Well I was successful in getting one of the two engines in question back together and on the dyno. I discovered a cracked crank in the one engine so I am waiting on Callies to whittle up a crank for the block on the stand. Anyways, I went ahead with the AFR 385's with Inconel valves and hard anodizing options. These heads are nice I must say. I was able to CNC some custom intake spacers to make the ported 2897 intake and heads play nice. I had some pushrod clearance issues due to the super tall deck and a few other minor snags but all in all I am quite pleased with the result.
A little background on the previous combo: Dart Big Chief heads,Jesel shaft rocker, 11-1 comp, Dart T-Ram 1050 Dominators x 2, and with the original dyno sheet in hand, an observed 890 Hp @ 6000 rpm with 900 ft/lbs was produced.
I went to AFR 385 conventional heads, Edelbrock SV 632, Holley 1250 HP, Scorpion stud mounted rockers. Moving from the small chamber of the Big Chiefs to the much larger 124cc chamber of the AFR's dropped the static comp ratio from 11-1 to a boat friendly 9.2
The competing shop told the customer "It couldn't be done with a conventional head" At this point with two broken engines and very little run time, the customer was willing to trade some power for reliability and longevity. I think the end result is right on target.
On the SF-902 running Esso 91 pump gas, and blowing through some way small 2" headers 854 hp @ 5400 rpm and 898 ft/lbs @ 4700rpm.
A few pulls earlier with timing way back I observed peak torque @ 4400 rpm--right now the dyno will not load lower than 4700 rpm. I believe 920-925 ft/lbs may show up. I also have 3 more degress timing to try and more jet to throw at it. Not sure how much the small headers are holding it back but I may never know and don't really care at this point. Just thought I'd share this somewhat unique combo because I'm not sure if anyone has used this cylinder head on this many cubes before. Oh and I have to say my hat is off to AFR-the heads delivered. J.Rob
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