Will this combo make 430hp?

Joined: March 8th, 2012, 8:27 pm

March 27th, 2013, 12:50 am #1

351c. .030 over
4v ss valves no porting at all.
Flat top trws older forged ones
F246 cam
Trick flow box R efi intake
Hooker competition headers.
Roller rockers

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Joined: November 26th, 2003, 2:49 am

March 27th, 2013, 1:03 am #2

Should be around that number provided your compression is at least 10.1

Cheers
Tony
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Joined: September 6th, 2010, 5:18 pm

March 27th, 2013, 1:23 am #3

351c. .030 over
4v ss valves no porting at all.
Flat top trws older forged ones
F246 cam
Trick flow box R efi intake
Hooker competition headers.
Roller rockers
be dang close I'd guess an honest 425-445hp.
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Joined: March 8th, 2012, 8:27 pm

March 27th, 2013, 1:34 am #4

Sounds good to me... I'm sure my compression is at least 10.1... It was zero decked and has the trw2379 flat tops...
Heads as far as I know where not decked.
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Joined: August 2nd, 2003, 5:23 pm

March 27th, 2013, 2:09 am #5

351c. .030 over
4v ss valves no porting at all.
Flat top trws older forged ones
F246 cam
Trick flow box R efi intake
Hooker competition headers.
Roller rockers
Ran this combo for several builds and it never quite made 400. Those runs were on a SF901 dyno, 1970 heads, F246, 700DP, Torker & Weiand, headers, otherwise stock.
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Joined: March 8th, 2012, 8:27 pm

March 27th, 2013, 2:25 am #6

Didn't even make 400?'!?!?

Geez... I thought they made 330 stock... This is disappointing now considering you have actual Dyno numbers...
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Joined: September 6th, 2010, 5:18 pm

March 27th, 2013, 3:24 am #7

Regardless of what it makes on a dyno, that is going to be a hard running engine. With 4.11+ gears its gonna be a handful on the street.
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Joined: July 24th, 2008, 10:06 pm

March 27th, 2013, 3:58 am #8

Didn't even make 400?'!?!?

Geez... I thought they made 330 stock... This is disappointing now considering you have actual Dyno numbers...
My 3200 pound car runs 12.00 at 114 mph with 400 hp, There are a lot of shops that clame big numbers but when the engine is taken to the drag strip
the real numbers are alot smaller than clamed! I have seen clamed 500 hp engines run 13.00second ets When the weigth of the car and MPH is figured in the engine is making some kind of 300 hp number.
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Joined: October 23rd, 2005, 1:22 am

March 27th, 2013, 5:03 am #9

Only if the Compression is 10.5 and greater
This is from my own personal Dyno testing .
400 uncorrected HP is still very Strong
Last edited by GT-SCOTT on March 27th, 2013, 5:06 am, edited 1 time in total.
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Joined: October 1st, 2004, 8:05 pm

March 27th, 2013, 6:41 am #10

351c. .030 over
4v ss valves no porting at all.
Flat top trws older forged ones
F246 cam
Trick flow box R efi intake
Hooker competition headers.
Roller rockers
I dunno if you're a drag racer or just a street guy like me. I admit advice to build a drag race car is best given by folks other than myself. But I have some hopefully encouraging ideas to share with you.

I agree with all the comments here. 400 is probably a good "average" BHP figure for the F246 (and 400 bhp is plenty of horsepower for street tires). But the devil is in the details and its the details I want to discuss.

I've seen bigger BHP readings with that cam. With the right honing equipment, and an expensive set of skinny rings; with porting and 3 angle valve seats; with a strip dominator and 850 Holley (I think its a 9380, the one with annular boosters). With the 4V heads and powerbands up to 7000 rpm the cam kinda takes a back seat to the induction system. We're focusing too much on the F246 cam. The way to make the power numbers go up is to improve the volumetric efficiency. Valve lift, cam lobe design, and valve springs play a part in that. But so do the heads, intake manifold and exhaust system. That's why guys looking for more power ported the heads, selected the strip dominator intake and the big Holley with annular boosters.

To make my point, I know a guy whose standard displacement 4V Cleveland makes 500 BHP at 6000 rpm with a very small Crane HR-216 hydraulic roller cam! Only 216 degrees @ 0.050" intake duration. The motor has independent runner induction and a bundle of snakes type exhaust with very open mufflers. The cam is not responsible for all that power ... its the intake & exhaust systems, plus the cylinder heads (which are mildly ported). The volumetric efficiency of his cars motor is very high. The 4V heads are capable of very high volumentric efficiency, the intake and exhaust systems of that motor are not hindering that performance.

So there's hope here ... because you're using that fuel injection manifold. Eveyone else has experience with carburetors and single plane manifolds. Sinle plane manifolds are handicapped, the 4 outside runners are long but they have to curve to mate with the heads. The 4 inside runners make a straight shot into the heads, but they are too short. That Trick Flow manifold is a bit of an unknown as far as 351C induction systems go. Fuel distribution and fuel atomization should be much better with a port type fuel injection system. Those straight shot equal length manifold runners will help too. Your motor may pull down some surprising numbers.

One last thing, what I learned being involved with the 351C long ago, there's more to it than big horsepower numbers. Its the powerband and the power characterisitic that counts. That's why a 351C powered car can beat cars powered by larger, more powerful motors. The 351C 4V has a power characterisitc, the charging rhino, that dominates cars powered by other motors, both on the street and on the track! Going fast with a 351C means assembling the motor with parts that support that power characterisitic, and giving the car the right gearing. I think the 351C will work well with that Trick Flow manifold.

Good luck with it ... and enjoy the journey.

-G
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Pantera Photos | Pantera Motors | Six Photo Albums of 351C Info | One | Two | Three | Four | Five | Six

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Last edited by gpence on March 27th, 2013, 6:55 am, edited 1 time in total.
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