What is the HP on this 351c I built

**machwone** · 09-06-2009, 01:37 AM

Stock 351c 4v CC Heads,
.30 over forged pistons,
10.5 to 1
crane power max cam .525/.536 280/292.
1.73 rocker arms,
new vlaves, and seats, mild mill work,
torker intake,
750 holley dp
hooker headers 3 inch exhaust
accell distributor

2870lbs car, stick, 380 posi 26inch tires
Any idea of HP? torque? 1/4 mile?
I know someone out there has a computer dyno, please help me out

**73FordDriver** · 09-06-2009, 05:53 PM

i see a good 375hp. maybe more. dont know much about the 4v heads.

what kind of car is it goin in?

**machwone** · 09-06-2009, 06:32 PM

67 mustang coupe

**plovett** · 09-06-2009, 06:48 PM

What's the 0.050" duration figures for that cam? Lobe separation angle? Are the headers 1-3/4"?

paulie

**machwone** · 09-06-2009, 10:26 PM

cam is .528/.536
226/230
112 LSA
correct on the headers

**Spali32** · 09-07-2009, 01:51 AM

I would guess 350-375hp at the crank. Take it to the track......that'll tell us exactly what kind of hp it's putting out.

**plovett** · 09-07-2009, 08:36 AM

I found some flow figures for stock 351C 4bbl heads. I put that and all the rest of your data in Dynosim.

With open headers it says 455 hp at 6000 rpm and 464 ft/lbs at 4500 rpm.

With Mufflers it says 438 hp at 5500 rpm and 449 ft/lbs at 4500 rpm.

My experience with Dynosim is that the hp figures are close, but the torque figures are higher than in real life. I'd guess your torque will be closer to 420 ft/lbs.

I have Drag2000, but I haven't installed in my new computer yet. I'll see if I can find it. If I find it I can get it to simulate a 1/4 for you. I found it to be very accurate predicting what my 428 runs.

Hope this helps,

paulie

**machwone** · 09-07-2009, 12:31 PM

thanks. Im no expert but should I loose 17 hp with mufflers? They are flowmaster super 40's with 3 inch from the header with a x-pipe. cut outs before the muffler.

**plovett** · 09-07-2009, 12:41 PM

Quote:

Originally Posted by machwone

thanks. Im no expert but should I loose 17 hp with mufflers? They are flowmaster super 40's with 3 inch from the header with a x-pipe. cut outs before the muffler.

Depends on the muffler. I could see you losing 10 hp with those mufflers.

JMO,

paulie

**Spali32** · 09-07-2009, 08:44 PM

IMHO.......Flowmasters are the worst when it comes to flow........they hurt HP. Magnaflow I've heard is a good flowing/hp building/sounding muffler.