Join Date: Sep 2000
Location: Shrewsbury, MA, USA
I used an XS282S profile which is a solid tappet design with durations of 282/290 (244/252 @ .050)lifts of .520/.540 and a 110 separation angle in DD2000 with a single plane manifold and a 750 CFM carb and large tube headers thru mufflers and came up with a peak HP of 345HP at 5000 RPM and peak torque of 402 ft-lbs at 4000 RPM. It's a very peaky torque and HP curve in that it starts at 126/330 (HP/ft-lbs) at 2000 RPM runs up to the peaks and comes right back down ending up at 222/166 (HP/ft-lbs) at 7000 RPM.
This is a 2800 to 5500 RPM engine, it's going to idle rough with very little idle vacuum. This cam is going to need a 3000 plus torque converter, and you could probably use a little more compression ratio. Dual plane takes both HP and Torque away. Carb size doesn't change anything more than a couple of HP from 600 CFM thru 800 CFM.
1969 Indy Pace Car
350/300HP RPO Z11
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