906 heads, home port vs. "Pro" job
#29360
08/30/06 10:12 PM
08/30/06 10:12 PM
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fast68plymouth
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its still surprises me how much work i'm doing with OE BB heads. shortly after the E heads came out, the market for reworked OE heads disappeared. however, in the last year or so, ive seen a renewed interest in having OE BB heads refurbished, and/or reworked.
my guess is that with the value of BB powered Mopar muscle cars continuing to climb many people feel that the more original the appearance of the car, the better it will retain its value.
personally, i'd rather have something with E heads on it myself.....but if you're planning on using the car in some sanctioned events(like F.A.S.T.) that require the use of OE heads....thats not a viable option.
i don't get this too much anymore, but when OE heads were quite popular, people would send me some heads they had done some home porting on, to have me finish the valve job, or set up for dual springs, flow test, etc. often times, they were heads that had been bought used, that had been previously ported and were being sent to me for a freshen up.
i have a set of 906's in the shop now that were bought by someone putting together a 440 RR. i dont recall all the details of the story with these heads, but IIRC the port work was done by the shop that did the valve and guide work. its obvious that whoever ported them doesnt do a lot of this type of work, but the guide and seat work were fine.
what port work was done did improve the flow somewhat, and they did little enough so as not to ruin the heads for more extensive port work down the road. i think these heads were bought pretty reasonably, and everything is new, and they had not been run yet.....so they were a good way to get into a set of ported OE heads for reasonable $$$. new bronze guides, new 2.14/1.81 stainless valves, flat milled, valve job, Comp dual springs with 10deg retainers and locks, new seals, etc. from a functionality standpoint, these heads were good to go. the guide fit is decent, and the valve seat work was fine. they could have been bolted right on, and the motor would have run fine.
well....they did have some exhaust bolt hole issues, but other than that, they were fine.
the buyer brought them to me to have me check them out, flow test them....and give them an overall evaluation/recommendation.
i suggested installing hardened exhaust seats, and touching up the port work to take better advantage of the larger valves.
however, installing hardened seats creates a small problem with heads that are already done. when you install the exhaust seat, it distorts the intake seat next to it. so, you end up having to do the valve job over again.
nonetheless, the decision was made to go ahead with that plan.
this presented an opportunity to show the difference in flow that is actually pretty typical when comparing heads done by someone doing them at home, or by a shop that doesnt really specialize in race head prep, and heads done by someone who does this type of work for a living. esspecially when the heads in question are 915/906 castings, as opposed to the later 346/902/452 style heads.
i figured the best way to show the difference......is to start with a set of ports thats already been done by a DIY type....and then rework that same set of ports.
what you'll see is that there can be a pretty significant difference in flow between what boils down to the same basic job.....which in this case is a set of 906's with your basic street/strip type port job.
attached is a pic of the head as i rec'd them.
this is really pretty typical of what most of the home ported heads i see look like
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29365
08/30/06 10:35 PM
08/30/06 10:35 PM
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fast68plymouth
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its important to point out that there was no short turn work done on this intake port. it was still as cast.
while its true that the old MP engine manuals warn against reshaping the short turns at all, the fact is....on the 906/915 heads....the intake short turn rules the port. no short turn work......no big flow.
here is how this set of ports flowed as they are in the above pics:
lift----I/E .100--73.1/55.9 .200-133.7/112.3 .300-196.4/151.5 .400-237.1/163.5 .450-241.9/167.4 .500-240.3/168.7 .550-243.5/168.7 .600-241.9/167.4 .650-233.9/167.4 .700-230.7/166.1
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29366
08/30/06 10:37 PM
08/30/06 10:37 PM
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fast68plymouth
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the first step in the upgrade was to install some hardened exhaust seats
first...you bore a hole for the insert....
