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This is a new Longblock that is .060 over that I picked up for $500- any suggestions on getting more performance out of it. I think it might be a early 70's emission motor.
Any help much appreciated guys.
The BLOCk is '71 vintage, but what about internals?? Does it have flatops or are they dished '70's-'80's pistons?? Either way, you have the larger cc '73 to 80's heads. With flat tops it will put you in the 9.5:1 CR range. With dished about 8.2:1 given the overbore. If you had D0VE-C heads with flat tops then you would be 10.5:1+ CR. A stock '71 460 4V with D0VE heads would make the motor 365 gross hp. Your motor, with flat tops, otherwise stock I would estimate 295 net hp. With dished around 220 net hp estimating in the overbore.