> need help hello guys
actually i just got my 215 TFS 64cc for my forged bottom ls1 5.7L
my cam shaft : 235/239 .621/.624 114 LSA
stroke : 3.622"
piston valve relife : -2 ----> diamond flat top
gasket thikness " .040" ----> cometic
and i'm thinking to mill my 64cc cylinder heads to spec. 60cc chamber volume
so that's will raise compression ratio from 10.63:1 up to 11.18:1
and i think this increasment shouldn't be a problem with tuning in 95 gas pump
so the only thing that i'm really worry about it is the piston to valve clearance .
so guys did any body run somthing like that b4 ???
any suggestions will be appreciated
thanks
actually i just got my 215 TFS 64cc for my forged bottom ls1 5.7L
my cam shaft : 235/239 .621/.624 114 LSA
stroke : 3.622"
piston valve relife : -2 ----> diamond flat top
gasket thikness " .040" ----> cometic
and i'm thinking to mill my 64cc cylinder heads to spec. 60cc chamber volume
so that's will raise compression ratio from 10.63:1 up to 11.18:1
and i think this increasment shouldn't be a problem with tuning in 95 gas pump
so the only thing that i'm really worry about it is the piston to valve clearance .
so guys did any body run somthing like that b4 ???
any suggestions will be appreciated
thanks
Last edited by alharbi; 12-13-2008 at 06:25 PM.
12-13-2008, 06:19 PM
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I have a similar setup.
232/236 cam, -2cc diamond pistons, 57cc 5.3L heads, .040 gaskets.
I measured PTVC and wound up with close the minumum safe clearances of .080/.100.
You should be OK, but be sure to measure just in case.
232/236 cam, -2cc diamond pistons, 57cc 5.3L heads, .040 gaskets.
I measured PTVC and wound up with close the minumum safe clearances of .080/.100.
You should be OK, but be sure to measure just in case.
12-13-2008, 06:21 PM
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ohh really
if i may ask , how did you know that ?
so i thik i shouldn't worry about that
coz as i know that The intake valve must have at least .100? clearance to the piston and at least .120? clearance on the exhaust valve.
am i right ?
if i may ask , how did you know that ?
so i thik i shouldn't worry about that
coz as i know that The intake valve must have at least .100? clearance to the piston and at least .120? clearance on the exhaust valve.
am i right ?
12-13-2008, 06:27 PM
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2cc is that size on most pistons, if you look at the manufactuers spec it tells you the depth. For the diamond flat tops its .165 inatke/.107 exhaust
.080 intake/.100 exhaust is the minimum clearances you are looking for.
