427w small block ford rev potential

[Ant]

My 351w is a 9.2 deck Dart alloy block 4.125 bore 373 cuin, 6.2" carrillos, Yates heads, engine custom built by Keith Craft runs on premium pump gas, 8000 rpm at 675bhp.

When I received the engine we dynoed it and decided to change the inlet manifold due to epoxy in the runners and NZ pump fuel compatibility, I purchased a small port 2960 edelbrock manifold to replace the balls out job, Lost (1bhp) at 7000rpm and gained 25bhp at 4000rpm plus lowered the peak torque by 500rpm down to 5000rpm. There is no point now in going over 7000rpm and even at 6000rpm I have over 600bhp.

There was quite a bit of work to port match the new manifold, and I had to cut the valley plate out as I wanted to keep the removable Penske valley cover, so I can change cam lifters etc.

I would imagine when I am road racing there will be no need to go over 6500rpm, it will be more important to get the car handling to put all this power down.