vin0410- Here is the sketch that I made to determine the angles. What I wanted is minimum angles so that the hose sections would clamp well to the throttle bodies and to the inlet runners. I offset the the runner pipes to the right in the diagram 1/4 inch to reduce the angles. The distance from head to TB is 2 inches. I measured in cm the center of the throttle body assembly to the center of each individual throttle bodies. These numbers are at the top of the sketch. I put an arrow where I wanted the short pipes to end up. Then I drew in 2 inch pipes with 1/4 inch walls that ended up centered on the arrow at 2 inches. I could measure the angles directly from the sketch as raggedy as it is. The offset will be removed by porting the plastic so that there are no steps near the head. At the Throttle bodies the pipes will be ported to make them a little more round and open them up to near 2 inches. The 1.5 inch ID of the pipe can be opened up slightly to match the 42 mm butterfly diameter. More detail on request. The sketch was full size and showed only two of the four throttle body runners.
The original manifold uses standard bolts on my car with metal inserts in the plastic. Pics are earlier in the thread and in the Journal. I will use similar inserts. The o-ring gasket will be replaced by a paper gasket with RTV on both sides. This will insulate the manifold from the head. Fuel injection also cools this area.
john
