It was a good day. Should be a great street/strip engine.
I'm sure in the bigger scope of things, this engine and it's power numbers are nothing very special compared to current standards. But I'm very happy so far.
582cid Dart BigM 4.600 x 4.375
Dart Pro1 345 heads w/CNC chambers @ 114cc
Chris Straub hyd roller degreed in straight up per the cam specs
Wilson Manifolds Merlin X 4150 intake w/CNC plenum cleanup
Pro Systems 4150 Nitrous IV carb 980cfm
GZ Motorsports VP104 vacuum pump pulling 11-12 inches through the pulls
93 octane pump gas (Chevron)
No nitrous
Belt driven water pump and alternator (installed, but not charging) during dyno pulls
First pull of the day was at 28 deg timing and carb jetted at 84/92 as received from Pro Systems.
735.4hp @ 6200rpm and 733.2tq @ 4700rpm.
By pull #7 we found what the engine liked. 36 deg timing and 88/96 jets.
807.3hp @ 6400rpm and 758.2tq @ 4400rpm (dyno pull was started at 4400rpm).
From 34 to 36 deg the gain was good, but not as strong as 28 to 30, 30 to 32, and 32 to 34 deg. So we felt that pushing the timing to 38 deg wasn't worth the risk of detonation.
Tried adding more fuel with 90/98 jets, but the engine didn't like it on the next two pulls.
Went back to 88/96 jets and backed up pull #7 with pull #10 which was the last run with the 4150 carb.
809.7hp @ 6600rpm and 758.6tq @ 4300rpm
We did try running the dyno owned 1050 Dominator and it didn't move the numbers much, if any. Airflow stayed basically the same as the 4150. Maybe with more time and some more tuning, the Dominator might have been worth some power, but it didn't look to be much.
The vacuum reading you see in the chart .5-1.8 is intake vacuum under the carb, so there may be some power to be had with a bigger carb.
For some reason the Super-Flow 901 was not wanting to pull the engine down below 4200rpm at the start of the pulls. I wonder what the peak torque numbers would have looked like at 4000rpm, or even lower?
Pull #10 sheets.
Pull #10
http://www.youtube.com/watch?v=ifLlXTxraK4&hd=1