331 sbf dyno results today

[grant6395]

331 sbf
Afr 185s
Ported victor jr
Quick fuel 750 double pump
Jones hydraulic roller 232/236 .576 108 sep.104 icl
10.7 compression. Mahle 1.0 mm rings. 2mm oil.
Max 1.5 cfm on the blowby meter during run.
Power peaked at 6800
502 hp/. 445 lb feet. All with break in oil.
1 1/2 primaries.2.5 collector. Tried larger 1 5/8
3.0 collector. 5 hp gain is all.
A/f tuned to 12.6 ish.

[PRH]

Nice numbers, and interesting results from the header hest.

[JoePorting]

Nice numbers too. I would have guessed 425 hp.

[grant6395]

I was pleasantly surprised also. I thought about 1.3 per inch would be the norm for these type of street engines. We were blessed with accurate o2 sensors for a change on the dyno, and ended up with a 6 jet size spread to get them as even as possible. This was with a crappy 12 by 3 inch air cleaner on it also. ( with picked up 8 hp. Lol. ) 94 octane pump fuel. The headers shocked me a bit. I thought the larger tube would prevail by a bunch. But it didn’t. A thank you to mike jones is in order. His lifters and cam worked well.

[JoePorting]

Headers and compression is overrated.

[digger]

Out of curiosity how did the curve change with headers ?

[travis]

Excellent results!

I’m very curious about the headers myself. Was these long tubes or shorties?

[ozyfordman]

X2 for the results and am also interested with the headers. How much mismatch at the port with the small primary? Tri-y or long tubes, stepped? Collector length and diameter? Do the specs agree with Pipemax?Was there a down turn from the port or more like dyno/ boat/ Hotrod headers? Just curious as need to build headers for Hotrod with 2v Cleveland with 1.625 primaries. Great work on a stout combination that should have good manners.

[mag2555]

Nice results there!
Looks like your averaging about 245 Intake cfm to make that 500 hp.

[grant6395]

The headers were a hooker 1.5 diameter primary designed to fit a mustang ll. They turn off the head immediately. No step , long tube/2.5 inch collector.belive me, I rolled my eyes when the customer showed up with them. But, you just never know until you test it. The second set were nothing trick either, just larger tubes 1 5/8 and a 3.0 collector.

[JohnsnsFord2@aol.com]

That is very interesting results on the headers....

[CamKing]

The headers were a hooker 1.5 diameter primary designed to fit a mustang ll. They turn off the head immediately. No step , long tube/2.5 inch collector.belive me, I rolled my eyes when the customer showed up with them. But, you just never know until you test it. The second set were nothing trick either, just larger tubes 1 5/8 and a 3.0 collector.

Which were closer to the size/area of the exhaust port at the flange ?

[Frankshaft]

Fuel flow in lbs/hr and, bsfc's available?

[grant6395]

The headers were a hooker 1.5 diameter primary designed to fit a mustang ll. They turn off the head immediately. No step , long tube/2.5 inch collector.belive me, I rolled my eyes when the customer showed up with them. But, you just never know until you test it. The second set were nothing trick either, just larger tubes 1 5/8 and a 3.0 collector.

Which were closer to the size/area of the exhaust port at the flange ?

They both were close to the exit size, as my customer ground out the inside weld and welded the outside.

[grant6395]

Fuel flow in lbs/hr and, bsfc's available?

I would have liked that info but our fuel flow meter was on the fritz.