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Originally Posted by JRider
(Post 4375983)
In my unprofessional opinion, forced induction would be a better way to more power than heads. Bang for buck a lot better but your XRs might not like them after a while. Or you can just leave it alone :cartman:
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Originally Posted by Pwraddr
(Post 4375933)
I see, thanks!
Wonder what kind of increase you could get changing the 525Efi head to the dart pro 1 310 head? Any guess? Or should the 325 head be better? |
Originally Posted by MILD THUNDER
(Post 4376001)
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Originally Posted by Pwraddr
(Post 4376006)
Seems hard to believe that with that kit it will make 620hp ish. Think so???
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Originally Posted by MILD THUNDER
(Post 4376009)
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.
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Originally Posted by Pwraddr
(Post 4376010)
Probably 310s, you agree?
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Originally Posted by MILD THUNDER
(Post 4376016)
Confused. You mean the 310 dart? Not sure what you asking lol
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Originally Posted by Pwraddr
(Post 4376019)
Lol. Yes, in the kit, probably a dart 310. You agree? I think the 325 maybe too big. Thoughts?
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.
Originally Posted by MILD THUNDER
(Post 4376020)
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 |
Originally Posted by horsepower1
(Post 4375920)
AFR 335's on a 540 in that rpm range are way too big. You'll never get any port velocity and if you're running a 1050 carb it makes things even worse. Only way to really make any power will be with a custom cam...short duration higher lift but that tends to be hard on valve train.
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. |
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