I was just wondering if anyone has flow data for a set of stock crae-r heads? It would be great to see data with stock valves and with large valves. And the same comparison with a port job with stock valves vs the large valve and port job.

thanks

 

Yes, can some of you Gurus' find this information out. I have a set as well and I would like to see the flow numbers as the previous poster requested?I know someone out there has put these heads on the flow bench?Can you share with us?

 

I have flowed a set of c6 ae-r heads with a little exhaust porting and came up with 208 cfm's @.550 and above. Porting the exhaust is needed high and wide. The horse power formula shows 429 HP ( HP=0.25714 x cfm x # cyl.) This is @ 28''.

 

Wow, talk about following up with a post. Nice work. Rep added

Do you happen to have the full flow data from all the lift points? Also are these stock valves? or larger? I have never heard of that formula before. Is that saying that those heads will max out at 429HP?

 

Stock 2.02/1.55 valves and yes I have a complete flow data sheet @28''. .50\22.85 .100\39.20 .200\120.87 .300\158.79 .400\199.08 .500\208.56 .600\208.56 This is corrected cfm.. This is the possible HP, depending on how you build the motor you can get more or less.( compression ratio, cam intake, porting, deck height of piston to block@ TDC., etc... Some people also figure HP @ 10'' Here are those #'s .50\ 22.84 .100\39.2 .200\ 71.91 .300\94.47 .400\ 118.40 .500\ 124.08 .600\ 124.08 another formula
124.08 cfm @10'' x .43= 426.8352 c6ae-r

 

Awesome, Thanks a TON.

Now all i need to do is pick up dyno software and start playing with it.

 

JMO..Depending on which (R) heads your looking at.. ?? they had a small r head and a large R head....the larger R head hard the taller ports of the like C1, C4 heads.. that were cast prior to the 66 model year change over to the smaller port heads.. The Larger R heads can be made to flow much better..but with that being said..Its really hard to beat the C4AE-G heads ported with the CJ sized Valves.. For an Iron head if thats what class calls for..Is running an Iron head..

But back when I had my first set of C4's done by a well known head porter in MI..the total was only A little over $700 delivered to my house..I paid shipping too him..and came with all the right parts..But that was back in 2005 or 06 ? for the price to do a set of Iron heads today..You'll be far ahead if you just get the Edheads...and buy the parts to build them over time.. Stock out of the box Edheads will flow 270cfm + at .700" lift with a good guy with an eye and a flapper wheel.. JMO

 

The heads i have are the large port heads. The main reason of this post is for a sled pull truck in a street class that only allows 2-3 modifications so it pretty much knocks out any non ford head.

But i also have a set of c4's i beleive from a tbird? I'll have to check the numbers when i get a chance.

 

Well cool deal if there the tall port heads then...they will work fine for class racing..there's no reason with a proper port work and CJ or bigger, depending on bore size..you couldnt with the right parts pull out say 600+ hp on a good block..I still and always will suggest crossbolts or program caps on a big hp and big tq FE motor..

Good luck on your Build..Keep us posted on your progress !

 

Thanks. Its actually for my girlfriends truck. She just started pulling last year, and learning to drive a standard. lol the block is at the machine shop now i should have it back around the first or second week of may. I'm not planning on doing anything to the heads until i see how its running with the other trucks. Then i'll work on them and the intake

 

Do you know the flow numbers on the c4ae-g heads? How much better compared to the c6ae-R?

 

I would love to know too what they flow stock and what they flow with some porting. I have a stock pair on my 390 and am curious how they compare to some of the aftermarket offerings.