Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Blown bbc too much crankace pressure
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Old 08-12-2012, 10:24 AM
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Quote:
Originally Posted by johnaiello View Post
First Thanks for the response.
Rings are all in correct, I assembled the motor, it has Manley stainless steel valves. Block was done at a very reputable shop. 95 lbs is what I have researched to be the correct compression reading with 114 lobe separation.The bore is stock 4.25, original forged aluminum pistons 8.75 compression. Sealed power E233K Moly rings. Harland sharp stud girdle. I took it to the strip and it ran bad too lean, I broke the #7 exhaust valve. I replaced the spring and I don't have a leak down tester but left the compression tester on each cylinder for at least 1/2 hour no loss of pressure.
Thanks For the help.
John
I can tell you a stock bore block once the heads are bolted on that 454 block distort alot and if you getting blowby I can see why. OEM block are frail compared to a Dart block.

Go over this link and you can see what I am talking. Putting boost pressure to the cylinders amplifies the poor block prep.

http://www.camaros.net/forums/showthread.php?t=58964
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