Is it REAL? Keith Craft takes the Challenge! The Results

[rdorman]

Hmmmmmmmmmmmm Keith does Clevelands!

Me so happy....

Not looking to rebuild an already fresh motor Keith (when I do, your phone will ring) but perhaps you can help a guy out here.

I would like a few more ponies out of my motor....... as inexpensively as possible of course. Motor was lovingly balanced and blueprinted by Duffy Motorsports in AZ.

Want to get a bit more power out of my Cleveland. The engine is a 40 over, balanced and blueprinted, keith black flat top pistons about 9.3 to 1, ARP bolts throughout (builder says 6500 conservitive limit for bottom end reliability), performer 4V intake (nothing has been matched, 4V open chamber heads, stock stroke/bore, arizona exhaust pipes (1 7/8" ID), 670 holley, 1" four hole spacer, 38 degrees timing with Unilite dist. and MSD box, cam specs
CAMSHAFT SPECS (From label on cam box)
Effective @ .050 Lift
VALVE Intake Exhuast Intake Exhuast
Lift (net) .510 .536 --- ---
Duration* 292 302 214 224
Opens 34 83 0
BTC 49
BBC
Closes 78 39 34
ABC -5
ATC
Overlap 73 Timing is net

On the dyno the car was running very lean. I beleive that is was because the intake manifold gaskets where sucking air and oil from the lifter valley. It was very obvious when I changed the gaskets. Air/fuel has been corrected as well. The car made 323HP and 354 torque to the rear wheels through a toploader and jag rear. Torque curve was very broad and peaked at about 3500. About 90% of peak from 2000ish all the way up to about 5600.

HP peakes at about 5300 where it remained the same until 6100. By 6500it was down almost 50HP.

The dyno numbers where before the intake gasket, 670 carb (run with a 600), MSD and four hole spacer.

Thanks in advance oh builder of power!

Rick