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29368
08/30/06 10:41 PM
08/30/06 10:41 PM
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fast68plymouth
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....then machine the desired angles onto the seat.
nuthin' fancy here.....just the std 30/45/60, with a 75 deg bottom cut.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29369
08/30/06 10:43 PM
08/30/06 10:43 PM
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joedust451
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I'm in no way an exspert, but it seems alot more could have been done to the bowl areas, i spent 25+ hrs. on my 906s, practiced first on a dummy head & got some good pics & info to help, i picked up about .2 & 2-3 mph from what i did, total cost was right around 200.00 including gaskets, i don't think i'll enjoy doing another set but i'll never ever complain on what it cost to have a set done by a pro ![](/ubbthreads/images/graemlins/beer.gif) It was always nice to lift my hood & show them iron heads & no juice ![](/ubbthreads/images/graemlins/eeek.gif) 1.609 60ft. 10.87@ 123.58 in the heat
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29370
08/30/06 10:43 PM
08/30/06 10:43 PM
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fast68plymouth
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after the exhaust seats are installed, you can recut/regrind the intake seats.
same angles used for the intakes on these heads.
i'm now ready to tweek the port work, and reblend the bowls into the valve job.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29372
08/30/06 10:51 PM
08/30/06 10:51 PM
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fast68plymouth
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okay....here's an excellent illustration of how important the short turn is on a 906/915 head.
i intentially did not do any short turn work at this stage of the rework, just to prove the point.
the bowl has been reblended into the valve job, and some minor cosmetic guide trimming done as well. the short turn side of the bowl has been carefully blended into the seat, but none of the hight of the short turn has been removed, and i was careful not to make a "peak" where the blending and casting meet. it is a smooth transition, just as the MP manuals and porting templates would have you do.
i also back cut the intake valve for the follwing tests.
as you can see by the pic.....it has a more professional look to it...and there is a nice little gain in the .200-.300 area......but without fixing the short turn.....no real gains were made in the higher lifts(actually, a slight loss of peak flow).
lift---flow .100--69.5 .200-145.5 .300-206.1 .400-237.1 .450-241.9 .500-241.9 .550-241.9 .600-240.3 .650-235.5 .700-233.9
if this was as far as the rework went....very little HP gain would have been had. there would be some power gain because the exhaust port picked up nicely(no real short turn work necessary on those).
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29373
08/30/06 10:52 PM
08/30/06 10:52 PM
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MR_P_BODY
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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? ![](/ubbthreads/images/graemlins/wave.gif)
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29375
08/30/06 11:01 PM
08/30/06 11:01 PM
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fast68plymouth
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this is what the finished job looks like. i didnt do anything to the port openings because at this stage of the game, thats purely eye candy. well...additional eye candy. the major lumps in the exhaust ports had already been removed, so i didnt want to spend the customers $$$ on just making them look prettier. but, had they been left untouched, i would have had to go in and work that part of the port a little bit for this level of flow. you usually dont get 200cfm from a stock exhaust port with nothing but a bowl job.....some work has to be done to the whole port.
from this angle, the intake port doesnt look any different with the short turn fixed.....but it makes a big difference in the flow numbers.....and power output(if the motor is good enough to be able to use it).
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29376
08/30/06 11:10 PM
08/30/06 11:10 PM
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fast68plymouth
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heres another shot of the finished exhaust bowl.
the intake port picks up big time when the short turn is done correctly, and you have the bowls opened up enough to let some air through.
the only added work between the previous test and this one is reshaping the short turn. this is a fairly aggressive amount of hacking on the intake short turn, but not as much as you'd do for a motor that was going to see a high lift(.600"+) camshaft, and/or a lot of rpm.
this motor will be getting a mid-.500" lift flat tappet cam, so i left the final approach from the short turn into the bowl pretty steep. this is a trade off....better low/mid-lift flow.....some high lift turbulence remains.
finished results:
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
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29378
08/30/06 11:25 PM
08/30/06 11:25 PM
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one of the inportant things to remember here is....the 346/902/452 heads have a very different shape to the intake port. one thats MUCH more user friendly for the DIY type head porter. they have essentially no short turn, and no guide boss. the two areas that you spend the most amount of time reworking on a 915/906 head if you're trying to get big numbers out of them.
the down side is they generally dont flow as good in the mid-lifts. however.....i say that as someone with quite a bit of experience and flow bench time fooling with 915/906 heads.
