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Compression on 454bs

I

ibanez540r

Contributing Member
"Hopefully I get some quick an

"Hopefully I get some quick answers, I'm on my boat now on the marina's new WIFI :)

What is the compression suppose to be on 1990 Crusader 454 big blocks (350hp)?

What would be considered low and problematic?


I've just done cold compression test with PORT being 125-130psi and Starboard at 115-125psi"
 
"I have always been told Mike

"I have always been told Mike that a cylinder pressure at 100lbs or lower is considered a dead cylinder...I believe mine, a 1992 454, are around 155-160"
 
Those are fine Mike.

The nu

Those are fine Mike.

The number that represents trouble is any one below 100 psi. The other form of trouble is when the variation goes below 70% of the maximum value. (these are from a service bulletin and reflect GM's 'opinion'.)


Doing it cold is also the preferred approach now.
 
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