Can you share with us the combo and performance? What heads previously?

Dyno numbers only mean so much, I prefer timeslips.

It's not a all out effort. Just a mild bracket engine.
446ci 440 with 10.4-1 compression Victor intake, a solid flat tappet cam. Small venturi older 950hp carb. I'm still running the factory mechanical water pump alt etc. Car weighs 3425 and its ran a best of 10.43 @ 127.
I'm positive there's a lot of et to be had if I was to change a couple things but I'm a bracket racer.

Those are cool hp no's with that set up = 580hp, how big is the cam.....250/600+? and what are you running it to 6500rpm?.....

Yes 6500 rpm shifts cross the stripe around 6800. Cams 267/600

What gear / tire size / converter?

Thanks

4.30 gear, 30" tire and a 8" 5200 coan converter that was made for my old 383 combo.

. That appears to be an extremely weak attempt a trying to hide casting flaws with a hammer and a punch....

Hollis texted me last night, here's was he and Larry Smith are now getting out if the Trick flows....if I'm not mistaken thats very close to the coveted Standard port Chapman Stage VI's and within about 20cfm at .600 of the Chapman Max Wedges on my 517!

Probably the perfect 470 head for a 4 speed car, awesome torque but with a small block rev cieling. That'd be great in a 383 stock appearing B/E sleeper

damn. any idea what they did?

But YOU are the CUSTOMER! I get he has input as the "expert", but at least insist on a quality rocker, like COMP. Those rockers look scary!

Wize..... The "before" intake numbers look a little funky from .300-.400.
To only gain 9cfm in .100 lift in that part of the curve doesn't seem right.

I'm with you, I would expect the .400 on the Before's to be somewhere around mid-high ~260-ish ? Probably missed wrote a number.

Only passing on what Hollis sent me. No dog in this hunt other than it's interesting and I appreciate all that everybody is contributing to the thread.

Of the posted flow numbers I looked at, most tests showed 45+ cfm gain from .300-400.

Like you said, someone probably wrote it down wrong, or punched the wrong button on the calculator........ But it just stood right out to me.

I'll have to shoot them a note. My OOTB Trick Flow heads are making 715 hp at the moment and should pick up a little with the next round of parts. If they have some touch up work that can add 20 cfm then that could be worth some more power.

My guess is it started with the port opening growing a little......and going in past the pinch.

The bowls are already as big as other BBM heads that flow in the 370's.

Stingy bench?

Reading Fasts' flow# posts through the years I always thought his bench was a little stingy?

Guess there are really no apples to apples when it come to different benches eh?

Think that one fella' posted how he can just about manipulate any numbers he chooses. A written in stone standard 'should' bring these numbers to a tighter curve?

No matter these TFs got my attention for what I need (and more)

yeah when i saw the numbers were down on the OOTB flow numbers i just compared figured the bench was stingy and compared OOTB to ported, not considering much about TF published flows...

but i think fast68 was pointing out the mid lift flow numbers becasue they are down while the higher lift flow comes in line with published TF numbers.

It is like anything else.

If you are in business, you ain't going to be very competitive or last long if you don't give that little 'extra' bang for the buck eh?

Some guys are as right as rain,,,,,,,,,,,,,,,,,,,,others are more like a typical fisherman,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, it's Human nature to make 'your stuff' better than the other guys'!

Take everything you read or hear with a grain O' salt. In time evidence and and statistics will get you outta the weeds?

I've said this previously, might have been in a different thead.
The overall fit and finish on the TF heads is really quite good for an off the shelf item.
I've only had one set of the bb mopar heads here, but have had various different types and versions of TF heads come through the shop for years. The consistancy from piece to piece is pretty good.

I'm not advising anyone to not have their bb mopar TF heads checked out before installing them, but if you have the flowed, cuz you wanna know how good "your" heads are...... For the most part, you're actually going to be trying to compare flow benches, not heads.
Unless the place who does your flow testing has already tested several of that same head( in this case a bb mopar TF head) that you can compare against.
You're not really going to be able to look at your flow numbers and say your heads are better/worse/the same as any numbers you find that came off a different bench.
I'm confident that if I flowed the same port on 20 different TF bb mopar cnc ported heads there wouldn't be 10cfm difference between any of them, at any given lift.
With these heads at least, when you see a set of numbers noticeably different from one bench to another...... It's the bench/radius plate/operator/weather.

Unless the TF QC takes a big nose dive, I don't see how the flow numbers are going vary much at all.

Ultimately, the real proof in the pudding is quarter mile times.

I wish more people would post up their results and combinations.

I understand what you're saying, but the fact is, getting a car to run well at the drag strip is much more about someone's ability(or lack there of) to get a large combination of parts to work together.

383's with unported 906's, with OE carbs and intakes go 10's in stock eliminator, but that has very little to do with what a typical street/strip or bracket racer will get from those same heads.
(My friends Pontiac stocker has been 10.40's at 126+ with heads that flow around 225, running a .480 lift hyd cam).

You could give identically prepared 600hp 446's to 20 people, and leave them to their own devices on coming up with a good way to use those motors at the track, and there will be some that are just way quicker than others.
If you only looked at the slower performing cars it might lead you to believe the combination just doesn't work.

I've recently exchanged a few emails with someone sorting out a new combo.
After a few outings at the track, he swapped out the first converter(made for his application) for another one(also made for his application).
The second converter was almost 4 tenths quicker and picked up about 5mph.
On the Moroso chart, the 5mph shows a 75+hp gain, yet no additional power was made.

My feeling is that a time slip is a report card on the whole combination.

Good cylinder heads are good on their own merits. Some people will get more out of them than others....... Just like every other component in any combination.