Offshoreonly.com - Air Flow Research Heads

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- - Air Flow Research Heads (https://www.offshoreonly.com/forums/general-q/84639-air-flow-research-heads.html)

zt260

08-06-2004 08:28 PM

Re: Air Flow Research Heads

So has anyone used the stock 454 mag closed cooling system with a 540?

Vinny, I think your concerns with rev valves have been answered. If OSO members haven't done it no one has.

Vinny P

08-06-2004 09:00 PM

Re: Air Flow Research Heads

Dave,
You're right. There is a wealth of knowledge here. Someone here has done just about anything you can think of. I am leaning toward going with the 315 cnc heads. On my desktop dyno, they will make 670 h.p.@ 5500 and 685 ft lbs torque @ 4500. That's good enough for me.

What's the benefit to having the water passages " Hard Anodized "? I assume it will delay the corrosion process of salt water..

Also what's the advantage of copper berrylium seats?

KAAMA

08-06-2004 09:09 PM

Re: Air Flow Research Heads

Monty,

Could you post the exhaust flow numbers on your heads too please? It looks like the AFR heads to a really nice jump in the flow numbers with the Del West valves. Is there supposed to be anything special about the Del West valves that causes the AFR heads to flow better?

KAAMA

08-06-2004 10:13 PM

Re: Air Flow Research Heads

Quote:

Originally Posted by CigaretteFirefox

...I ordered a brand new set of Dart Merlin heads From AFR...

CigFirefox, Not picking on you, but is this a mistake?

paradigm shift

08-06-2004 10:19 PM

Re: Air Flow Research Heads

Quote:

Originally Posted by zt260

So has anyone used the stock 454 mag closed cooling system with a 540?

Vinny, I think your concerns with rev valves have been answered. If OSO members haven't done it no one has.

I saw that too and no I have not but I would think that heat exchanger would be a little small for a 540. Cooler thermostat will not help on MAX heat load on system.

Comanche3Six

08-07-2004 04:02 AM

Re: Air Flow Research Heads

Quote:

Originally Posted by KAAMA

CigFirefox, Not picking on you, but is this a mistake?

yes

Bob280Silencer

08-07-2004 09:58 AM

Re: Air Flow Research Heads

Vinny,I built a 548(9.7 cr,AFR 315,650hp,680 tq pulling all accessories & wet headers))My boat didn't come with a closed cooling system so I looked in the aftermarket.Mine works great.The heat exchanger is huge (4x32 inches)Call me at the shop Monday & I'll give you the name.1.504.486.7070 BOB

PatriYacht

08-07-2004 11:00 AM

Re: Air Flow Research Heads

Quote:

Originally Posted by RLW

If you want an indorsement in regards to REV Valves, Dean Nickerson is the person who clued me in on their existence. I would definitely go with the hard anodizing. It is a $189.00 upcharge.
My engine builder went with the AFR 305cc heads with the CNC'd chambers on my 9.2:1, Dart based 540. Manley valves. Cam is a Comp with 236/[email protected] duration, LSA is 112 and valve lift is .630/.635. 1050 Nickerson carb with a single plane Merlin intake.
706 hp@5400 rpm and 700 ft/lbs@5000 rpm on the dyno.
Hope this helps.
Russ

RLW, do you remember the cam pt. number? I'm not happy with the one I'm using, Crane 651. Thanks.

Vinny P

08-07-2004 11:05 AM

Re: Air Flow Research Heads

Bob280,

Thanks for the help. I will call Monday. Or if you can, just P.M. me the information.

Vinny

RLW	08-07-2004 11:56 AM

Re: Air Flow Research Heads

Patriyacht,
I have the cam information at home.
I will get it to you.
Russ

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