Quote:
Originally Posted by Fred68
The only other way is making a good manifold your self.
The primaries want to match the ID of the exhaust ports and be as close to 30" long as possible before the collectors. The bends need be smooth and mandrel formed. The collectors need to be 1 over 2 and correctly welded so as not to impede gas flow. The secondaries need to be around 2" ID and be approximately half the length of the primaries. These then need to collect into a 2 1/2 free flowing system.
It's possible to build up a much better set of manifolds than the JS version.
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If only I were able to make such a thing!
It's a shame there was never a performance replacement for the entire plenum (apart from the Sprintex supercharger plenum).
The normal plenum really doesn't look like it would flow well. And we all know how well designed and reliable the VIS system is don't we?
Theoretically, I expect with the exhaust manifold you described and an optimal plenum, the KV6 would have performed much better.