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My 499 combo with large port heads, flowing about 310 unported went 9.30s at 3000 lbs. 12.5/1 compression, Methanol for fuel. Shifted it at 6800. You should be able to run the same shift points, and the 4.88 might be a touch on the high side. With rollout of 103, 6 percent slip, I come up with 7400 rpm through the traps at 140 mph. 7200 at 136 mph. So it should be real close on the gear, might need to drop to a 4.56 or 4.30. Ask your engine builder how many rpms he wants to see in the lights. If you have room, there are some slicks out there that go 106 roll out, would put you into a situation where you have lots of fresh tire, no gear change to do. A tire that will grow some in the lights like those with the 106 roll out will bring you down to 7100 rpm at 140, with 6 percent slip.



is this a stock block or race block combo????? its a bad azz running combo... thanks

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