Update on my 64 the 352 i had lined up fell through ive located another y-block but have some concerns im not against doing a rebuild i just want to know before making a offer. The one i found is a 292 block and rotating assembly. Seller says compression ranges from 70-90 across all 8 but my concern lies in that he says it has 239 heads on it. I still have the 292 heads and manifold off my old one as they were still good. Is there any benefit to the 239's should i leave it as is and run it? Or should i swap
SWAP!!!! Also consider re-ringing as those numbers are NOT very good!! If you're going to re-ring, you might consider AT LEAST new main seals, if not just going through it just to be sure it's OK. I hope you aren't considering any more than "core-value" for this motor??
70-90....no, not good. My 272 had 100 psi. across the board. No, do not run the 239 heads...tiny ports and valves.
What is considered acceptable cold compression for a Y block 292? The manual sez 130-170 psi at normal operating temperature.
if the mill has been setting and not running for a long period. Its possible that the compression numbers will come up after it is started and goes thru a few cycles. My advice forget the Y block. Find a Fe or a 351 winsor.
I wasnt gonna spend more than 200 on the motor expecting to go through it. Thanks for the advice on the heads and the rings i didnt even think about those numbers being low. I had an fe lined up and have a 351w sitting in the garage but id prefer to keep this a yblock truck. Ill let everyone know what happens with the new one
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