i just did a compression test and i had very consitent results all averageing in the 155 range and max in the 170 range.
Are these good results for an engine with 133k on it.
Keep in mind i want to supercharge it

Thanks for the input
Brian

 

Rule of thumb is you should be 10% w/in your highest reading. I think on average for a stock engine you should be in about the 165 to 170psi range.
I wouldn't suggest supercharging your engine with that many miles.
JMHO

 

LT1's are ticking timebombs on boost. Some last for 2-3 years, some don't last 5 minutes. I've seen both.

IMO, I'd build the engine with at least rods and pistons before you supercharge. If not just go for the bottle.

 

I have been told a lot about supercharging in the last 3-4 months. I have not herd they are ticking time bombs though. I have herd that they are work horses and are built to last. I have also been told i would be fine to supercharge it if i run just a mere 8-9 psi a most on the stock pistons and high compression ratio. This is why i tested my compression today so i could find out if i should rebuild it first. However i know i must be carful with it and if blow it up i will just end up rebuilding it anyways.
Thanks again for the input
Brian

 

Sounds like you have done your homework and are doing things right. Most LT1s are fine to mod even well beyond 100K.
The numbers are relatively consistent which is good.
To me though the numbers look low maybe the cam in the b-bodies makes for higher cranking compression though as the stock LT1 in my Roadmater wagon cranked 190-200psi the couple times I checked just a few cylinders and that was over 170K on it. Cam differences gauge differences and testing procedures can all make a difference though so consisten readings within the same engine are the key.