Thread: Too much head?

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I don't think you can get to much head ether! To answer his question How moch head you use depends on how high you want the power band to be . Even a 302 needs a good flowing set of heads at 9000 RPM.

For a street engine without RPMs going past 5500-6000.

OK, here's a nice little 375hp 283 street motor with hydraulic cam that would work well with a stock converter.

Assuming that is would be possible to cut the L31 decks for 60 cc's (about 0.028") without making a cracking problem, you could make 9.15:1 static compression ratio with flat-top 6cc pistons and a 0.035" squish. I remember reading years ago when these heads came out that it was not recommended to use a domed piston with them to raise static c.r. I wouldn't do it anyway because in my opinion, the dome gets in the way of flame propogation across the chamber.

283 bored 0.060" with flat-top, KB165 6cc pistons. Cut block decks to 9.015" for 0.010" piston deck height. Victor Reinz 5746 head gaskets, 4.100" bore, 0.025" compressed thickness for squish of 0.035". L31 heads with stock 1.94"/1.50" valves. Cut head decks 0.028"-0.030" for 60cc chambers, 9.15:1 static compression ratio. (598 cylinder, 60 head, 5.4 gasket, 2 deck, 6 piston).

1 3/4" long-tube, equal-length headers, RPM Vortec intake, 600 carb.

Compcams part number 12-230-2, grind number XE250H, 250/260, 206/212, 0.432"/0.444", installed 2 degrees retarded at 108/112/110.

RPM HP TQ
1500 85 300
2000 123 323
2500 158 332
3000 202 353
3500 249 374
4000 292 384
4500 329 384
5000 362 380
5500 374 358
6000 375 328
6500 354 286