My 598 C-Head

Went to the dyno yesterday with my 598.

In Super Gas trim. Throttle stop and all with a Stinnett prepped 1050 Holley she made 830 ft lbs @ 6000 and 1011 hp @ 6800. Average from 6000-7200 790ftlbs/990 hp

Switched to a QFT 1250 and picked up 10 on the peak but average was down 5.

Not bad but less than I had hoped.

This guy tells me that his dyno is Stingy.. He routinely gets told that motors are making 125-150 hp less on his machine than others in the Vancouver area.

Will be going over it this winter just to check it out. I think I might be leaving some crumbs on the table.

One weird thing I found was that it seemed to want lots of timing.

Ran it all year around 28.

picked up 25 or so when we went up to 36 degrees of timing??

I think I better check my timing pointer again...  

dkp

My bit of experience with C heads is that they love timing. Not what you like to see but give the motor what it wants.

Bret

Gord merkley's dyno does give low ratings compared to the others I've used around here.

A dyno is just for baseline tuning. Get it on the track and see what it likes. I also highly doubt that his dyno is 125-150 hp short. It's more like the others are very good at selling happiness.

Curt wrote:A dyno is just for baseline tuning. Get it on the track and see what it likes.  I also highly doubt that his dyno is 125-150 hp short. It's more like the others are very good at selling happiness.

I agree. I ran this motor all year but it was a new combo. did not have time to dyno before the season. Just wanted to know where it was before starting winter maintenance.

Not unhappy with the result but I think there is some room for improvement.

dkp

I'd say that the numbers are in the ballpark. Mine has a little more bore, and it was about 1025hp. Mine liked the timing up there too. It settled in at 34*. The guys that are making over 1100 are using several items to get there, and although they don't each add much, they will start to stack up. Vac pumps. crank triggers, etc. FWIW mine has a 1450 QFX on it, and I'm not sure that more wouldn't be better.

X2 in regard to what Bret said.....the C460 heads like more ign. timing than most of the other Ford heads.

36 degrees was the number my 600 C headed motor ran the fastest when we ran N/A , now 2 big kits of nitrous the timing is a whole different ball game!!
Frank

I know for a fact that 2* timing can mean 1.5 tenths on the track also. 

I have a couple of 483s that really like 38-39 on the dyno but I like a degree less on the track. Just so you know Profiler 12 degree Chevy heads seem to like only 2 or 3 degrees less than the Cs.