The SK manifold we used had a QJet flange. We used an open QJet to 4150 adapter and blended into top of runners. We did not open the runners as this intake is destined for a 303 build. wil start another thread, but the 303 is another very neat build using one of the original 303 blocks with rear mounted cam driven oil pump, 2.840" stroke forged crank and Carillo rods, Ram Air IV heads. Crank came out of the Tiny Lund shop.
Installed CL is 105
Played with lash years ago on this cam and we ran the best combo as this test was focused on heads and intake manifolds.
These tests solidified a cross section number we will use in future builds. Smaller faster more efficient ports is the trend ...knowing how small is too small is key. More flow thru the head and thru the entire intake tract does not allows result in more HP.
Example: The Offy intake manifold flowed the most air on the flow bench and on the running engine but it ended up at the low end of the Tq and HP numbers.
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Jim
www.raceV8s.com
1972 Trans Am drag car, 3300lbs, 468 ci, Iron D ports, 428 block, 9799103 crank, 9.48 @ 143mph, 6.0 @ 114mph in the 1/8th.
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