Quote:
Originally Posted by Gregski
TThe Greg had a Weiand intake manifold already and was very dissatisfied with the machining...
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I've had four of them over the years, the first probably made in the USA in the early 90s. What a concept! The next two were machined OK, but had rough castings. The last one is an 8121 Vortec manifold I have on my truck's 355. It has a very nice casting.
I like the the Weiand 812x series because they have more modern ports than comparable Edelbrock Performer and EPS. But the Edelbrocks do have nicer, or at least more consistent, castings for sure. Hard to beat that 7101 Performer RPM in a 350-406. It's possibly the best aftermarket small block manifold ever made.
As for head gaskets, yes, a .028" composition gasket would raise compression a little (approx 0.3) and lower the quench height. But I don't know if any gains would be worth the cost and effort.