compression height for cast LS1 pistons
#1
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Does anyone know the exact compression height of stock 00 LS1 pistions? Supposedly they were made by Mahle, but their piston catalog has some contradictory information. The CH number should be either 1.33" or 1.34". I'm trying to find cast flat top replacements, not many choices and they're all 1.328" CH, which Mahle says is a reduced compression piston.
#2
TECH Senior Member
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I have a feeling the 1.33 number you quote above is just 1.328 rounded upwards.
#4
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Also when I plug in the numbers, block height (9.24) - (stroke/2 + rod length) + deck clearance (.006-.008), I get about 1.34" for compression height, so I think that's right.
The difference in compression between 1.33 and 1.34 CH is not small, like 10.2 vs 10.5 with my numbers.
The difference in compression between 1.33 and 1.34 CH is not small, like 10.2 vs 10.5 with my numbers.
#5
TECH Senior Member
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Yeah .010 is a BIG difference, as you said. Does Mahle have a tech line to call?
Besides all that, give a call to WS6store. If anyone would have the piston you need, they will and at good prices accompanied by great service.
Besides all that, give a call to WS6store. If anyone would have the piston you need, they will and at good prices accompanied by great service.