Blowers don't make sense since you need drives also. Was just curious what power was to be had at top end freshen up time in changing the heads....that's was all.

http://www.hardin-marine.com/p-26619...y-525-efi.aspx

Seems hard to believe that with that kit it will make 620hp ish. Think so???

I can see getting a nice power increase over those edelbrocks. How much, IDK. But, those edelbrocks do leave something to be desired, when comparing them to a Dart, Brodix, AFR, Canfield, RHS, etc.

Probably 310s, you agree?

Confused. You mean the 310 dart? Not sure what you asking lol

Lol. Yes, in the kit, probably a dart 310. You agree? I think the 325 maybe too big. Thoughts?

That would be my guess too. A 310 Dart is a nice fit for a 502 Marine engine imo.

Dart does make the replacement heads for the merc 525, 600/700sci engines.

http://www.dartheads.com/products/cy...nder-head.html

Yes, that is what's in that kit you cited. Just think with a redline of 6k on a 500 inch engine the 325 would be too big. That's why I assumed the kit had a 310 in it.

Just for reference, back in 2005 I had a pair of 565cid naturally aspirated engines with 315 Cnc'd AFR heads, a mild hydraulic roller on a 115* lobe seps, 950cfm Holley carb, 9.5:1 comp ratio,....

again,...little ol' 315 cnc'd AFR heads on some BIG AZZ 565cid engines...

...with the props I had the engines ran up to 5600rpm with full tanks of fuel in my 32' AT and would set you back in the seat when you pegged the throttles from 4000rpm....my buddy has a 32' AT with 556cid engines with 871 superchargers and he could not pull away/out accelerate me, or beat me at top RPM with his supercharged engines that made 750+hp.