AFR Heads
 

Looking to buy heads for my new 540's, naturals. Has any body used AFR 325 cc heads 119cc out of the box. I'm told they work nice. Any thought's . Wanna make the right choice. Thanks JOHN

Site member rmbuilder/Bob Madara of Marine Kinetics would be a good guy to go to for info on AFR's. His phone number is 585-654-8583.

They look to be a nice head eventhough we have not used any YET. We mostly use the Dart Pro-1 out of the box non-CNC a really good basic head. As always you must consider the application and your goals for hp & tq.

I know several reputable engine builders who use the AFR's pretty much exclusively and they are really great cylinder heads. As a cylinder head manufacturer I can tell you that these are some of the best GEN 4-6 cylinder heads produced in the good old USA today. They are a little price'ier than some of the others, but you pretty much get what you pay for in cylinder heads. You've started your choice in the right place.

Regards,
Ray @ Raylar

Kinda depends on what you're looking to do.I used the 315 cnc on my 548. tq-677 at 3900,Made 670+ ft lbs from 3000 to 4200,hp 640 at 5400 pulling all acc. and wet headers.Rather mild cam.Mark set the comp. up. Very happy with it. BOB

Congrats....We just made dam near the same numbers on a 540 with ported Iron Eagle 308's. (699 TQ at 4,100, 628 HP at 5,100) Mark at Precision did my Dyno run, seawater pump to CMI's too. What compression are you running? I'm at 9.7 with "stock" looking 500EFI's.

Great Cylinder Head, makes lots of power. Make sure you order them with Hard Anodize coating and Inconel Valves .

I'm at 9.8 with JE forges pistons. .600 intake/.610 exh. Cam Motion cam. Since then I've had the intake extruned honed(polished not enlarged,stupid me!?)and added the AS&M mono blade.Would be courious to see if that helped but not enought to R & R the engine! lol BOB

I have a set of AFR 315 cnc on my NA 540. Made good power with a mild hydraulic roller cam. 680 hp @ 5800 rpm, 660 torque @ 4500 rpm.

Do some homework before you buy. I had had at least eight sets (16 heads) go across my flowbench. NONE of them came close to flowing what their advertised numbers on the exhaust side.