Advice on Cylinder Head cfm for 340 stroker

moparodbuster said
Yeah really. Victors, w2's, all high priced options on their own not to mention scrapping all my existing valve train, intake manifold, tti headers, etc. Not worth the cost and hassle when similar flow numbers are available from less expensive, standard valve train, standard intake, exhaust port heads. This all makes the Promaxx look like the best bet as long as I'm not restricting the engines potential by a huge amount. I'm just in the dark about what the noticable difference on my build would be between 285 and 300 cfm/intake... are those last 15 cfm only usable approaching my 7k rev limit or do they affect the entire rev range?

I’m lucky because my local shop is building a 360 with 4 inch arm and the CNC ported promaxx heads as we speak, it will be running a 600 lift roller cam. I could wait until it’s off the dyno and I could make some adjustments to my 340 stroker build based on how it works.
I was thinking of ordering the promax heads bare and putting a 205 valve in them and doing a bit of porting... I would like to see close to 300cfm flow out of them and try make 575hp with a solid lifter cam. If I can do that with the promax heads I will forget all about the trick flows.