quote:Originally posted by SIG:
From the photo you can see that the manifold cross section does not fit well with the head. There is not enough wall thickness to grind the manifold to the size of the heads.
Brgds
Hartwig
That is the design of the intake. The spider IS NOT the original designed intake for the heads. The Torker style is.
I had the B351 heads as well, and actually the spider manifold was made for them. That is the shape of those ports.
Also, the A3 is the first of the aluminum "high port" heads in this series.
Lots of development has been done off of the original A3 heads but that comes about due to the different requirements of RACING.
None of these are "street heads". Some can be used in street applications. Maybe the A3 are the best examples of that?
