New Engine Advice

Fred · #1 (**permalink**) 01-15-2002, 08:56 AM

Can anyone offer some advice?

The motor in my cobra is near death. I am going to install a new motor before spring and would appreciate a few recommendations. Present motor is a 5.0, 30 lb injectors, F303 cam, 15 psi intercooled procharger supercharger, 5 speed tranny. I will continue to use the supercharger and injection setup.

My big question is what would be a decent cylinder head? I will buy a short block and heads. I have been told because I am supercharged, a cylinder head with low volume intake runners is better as it will increase the low end torque. Once the engine revs, the supercharger will provide all the power I need. Then all I need to worry about is flow out the exhaust valves. Does this sound correct?

Fred

Roscoe · #2 (**permalink**) 01-15-2002, 10:01 AM

I would suggest you contact AFR and ask their tech guys.

http://www.airflowresearch.com/cyl.html

Roscoe

Curt C. · #3 (**permalink**) 01-18-2002, 02:53 PM

I run AFR 165's on a supercharged DSS 306 in a 95 mustang cobra. With only 4psi at the manifold, combo yields 390 rwhp. These heads are really nice. Fully cnc ported and very clean.

Fred · #4 (**permalink**) 01-21-2002, 08:04 AM

Roscoe, Curt,

I contacted AFR about their heads. They are recommending the 185 heads. The dyno sheet for the heads show I will loose some bottom end torque going with the 185 heads as opposed to the 165 heads. The flow numbers they give are impressive.

AFR is concerned that the 165 heads will flatten out on the flow around 5000 to 5500 rpm. The 185 will increase in flow past my redline of 6500. I am going to try and increase my peak rpm even more with the new motor.

I sent AFR a question regarding valve clearence and will order a set once they provide an answer. I will check the valve clearence before I run the engine, but I would like to be fairly sure before I purchase them.

Fred