Vk valiant 142 weiand project

To begin with i was using a single 4bbl manifold with an adaptor plate bolted to it. It was very low and restrictive and was much like an early factory 273 single plane intake. The car did run 117mph on the 1/4 with it but it had tiny runners and it was making 9 lbs of boost as measured from under the blower. Now we have the Indy ModMan LA manifold on it with a 1/2" adaptor plate and the boost dropped to 4lbs and the mph went up to 118.67 on the 1/4 with no other changes.Not very happy with Indy though they send this manifold half way around the world to me
Here in Australia and i get it out the box and its got a crack in the valley all the way along
between the runner pairs. Still trying to get a replacement out of them.