Compression numbers?

[molder3]

Hey guys i found a used motor to put in my car, it has 58k miles on it and the guy said the comp #s were 148-151 with the throttle closed. Are those #s normal or are they a bit low?

 

[TxCobrA98]

umm sound kind of low honestly but they are all really close together. you want numbers that are grouped together. if you have like 7 cylinders showing 180 and the 8th showing 150, you got some problems lol.

but even that being said, it seems like 148 is a bit low to me? ive rebuilt my cobra's motor with fully forged interansl by myself but I am still not positive of what a "low" compression number is so maybe someone with some more expertise could chime in for you.

 

[molder3]

Ya thats what I told him is the numbers seemed kinda low, but he told me the numbers closed throttle are always lower. So idk. I just wish i had a place to do my own work, then i'd just rebuild my motor, way to expensive to have someone else do it.

 

[duff daddy]

Teksids are pretty pickey sO just BECAREFUL check, double check, tripple check, spec's tolerances, and remember aluminum will distort/expand MORE then an iron block

 

[vermilion]

you can get a block prepped warm, cool it down and it will still be different then last spec'd. remember that.