as you can see by the numbers in the first test....the mid-lift numbers on the 906 arent going to be very good either if you dont get the short turn right. on the 346/902/452 head.....you basically just need to put a radius where the bowl cut meets the floor, and you're done. the 915/906 head requires careful(and somewhat substantial) reshaping of the short turn before the heads start to give up decent results.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: ccdave]
#29382
08/30/06 11:54 PM
08/30/06 11:54 PM
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fast68plymouth
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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.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29385
08/31/06 12:08 AM
08/31/06 12:08 AM
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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 ![](/ubbthreads/images/graemlins/thumbs.gif)
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29386
08/31/06 12:16 AM
08/31/06 12:16 AM
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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
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: Mills]
#29387
08/31/06 12:24 AM
08/31/06 12:24 AM
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Quote:
Dwayne - for the seats, VJ, and porting, safe to assume around $500 - $600 into the set of heads?
Mills.....the price to update these heads is going to be about $580-$600.
-disassemble heads, flow test -install hardened exhaust seats -machine seats and bowls -back cut intake valves -4hrs porting + additional flow testing -wash heads & parts, assemble, set spring pressures
if they were being done from scratch, to this same level of modification(parts and labor), they would easily cost a few hundred more than a new set of E heads.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29389
08/31/06 12:51 AM
08/31/06 12:51 AM
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383man
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Great info Dwayne. ![](/ubbthreads/images/graemlins/thumbs.gif) 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. ![](/ubbthreads/images/graemlins/biggrin.gif) Ron ![](http://pic7.picturetrail.com/VOL188/1011563/2193145/122523029.jpg)
Last edited by 383man; 08/31/06 12:52 AM.
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29391
08/31/06 02:37 AM
08/31/06 02:37 AM
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Quote:
this is what the finished job looks like. i didnt do anything to the port openings because at this stage of the game, thats purely eye candy.
What have you found as far as "results" on a high-polish in the combustion chambers ?
Or is that just eye-candy ?
And on a typical 906 or 452 ....what is the diff in CC's in that chamber ....dead-stock vs highly polished ?
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Re: 906 heads, home port vs. "Pro" job
#29392
08/31/06 03:08 AM
08/31/06 03:08 AM
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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. ![](/ubbthreads/images/graemlins/thumbs.gif)
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Re: 906 heads, home port vs. "Pro" job
[Re: tpabayflyer]
#29395
08/31/06 07:15 AM
08/31/06 07:15 AM
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This is archive material for sure... TBF
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Re: 906 heads, home port vs. "Pro" job
[Re: mark_gates]
#29399
08/31/06 01:16 PM
08/31/06 01:16 PM
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Quote:
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!
I agree""
I myself made the classic mistake of not touching the short turn. Dwayne unselfishly showed me what I did wrong and even fixed a port for so I could use it as a example to fix the rest. Great guy my hats off to him. mike
73 Sport 440, 509 cam w/Eddys 3.91 and 28.1"/27.3 tire. Et. 60 ft. 1.435, 1/8th. 6.61 @ 101.80 mph. 1/4. 10.472 / 127.78 mph. 2950# race/with me,and pump gas.
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Re: 906 heads, home port vs. "Pro" job
[Re: ccdave]
#29400
08/31/06 09:26 PM
08/31/06 09:26 PM
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fast68plymouth
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Quote:
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
well....basically....this is the trade off for leaving the short turns final approach into the bowl fairly steep.
on this port, up to around .450 lift(it was actually around .470 lift where the "problem" occurs) the air column is being effeciently turned into the bowl, and the entire diameter of the valve is being taken advantage of. when you try to get too much air over the short turn, the bottom of the air column has a hard time staying connected to the floor, and it starts skipping over the short turn, at which point the air column rides across the back of the valve, effectively shutting down the short turn side of the exit into the chamber. this is why the flow drops as the valve is opened slightly beyond the point where the entire area of the valve is being utilized. once you surpass that point, the effective curtain area is diminished, and the flow decreases. then, if the port hasnt gone completely turbulent, the flow will continue to climb as the valve is opened, until you reach some other limitation in the port...which in this port, was again the short turn.
