AFR 552 build w/ dyno numbers

Just thought I’d post up another AFR build for people to reference. I had Scotty at PPAM build me a 552 for my 78 bronco that sees a little street time and lots of dune/sand drag time. Ran it last weekend and am very happy with it.

D9 block
Lunati 4340 crank
Lunati 6.700 H beams
Diamond pistons
OTB AFR295’s
OTB AFR 4150 intake
Solid flat tappet camshaft
252/266 @ .050
.604/.636 lift
Installed at 106
My Holley 1000cfm 4150 (too small)
11.1:1 static
8.75:1 dynamic C/R
Run on 93 pump gas
Made 683 hp @ 5700
683 ft/lbs @ 4400
In a 95 degree dyno cell.
On a cooler day with a powercone spacer and bigger carb id like to think it’d break 700hp/tq, but it’s really just a number.
Will continue to thank Scotty for his hard work and knowledge. I put him on a pretty tight schedule with this one and he pulled through, and as always was a pleasure to work with.

Now does anyone think I can get a big enough 4150 carb to feed this thing? Lol

Is your engine still showing any vacuum at WOT in the higher RPM ranges??

Absolutely! A whole 2 inHg lol

What are the corrected numbers?

dfree383 wrote:What are the corrected numbers?

Not sure.

Fordaholic495 wrote:

Now does anyone think I can get a big enough 4150 carb to feed this thing? Lol

Certainly but, those available with 1,200 or so cfm are more expensive than most people care to spend; except those who have class limitations.

Fordaholic495 wrote:Absolutely! A whole 2 inHg lol

My good friend Dominic at "Thumper Carbs" (760) 900-3895 builds a very nice billet 1020 CFM carb that is 4150 style mounting flange.
He's very active on Moparts.com on the forums, and has quite a few very happy customers!!
You can look up Thumper Carbs on FB too!!

BBFTorino wrote:

Fordaholic495 wrote:Absolutely! A whole 2 inHg lol

My good friend Dominic at "Thumper Carbs" (760) 900-3895 builds a very nice billet 1020 CFM carb that is 4150 style mounting flange.
He's very active on Moparts.com on the forums, and has quite a few very happy customers!!
You can look up Thumper Carbs on FB too!!

I already have a 1000 cfm Holley, don't think 1020 cfm would help much. Just need to bite the bullet and go dominator

He does bitchin Dominators too!!

rmcomprandy wrote:

Fordaholic495 wrote:

Now does anyone think I can get a big enough 4150 carb to feed this thing? Lol

Certainly but, those available with 1,200 or so cfm are more expensive than most people care to spend; except those who have class limitations.

Google
get'm garage

Messing with those big 4150’s in the past I wouldn’t waste my time with them if your rules will allow a dominator, the dominators always seemed to make more power at the same cfm level.

dfree383 wrote:Messing with those big 4150’s in the past I wouldn’t waste my time with them if your rules will allow a dominator, the dominators always seemed to make more power at the same cfm level.

This is what I'm thinking. This winter I will swap intakes and probably have get'm or prosystems build me a carb. I'm having too much fun using it right now to tear it apart lol

No experience with Getm, but Patrick at Pro systems knows his stuff. The carb he sent me (configured based on the specs we sent him), yielded the best dyno numbers as shipped.