Hooker 2 inch chassis headers. No shop carb. Yeah it started trending rich around 4100 it looks. Man I wish I could of talked to Dom during the session. It will be fine though got it broke in and some numbers. Will fine tune with a AFR in the car. Thanks again Dwayne that little cam worked pretty dang good. Think it will be right at home on the street.

How much do your heads flow ?

Is that supposed to be the uncorrected data sheet followed by the corrected data?

Any idea what the atmospheric conditions were during the tests?

Does your data include the correction factors?

Numbers look pretty stout. Ought to be fun riding in anything under 4000 lbs.....Interesting that a solid cam motor ran out of steam under 6 grand. Good job.

Congrats, it runs real nice. What did you change in the carb for the second run? What was the best timing?

Todd , thats 14 deg down on the ft in my 440 . Especially with stock ports on a 512

Tex

Congrats. Nice numbers ! Ron

Nice numbers and thanks for sharing. I'm planning on a 512 build at some point with similar compression and same heads so gives me a pretty good idea of where I may end up with it.

Looks to me like 2 different correction factors....... SAE vs STP.

Based of the fuel flow and bsfc........ the uncorrected peaks are 632tq@4500, 579hp@5400.

At peak HP, the correction for STP power would be 1.1135.

It “appears” as though the carb going rich def cost some top end power.
The bsfc number of .451 in itself really isn’t that bad....... but the a/f ratio in the 11’s, in that part of the power curve, is going to cost some power.

For the peak tq and peak hp to only end up 900rpm apart is a bit odd for a motor with decent heads/intake and a dual pattern 112lsa cam.

I had a 505 on the dyno a couple years ago........ stage 1 RPM’s and a 6bbl.
Peak tq @4300, peak hp @5800.

I def feel that with a more optimized fuel curve, the hp peak would have moved up a few hundred rpm.

Ahhh... didn't notice the two different correction factor methods used.

The SAE one looks far more realistic.

To answer a few questions and the 1st being why the small carb and no Dommy is because of the car the motor was originally going in is heavy as in 3700+ lbs iirc w/a tight vert and tall gears which as we know don't play well together. The first pull and curve started a bit lean as the float level was too low so they raised it and jetted up at the same time making it even richer so they removed only the primary jets and left the secondary's in which didn't help but if we could of talked I would of suggested bringing the rears back down to the 8 jet spread and bigger hi bleeds would of smoothed it out nicely. Small carbs on big motors do just what I expected it to do being the velocity goes up big time pulling harder on the boosters hence going rich and my dart hates 4150's makin my car too peaky down low and not happy up top lacking the needed air flow and why I put bigger than normal carbs on stuff usually with great results but it's all a learning curve for sure......

Yeah I screwed up on the jetting deal. After talking to Dominic today I understand now what he was talking about. After telling him what I did and him reading the AFR data. My mistake made sense to him. I got a better handle on what to do now. And definitely believe there was some HP and RPM left on the table. With the messed up fuel curve I created. Thats on me. Thats why I went with the Thumper built carb. He's a phone call away and explained what I did wrong in a way even I could understand. The carb performed perfect. Reason I say that. Is the carb did exactly what I made it do and it showed up in the data. So even with this baseline. I know what changes to make. Then I can fine tune the carb in the car under real time condition with a AFR gauge. Thank you again Dominic. I posted the SAE and the STD correction factors just for comparison

I've done some stupid stuff myself, who hasn't and you're right, I think it would of picked up another 15-20 hp imo based on some recent track and dyno data some racers send me and actual at the track improvements. I did a pr of blp billet 4150's for a Nostalgia SS guy Fred B, and his Hemi picked up 42 hp from jetting down 2 sizes in the blp jets I use and made 994 hp and went 8.90's foot brakin and it's not light either.......Fun stuff......