Great low lift #'s. Did you do much with the push rod pinch?

Very informative. Nice work on the ports.

Quote:

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So Dwayne, what would the stock head flow before
cutting the tree limbs out of the way(nothing done)
just a average number intake and exhaust?

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I would also like an answer to this please

Mr. P body, the stock 906's ive tested have flowed from the mid-220's to as well as the high 230's with no porting.
just depends on the head.
most std exhaust ports are in the low-mid-150's.

CCDave, it basically took me 2hrs per head to update the porting. its about 30mins per cylinder, and thats broken down to about 22mins per intake port, 8mins per exhaust(in this instance), and about 15-17mins of what was done to the intake port was spent reshaping the short turn.

on a 346/902/452 head.....it would have been about 60-70% of that amount of time(less than 1.5hrs per head).

nonetheless, a nearly 30cfm gain on both sides of the head, well within a usable lift range, for 4hrs labor....is well worth the time and effort IMO.

the pushrod pinch area has been smoothed and blended some by whoever did the original porting.
i didnt even measure the width at the pinch.....but i'll check a few of them tomorrow and see about where they are.
i didnt do any additional work in that area of the head.

Great info Dwayne

Very good info.Thanks for taking the time to post and the pictures too!!

Dwayne - for the seats, VJ, and porting, safe to assume around $500 - $600 into the set of heads? Just asking to point out cost comparisions to Eddy heads. I'm still a firm believer that OEM heads still have their place today.

You can sure tell the difference between the 2 VJ's. Whoever did them, they had a pretty wide seat from the looks of the pic.

Great post as usual

the numbers....side by side

intake port:

lift----B/A---gain
.100--73.1/69.5-- -3.6
.200-133.7/145.5- +11.8
.300-196.4/208.5- +12.1
.400-237.1/257.9- +20.8
.450-241.9/270.7- +28.8
.500-240.3/265.9- +25.6
.550-243.5/269.1- +25.6
.600-241.9/270.7- +28.8
.650-233.9/267.5- +33.6
.700-230.7/261.5- +30.8

exhaust port:

lift----B/A---gain
.100--55.9/56.3-- +0.4
.200-112.3/112.3- +0.0
.300-151.5/158.4- +6.9
.400-163.5/179.2- +15.7
.450-167.4/187.1- +19.7
.500-168.7/189.7- +21.0
.550-168.7/194.9- +26.2
.600-167.4/197.5- +30.1
.650-167.4/201.4- +34.0
.700-166.1/204.1- +38.0

Iron heads shall rise again...LOL!

This topic proves it's worthwhile sending your heads to someone that does porting all the time & uses a flow bench

Great info Dwayne. These are my 906 heads on my 63 that I did and installed the 2.14 and 1.81 valves. Hope they work good enough to beat my boys Dart. Ron

I figured it would be in that range. I re-read my other post - I meant the BEFORE seat width looked wide when compared to yours. Sorry

no big deal but would be nice if the poster/teacher could make ALL his posts/points one right after the other BEFORE any other comments are posted.
sort of like a professor gives his lesson and then opens it up for debate.
no big deal though - good info.

How many other head porters would take you step-by-step thru his process, explaining with pics what, how and why he does what he does? That's intellectual property ! Thanks Dwayne, for your unselfish contributions. As always, you da man!

Great info here Dwayne.... I have done a set of 452's at home and I just tried to copy what I saw him do and follow his lead. I have no practical knowledge of reshaping the short turn on the intake side so all I did was give it a gentle radius. This is archive material for sure... TBF

Hey
Did you happen to get a good shot of the before and after of the short tun rework???

Dwayne,

What happened on the Intake side at .450? Flow went from 257.9 at .400 to 270 at .450, then back down to 265.9 at .500. Looks like turbulance starts at the .650 range so the rise in flow, than the dip between .400 and .500 seems odd.
lift----I/E
.100--69.5/56.3
.200-145.5/112.3
.300-208.5/158.4
.400-257.9/179.2
.450-270.7/187.1
.500-265.9/189.7
.550-269.1/194.9
.600-270.7/197.5
.650-267.5/201.4
.700-261.1/204.1