Those exhaust numbers can't be correct are they? Those are as high as a typical intake runner at that level. Did Jim split the intake and exhaust numbers by mistake, when really, those are all intake numbers?

Good catch mike I screwed that up. how I did that I have no clue. Should be posting exh this week.

[QUOTE=getrdunn;4588125]Jim got back on my heads between projects. He's not done yet but txt over some numbers Saturday.


.200-157
.300-240
.400-315
.500-370
.600-404
.700-424
.750-431

Raised the floors. (Corrected on 10/29/17)

Should have exh this next week.

Ha, I was going to say, those are some insane flowing exhaust ports. My heads have a strong exhaust port, but they are not flowing 315 @ .40

No, at 0.400" they should be around 248cfm, if these heads are based off the AFR exhaust. 297cfm @ 0.700"

Mike knew I misprinted but wanted to make note of it and have a little fun at the same time.

I noticed the promaxx 340 cnc head which probably has same exh port as the 317's flow like 300 @ 700 so I'd say very similar although the same 340 cnc head intake flows 398 at same lift. I'd like to see 315 @ .700. I recall Jim not real pleased with the out of the box exhaust numbers. If he can work his magic on those as he did the intakes will be a big thumbs up. At the very least more options regarding aftermarket.

Here's a their 340 cnc head flow numbers below:

ProMaxx BBC 340cc CNC Ported (Bare Heads)

Specs:
2.300"/1.880" valve sizes,
121cc-127cc chambers(Your Choice)
340cc Intake Runner

Flow Specs @ 28" w/2.300"/1.880" w/30* Backcut valves

.200" .300" .400" .500" .600" .700" .800" .900"
Intake 172 267 318 358 383 398 409 413

Exhaust 139 190 236 265 285 300 304 307