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I've finally got all the parts for a PI swap on my 98 GT, but I am a little concerned because my motor already has 150K miles on it. I ran a compression test a while back and if I remember correctly, compression was about 130 on all cylinders. It also has a blown head gasket (I used man logic to justify replacing the entire top end since I'll be in there anyways :bigthumbsup).

Do you guys think I will be ok without rebuilding the bottom end?

edit: I'm pretty sure 130 is wrong, I'll have to re-check it tonight or tomorrow.
 

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I would if it were me and you can afford it....throw in some more performance while your ad it and it will feel like a new car again:gringreen Really depends on your cash situation!
 

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im planning on doing it this summer. im also using man logic... i cant beat a chevy impala, so im going to bump the horsepower a littlebit. lol. if your compression is bad now, i wouldnt do the swap though. your just begging for something to go wrong. however, if your compression ends up being within the tollerance, and you dont do a blower or No2, i wouldnt worry about it. my car has 85,000 miles on it and i was really worried about this too.
 

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oh, also. if you end up needing to to change rings, and your not going to run alot of boost in the future, you will be ok with stock internals.
 

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What does a repair manual say? Most I have read say 100psi minium, but if all the cylinders are close to each other then I think it's ok. My LS1 stock cranked out about 180psi, but that motor is 10.1:1 CR compared to your stock engine 9:1 CR.
 
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