its this added height and steepness of the short turn on the 906/915 head that allows it to out-flow the later castings in the mid-lifts(when properly shaped to do so). the newer castings just dont have enough short turn height and length to effeciently turn the air column in that lift range. they generally start having the air column sliding over the back side of the valve at a little over .300 lift. its very easy to hear when you're testing the head when the shift in flow from the whole valve area, to the partial area happens.
basically, if you kept lowering, and laying back the floor of the 906/915 intake port, it would start to get more and more like the later design castings.....meaning, you will generaly start to lose flow in the mid-lifts, and in doing so, hopefully delay the point at which the onset of turbulence happens. this is the trade off.
actually, the next step from this point would be to start whittling down the guide boss, to make more room for the air column near the roof of the port, to try and minimize the congestion at the short turn floor. this would gain you upwards or 6-10cfm.....although you might still end up having to tweek the short turn a bit more to get to a solid 280cfm.
when you're trying for the 290cfm range, and stable to .650 lift or more....the short turn will be layed back, and lowered quite a bit more than what i did here....and the guide boss needs to be more or less eliminated.
as far as a pic of the short turn....its the area you cant see thats critical. you would need to have the head cut apart lengthwise through the intake port to see the shape of the short turn for a pic to be of any use at all. the short turn is ported by "feel", and the results verified on the flow bench.
i checked the pushrod pinch width of these heads today. they varied from about .995 to as big as 1.025. the one for this cylinder that was tested was 1.015.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: fast68plymouth]
#29401
08/31/06 09:48 PM
08/31/06 09:48 PM
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So. Burlington, Vt.
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for comparison, here is a set of numbers from some 906's i ported last week. these are also going on a motor thats getting a mid-.500 lift flat tappet cam, so again, i didnt go for the "big number" at .700 lift. these also used a smaller than 2.14 intake valve, and a 1.74 exhaust valve. these got a fair amount of additional work compared to the reworked "home port" heads. the pushrod pinch was opened to 1.060, and the guide bosses were streamlined quite a bit, but i left as much of the bulkiness of the intake guide boss in the port as possible, and still get a decent number(yes, there is a reason for me leaving as much of the guide boss in the port as possible, and the smaller intake valve....but you guys will have to figure that one out for yourselves ![](/ubbthreads/images/graemlins/apimp.gif) ). the intake port opening is the same size as an OE valley pan gasket, and the exhaust port openings are barely any bigger than as cast(basically, just "squared up"). lift----I/E .100--69.2/51.9 .200-145.0/109.3 .300-210.3/150.0 .400-257.9/179.2 .450-274.7/188.4 .500-279.6/195.6 .550-282.0/203.4 .600-274.7/207.3 .650-274.7/209.3 .700-275.5/211.9
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 906 heads, home port vs. "Pro" job
[Re: BradH]
#29406
09/01/06 10:23 AM
09/01/06 10:23 AM
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Joined: Jan 2003
Posts: 16,934 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,934
NC
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Quote:
lift----I/E .100--69.2/51.9 .200-145.0/109.3 .300-210.3/150.0 .400-257.9/179.2 .450-274.7/188.4 .500-279.6/195.6 ...
Those are some good 906 iron heads.
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Re: 906 heads, home port vs. "Pro" job
[Re: 440Jim]
#29407
09/01/06 10:27 AM
09/01/06 10:27 AM
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Joined: May 2005
Posts: 6,446 NJ-USA
HPMike
master
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master
Joined: May 2005
Posts: 6,446
NJ-USA
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Re: 906 heads, home port vs. "Pro" job
[Re: Bob_Coomer]
#29409
09/01/06 12:27 PM
09/01/06 12:27 PM
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Joined: Dec 2003
Posts: 3,957 West Coast, CA
Troy
master
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master
Joined: Dec 2003
Posts: 3,957
West Coast, CA
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Hi Dwayne. Is there much of a difference between porting a Mopar Performance Stage V head over a 906/452? If equal time spent on a 906/452 and a Stage V head, how much CFM would you see different between the two heads?
BTW, Very good reading, Thank You.
....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
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