A lot of the BBC chevelle guys are runnign AFR heads with fantastic results. I have 335's on my 540 just to reduce the low end torque a little for more driveabilty but it still made 525ft-lbs at 3000RPM. It ended up making 680ft-lbs at about 5500 and 750HP at 6800. With the solid roller I spin it to 7500RPM easily.
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