[RatPwrd72]

Originally Posted by ptc

Straub is a great source of info... listen intently!

If you want to stay with iron heads why not go with the 990 rect ports? they will give you more RPM than the 049s if you go to a bigger cam.

Im running a 496 powerplant in my prop boat that is about 700 hp, the 990 heads, dual quad tunnel ram, port matched, Comp cam mech flat tappet cam, Crane valve train parts, SCAT and Crower rotating assembly. SRP pistons 10.25;1 CR on pump gas.

I get about 6900 rpm out of this engine, its instant on the hit and then runs out well. Thinking about the same build for my pro-street truck build.

The 990 heads are great for an all out drag motor or a high winding combo in a lighter weight vehicle. The runner size of the square port heads is way too big to make optimal torque in the "street" range, (2,500 - 5,500 RPM).

I've got a set of 990 heads that were ported by Reher-Morrison in the early 80's on top of a 13:5.1 468 engine with a Herbert solid roller that makes 730 HP at the crank with a single Holley on gas. Peak power is made at 6,800 rpm and it works great on the track, but wouldn't be much fun on the street.