RAMM
Well-Known Member
This was a pretty cool engine to test for a pretty cool guy-Andre Moreau. He runs a Stude @ Bonneville powered by an early Hemi. This Poly of his is slated for his Monaco for some fun and reliable cruising on the street. What was really nice about this dyno session was testing the engine with an old Weiand dual plane manifold first and then getting some quantitative results on this new manifold (SuperPac) that was just released.
Poly Specs:
4.00" x 3.79" for 381 cubes
9.0-1 comp (pumpgas)
ported Poly heads with stock valve head diameter but 11/32" stems(very nice looking work
.510" 236 @ .050" 108 LSA solid CamCraft camshaft
QFT 780 VS
TTI 1 3/4" coated headers
This engine ran beautiful with very nice mannerisms. Stable idle with a little lope, starts well and shuts down without protest. Best total timing was surprisingly found to be 30 and best power occurred by stepping the primary jetting way down from 74 to 68.
The Weiand did well with 387hp and a pretty stout 435 ft/lbs. He was happy with that and really wanted to see what the new manifold could do. Off came the Weiand and surprisingly the gaskets didn't tear so the new manifold went on and we were up and running in about 35 minutes. The new manifold didn't disappoint with a wall to wall torque gain which translated to a best of 409 hp and 470+ft/lbs! Plus the new manifold looks pretty trick too. It is always a blast to test when the engine runs as nice as this one. I took a few pics for any Poly fan. J.Rob
Poly Specs:
4.00" x 3.79" for 381 cubes
9.0-1 comp (pumpgas)
ported Poly heads with stock valve head diameter but 11/32" stems(very nice looking work
.510" 236 @ .050" 108 LSA solid CamCraft camshaft
QFT 780 VS
TTI 1 3/4" coated headers
This engine ran beautiful with very nice mannerisms. Stable idle with a little lope, starts well and shuts down without protest. Best total timing was surprisingly found to be 30 and best power occurred by stepping the primary jetting way down from 74 to 68.
The Weiand did well with 387hp and a pretty stout 435 ft/lbs. He was happy with that and really wanted to see what the new manifold could do. Off came the Weiand and surprisingly the gaskets didn't tear so the new manifold went on and we were up and running in about 35 minutes. The new manifold didn't disappoint with a wall to wall torque gain which translated to a best of 409 hp and 470+ft/lbs! Plus the new manifold looks pretty trick too. It is always a blast to test when the engine runs as nice as this one. I took a few pics for any Poly fan. J.Rob