416 W2 on the dyno w/cam swap

The rundown: 360 block circa 1977 4" Eagle 4340, Scat I-beams, Icon 745 pistons, Custom Comp roller 246/244 .050" 660"/660" 106, Scorpion hydraulic lifters, Rollmaster timing chain, W2 closed chambers heads 60cc flow 292-298 cfm @ .600-650" Eddy Victor 340 W2, 830 Holley annular .5" open spacer and the only headers I had to test with-Schoenfeld 1 5/8-1 3/4" in the LA exhaust pattern!

Unspoken power goals were 600hp and 550+ft/lbs on 91 pump fuel.

So after the intial fire up and abbreiviated pulls all looked good after an inspection under the valve covers. While I did not have a provision to measure manifold vaccuum I am sure it was 5-6" as it had a very rough idle. Pulls were made from 3500-6200rpm. I am fairly certain the large mismatch created by the LA style headers and the smallish size corked up a small amount of power. How much power? Who knows?

All testing was done with Esso 91 pump fuel (probably winter blend-yuck) at 36 total timing locked out. After several pulls in the 570+hp range it was apparent that 600+hp wasn't about to show up without some work. I really wasn't too thrilled with the poor idle quality considering I have this engine sold to a street bound customer I was worried about true driveability. I started to think at this point that maybe a cam swap was in order. Upon intake manifold removal and lifter removal I discovered a collapsed lifter on the #4 intake-OK that would hurt power some I would imagine. At this point the engine is getting new lifters and a different cam but not a custom cam. I decided to use a Lunati VooDoo 243/251 grind which would bring the valve lift into a more steet friendly range and with the 110 LSA should bolster idle vaccuum and driveability. Here are some pics-'cuz it happened. J.Rob