Top Head Porters for Yates C3 Heads

[BlackKnight]

After trying to find a set of C3H heads and not being able to do so, I have decided to see if I can have my C3s tweaked a little in the .400 to .700 lift range. As they are now the flow numbers are low, in my opinion, in that range. Currently they are flowing: 267 @ .400, 323 @ .500, 362 @ .600 and 374 @ .700. On the other hand there guys in Australia who are routinly getting 15 - 18 more cfm throughout (every step of the way) that same flow range and a little more from .800 - 1.000. My heads top out at 388 @ .800, which is not bad but, I'm sure if the heads were 15 - 18 cfm more in the lower lift areas, I will pick up power and if I can get them in the 400 cfm range with a 2.180 intake valve that's even better. Who do you guys recommend I send them to to get the most out of my heads? The valve size is 2.150/1.600, however, I am not opposed to going to a 2.180/1.580 valve arrangement if that will get the heads in the 400 cfm range. Any feedback will be appreciated.

[JoePorting]

Those flow numbers sound great for a 2.15 valve. If you want more you'll probably have to upgrade to a 2.20 valve if they'll fit. Give Chad a call. He'll probably comment later on today.

Also, many different flow benches flow 15 to 18 CFM more, so it can just be a difference in flow benches, not head quality.

[mag2555]

Have these heads that you want reworked been run before, and if so please give details of that motor and include the VE seen on the dyno pulls.

[BlackKnight]

I agree with all of the below, and chances are the bench my heads were flowed on was a little more conservative than the other guy's. However, all the head porters that I have talked with, or made contact with here, all say that the C3 head is maxed out @ 900 hp but, the guy (an Australian Pro Stock guy) that ports the mentioned C3s that are flowing 15 - 18 cfm more than mine in the .400 - .700 range is getting 950 hp out of a 424" engine and mine is a 423", 15:1 deal. I'm sure the intake he used (a ported 2939) is better than my ported 2863, which I don' like and will be changing whether I have the heads tweaked more or not. Also, his cam is a little different than mine too. My cam is a custom comp deal: .876/.876 with Jesel 1.70 Rocker System, 281/293 dur. @ .50 and 115 LSA with 57 degrees of overlap.

Those flow numbers sound great for a 2.15 valve. If you want more you'll probably have to upgrade to a 2.20 valve if they'll fit. Give Chad a call. He'll probably comment later on today.

Also, many different flow benches flow 15 to 18 CFM more, so it can just be a difference in flow benches, not head quality.

[BlackKnight]

Thanks guy, I found exactly who and what I was looking for.