Maybe someone with a good desktop dyno can help me out with this. I would like to know what kind of power my drive train should make so here are the details. 350 .060 over,3.75 crank,5.7 rods internal balanced. Speedpro pistons dished 12cc. Perfect circle rings plasma top iron second. Comp from eagle was suppossed to be 9.6 to 1. The heads are DART iron eagle 215 plat. 2.055 manley race flo intake 1.60 Milidon Mega flow exhaust valves. Springs are comp 1.437 double comp locks,retainers,seals guideplates. Cam is comp extreme solid flattappet .520 intake lift .540 exhaust lift. Duration @.50 244 intake 252 exhaust.The lifters I am not sure of yet I have 1.5s and 1.6s so The one that works the best is what I would use. A geardrive timing set.THANK YOU  

I ment rockers Im notsure of. Holley strip dominator intake ported to match heads. carb 750 mechanical secondaries.All msd ignition 6al.th400 trans. TCI 3000 converter. 373s rear gear. I also have an adjustable N2o kit as well if I need it. Heads are also polished but not ported.  

i have a circle track car with close to the same specs my cams a little bigger mid 600  and comp. little more 13.5 but my engine dynoed at 617 flywheel  

Polished but not ported? I've never heard of such a thing. Why go to all that work for no gain?

May I ask why you used a mis-matched set of valves? I guess that it probably couldn't hurt as long as the installed heights were adjusted accordingly but it's just a little strange to see.

Power your drivetrain would make? So I assume you mean to the wheels, and that depends on the transmission, rear end gear ratio, tire size, etcetera.

Power at the wheels hasn't been standardized as well as power at the flywheel so my advice for RWHP is to have it measured and you can use that data to tune. For an estimate of flywheel horsepower I'd say your combination has the potential to make 450-475 horsepower, this is assuming a well-choosen carb and decent single plane manifold as well.  

The reason for not porting the heads is that Dart recommended just a polish job on there heads for my application. Hot street. Because of how the new runners are designed. They just needed to be polished help to speed up the intake charge and help with the exhaust exiting as well as possible.As far as using mismatched valves it was just for flow rates on the valves. The Milodon out flowed the Manley race flows on a flow bench. Well thats what my machine shop recommended. The valves were installed at the same height. The intake is a fully ported and polished Holley strip dominator. The carb I am flexible on what ever works better is what I will get evenually when budget allows it.  

That's the problem, I am totally convinced that polishing the intake runners would only slow down velocity and hurt wet-flow characteristics. People haven't been polishing intake ports for 35 years!

I guess before I make my claims I need to get your definition of "polishing." If you ran a 60 or 80-grit sanding roll through them that's a-okay with me, but if you used emery cloth or some very fine paper then it may have been a waste of time. Combustion chambers aren't even being polished to mirror finishes any longer, "matte" finishes are being used to better collect thin-films of carbon, but that's a whole different story...

But I don't need to argue with you about it, maybe just a heads up for next time around. There shouldn't be too much difference and you still have a good set of heads, I can't honestly change my flywheel horsepower estimate just because of a polished port.