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Originally Posted by AG

I'm building a 494 ci that is 4.32" x 4.21" stroke with SD CNC ported Eddy heart shaped chamber that flow 336 cfm, Bullet 235/241 at 0.50" HR cam, 0.632" lift, RPM intake with a 1" spacer and a 850 cfm carb, what do you think it will make?

My 4.350x4.21 Eddy heads maybe a click more porting Victor 850 Demon 268/272 solid roller made 690 HP. My 0.030 455 with a HFT 239/247 @ 0.050 Torker II 850 Holley is about 550-570 based on mph, conservative dyno was only 525.

So you should be in between.

FWIW the 455 on the street even on sticky DOT tires if you hit it in a turn it will break them loose real easy and you can get sideways!