Re: Dart vs AFR heads on HP 500
 

Here's a couple shots of my AFR's with the hard anodizing (black coating) on the stands as my engines were being assembled about a year ago. I thought the quality of how the hard anodizing was applied to the heads that AFR did looked so good that I decided not to paint them and leave them as they came...

Re: Dart vs AFR heads on HP 500
 

Kaama,
From your picture it appears that you have a different way of routing the water flow through your engine. Do you have any pictures showing it completed. I am interested in how you plumbed the water flow. Looks like you have one of those thermostat housings from Rex with the bypass valve/spring. Is that true, if so how has that worked out for you. I am thinking of using them on my engine. Currently running a crossover w/o thermostat and would like to build some heat w/o excessive water pressure.

Rick

Re: Dart vs AFR heads on HP 500
 

For this build, you will should consider an ignition upgrade as well. I have the same combo AFR 315, Crane 168741, 1.7 rockers on the exhaust and 1.8 on the intake, Stock 6200 Dart Intake and Holley Stock 800, HVH 1" Super Sucker carb spacer, CMI Elbow Tops...around 630hp. Look at the Crane Hi 6M ignition box(6000-6462) and LX92 coil (730-0892).

Dave

Re: Dart vs AFR heads on HP 500
 

Hi Mark, they look good in flat black. Your flow numbers are almost identical to mine even though I went to the AFR 335's. Mine average 290 ex. at .6 lift though. :D One of these days I'm going to build a pair of 632's and put these heads on them. I'm sure they flow well enough to support that many cubic inches at 5500 rpm's. Ian

Re: Dart vs AFR heads on HP 500
 

632 " ? I'd go Raptor 12 degree oval ports. LOL!!! freakin' expensive but a whole lot of fun 'oh schit' !!!

Just playin/dreamin/joking.... kind of.

[img] http://www.rehermorrison.com/images/Raptor-web-ad.jpg [/img]

Re: Dart vs AFR heads on HP 500
 

I find it interesting that AFR seems to do the machining after the hard anodizing.

On the Canfield heads, the anodizing is done after the machining (even after combustion chamber work and etc if you opt for that) - no exposed aluminum.

I'm no chemist or metallurgist. What's everyone's thoughts on the two methods ? Longevity ?

Re: Dart vs AFR heads on HP 500
 

Wow, those are cool! But how would they work in a recreational boating enviornment? And $$$$$. Maybe someday on an all out poker run boat.

Re: Dart vs AFR heads on HP 500
 

Ian,

Glad you posted. Just so that everyone knows---the EXHAUST port on AFR's 305, 315, 335, and 357cc heads are ALL THE EXACT SAME PORT!!! JimV enlarged your exhaust port size more than what he did on mine because I told him that I wanted him to try and maintain the strong mid lift numbers as much as I could without sacrificing them too much for the bigger flow numbers at .600" lift. I told him to try and do that without increasing the diameter of the port too much if he could so, that's why mine might be slightly lower flow numbers than yours. That just shows the potential of the AFR's and that JimV can get even MORE FLOW from the AFR's if the customer wants to such as in your case---which is a great thing!

Re: Dart vs AFR heads on HP 500
 

RV/Rick,

Probably the best way to show it is with the engines plumbed the way I run it in the boat. Until then this isn't too bad of a shot, but as you can see I use a CAM DRIVEN water pump which some people do not like because they don't seem to pump enough water at idle speeds. I have found this to be somewhat true...as the headers run a little warmer, but the engines still run fine with a 120* thermostat. I run about 18-22 pounds of water pressure while on plane and have no need of any high pressure relief valves. So far it is working well for me.

Maybe I can get a bit of a better/closer shot for you this weekend.

Re: Dart vs AFR heads on HP 500
 

who has the best pricing on the AFR 315