For some manifold R&D , and comparison to my current intake with the spacer inserts I had Paul Swartz make for me. This is a 7" long runner:
The old manifold could use a shorter runner, and I figured the best way to get there, other than cutting the plenum off shortening the runners and then weld it back on was to lower the floor. To lower the floor the outside of the plenum needed to be built up quite a bit:
After the build up was done it was get to milling down the floor:
Still another .185" to go from where the quarters are sitting:
The runners in this old manifold are approx 2.7" x 1.9" = 5.13 sq in. They're going to be opened up to about 5.8"
After two weekends of playing on the old Bridgeport this is where it finished up this evening :
I have some thought to give it in finishing off the intake runner entry shape. Mummert will be involved in that and the end result.
