Rskapof

What is it about the manifold that allows the engine to rev 1250 rpms higher? For the most part i would think this is limited completely to the valve train and fuel system.

ahddm

If you are going to modify your car enough to need a new Manifold you should have forged internals by then, JMO

russje

I'm sure with all the other FRPP stuff it'd be worth it. Like the CNC ported heads, and I'd guess they are designing a new cam to work better with this intake. Or maybe this intake works real well with the hot rod cams?

I would think, and this is a guess, that the valve train limits the revs more than anything. I've been to Milford on tours and when they do the endurance tests on motors they typically spin them well over 7000 rpms. I'm sure it's like running 500hp through a stock motor, it'll work, but for how long...

jdmcbride

Air flow is what is limiting the S197 OHC V8 motor from spinning to 7,000 RPMs. This new manifold flows more air which will allow it to spin faster. Cams would be a must-do with the intake manifold install.

Remember, this is not a pushrod engine that IS limited by the valve train at high RPMs (valve float). OHC engines usually have a higher redline because they can safely spin that fast - example BMW's 4.0 liter DOHC V8 that makes 414hp and spins to 8,300 RPMs.