Get a 1985-93 roller cam block(that way you can use less costly stock roller lifters). Buy a 383 Scat crank(3.75" stroke), an 18cc dish piston, 5.7 rods,(6.0 rods to get internal balance) 4.166 bore gasket .039" thick, and a zero deck, the 64cc heads would make for about 9.6:1 static comp. ratio. Use a Comp Cams XR264HR roller cam(1200-5200rpm) for a good throttle response and good torque off 650rpm idle and a Dynamic CR of 8.0:1(87 octane freindly)
Cam Quest software says w/750cfm carb and dual plane intake about 433HP and 485flbs. Quite a bit optomistic I believe.
A 12cc piston would raise the CR to 10.25:1(all other factors identicle). Can get finicky on pump gas, but manageable with alum. heads, good tuning, cold air intake and 91 octane. With a slightly larger cam to keep the DCR similar(8.28:1) Cam Quest software says with a XR276HR cam 456HP and 480 flbs. Again quite a bit optomistic I believe. The specs for the 276 cam state 1900-5600.
I admit both cams may be too mild for many, but it is a fairly heavy truck and that means its gonna need some torque down low to get going.JMHO
Last edited by ssmonty; 03-01-2013 at 06:34 PM.