Reply to "BLUE THUNDER INTAKE SPECS???"

I didn't know you already owned a manifold.

The BT manifold will fit under the "raised" L model engine screen with no issues. It may take a bit of "thinking" to get it under a Pre-L screen.

In terms of performance, Mr. Boghosian should be able to relate to the fact that the BT manifold originally went on sale in 1970, under the Shelby name. It is a typical "large port" dual plane manifold. The use of such manifolds petered-out in the 1980s, but in their day they were popular in road racing applications (wide power band).

Just keep the camshaft overlap low (55 degrees based on seated valve events), use a 750 cfm carb, set the dynamic compression to around 7.7:1 to 8.0:1.

If you want the manifold to be competitive with single plane manifolds on the dyno the exhaust heat cross-over must be blocked. Comparisons without blocking the exhaust heat cross-over are apples and oranges ... invalid. Intentionally invalid in my opinion. Block the exhaust heat and watch the BT manifold perform! Also agreed with you that 450 bhp is easy to obtain. A good engine builder should be able to build the engine to produce more BHP than you expect. If you want to challenge him, set a high intake manifold vacuum goal, like 17" of mercury vacuum. that will throw a wrinkle into the project.

Your engine builder is welcome to call the office if I can be of assistance.

-G