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#141
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No, did not come with flow numbers, but want to have them flowed.
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The Following User Says Thank You to X72GPX For This Useful Post: | ||
#142
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Mine came Monday. CNC at intake port entrance on walls back to head bolt and down floor. Will pull some valve springs off to teat and look at pockets today. After it warms up here a friend and i will flow on his bench.
And not full of CNC shavings like the Edelbrocks I got back from KRE!
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#143
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What do you think they flow?
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#144
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I'm interested in what the seats and seat areas look like.
.
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#145
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Makes no sense that a ported head comes without flow numbers.... Especially a CNC ported head.
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The Following User Says Thank You to PAUL K For This Useful Post: | ||
#146
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For $1500 pair , I'd say you have done EXTREMELY Well .
Looks like they were mostly just getting the runners straightened up and trued and uniform.. That's all that most of us would ever need, Worth the extra $300 versus the basic raw cast units. Should be at least an extra 10-20 cfm over the raw cast 280 cfm . Even if you don't use those springs you are still WAY ahead over what 1500 will buy on the open market. Even at 280 cfm they are overkill for my needs. But I'd pay the extra 300 to have them trued up like that - IF I were in the game for 1200 raw versus 1500 cnc |
#147
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Intake port 2.350-2.380(nit straight across top and 1.185 wide. Compared to a FelPor1233 raised at the top. going to need a taller gasket and a Torker 2 or tomahawk will probably need welding at top.
Valves have back cut stems and a rough swirl polish, no back cuts on head. Intake valve stamped 1074, Exhaust 1075. intake has 5 shims under it IH 1.775, exhaust 4 shims 1.795 IH. No shims intake 1.935, Exhaust 1.915. Valve spring free length 2.430. 1.775 IH 139 .600 lift 320 CB .770.770. Long free length had to unscrew compressor to release it. red stripe kind of like the 99893(?) Dave at SD uses and about the same seat. Valve keepers cut for lash caps and decent looking retainers. Very basic 2 angle valve job large outer cut and the seat cut . there is a cut underneath both that is probably just form the CNC machine as is is not concentric with the actual seat. Seat in throat pretty rough from CNC machine. In throat seats i looked at have good base.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs Last edited by Skip Fix; 02-01-2023 at 03:16 PM. |
The Following 3 Users Say Thank You to Skip Fix For This Useful Post: | ||
#148
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More
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following 2 Users Say Thank You to Skip Fix For This Useful Post: | ||
#149
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seats
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following 2 Users Say Thank You to Skip Fix For This Useful Post: | ||
#150
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I don't know that much about these heads or what they say the CNC work will do. But the only time I have seen this on a CNCed head is when there is core shift.
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#151
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Skip's comment regarding the intake port height will become important depending on the intake manifold of choice...
Intake port 2.350-2.380. Compared to a FelPor1233 raised at the top. Going to need a taller gasket and a Torker 2 or tomahawk will probably need welding at top. A fwiw, without welding both a Holley Street Dominator intake and a Tomahawk intake will go about 2.300" tall on the port height with about 1/8-inch above for sealing. Below is an example of welding a Torker II intake in order to raise the ports for use on a cylinder head with very tall ports: https://www.motortrend.com/how-to/cc...a-dcb8eba7ac8a .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE Last edited by Steve C.; 02-01-2023 at 05:02 PM. |
#152
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Some Core shift has been a common feature on these SM heads from what I have read so far.
And most all others too - as cast. I'm thinking the CNC work is mostly about "anti-doting" that feature up to a better degree. Anything else they pick up in the balance is gravy. Should be a quieter port now and likely higher flow numbers That's a lot of head for 1500 - I don't care which ho' house you go to ! |
#153
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If intake modding is going to be a full requirement , they reached too far on my scale.
That's race stuff territory. Suppose the intake port on the head could be epoxied instead ? Thats still unforseen work involved for just a hot street car build around 500 hp |
#154
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Quote:
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#155
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Those seats look much better than a lot I've seen.
.
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#156
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Quote:
PS: I haven’t had any issues with it sealing Butler sells intake gaskets can’t remember dimensions, that work for taller port.
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Last edited by Gach; 02-01-2023 at 05:56 PM. |
#157
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My only other concern would be once these heads are bolted on block, how much of a port miss match there would be. If you’ll be cutting the intake or the heads, to make them match up. May have to use a double thick intake gaskets, Butler also sells them. So what I’m saying all this is all well and good, but this is something you won’t know until you actually bolt them to a block and try to match intake up to the heads. Could to be very interesting
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#158
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Butler suggested intake gasket for their wide port heads...
Pontiac Wide Port Intake Gaskets 2.48 X 1.48 https://butlerperformance.com/i-2445...pm-5420-2.html Side note on intake manifolds for their wide port heads: "Aftermarket intake manifold choice is presently limited to our custom sheetmetal or a Wide Port-modified Edelbrock Victor, BOP Engineering's cast-aluminum four-barrel, and Wenzler's Gutsram" . .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE Last edited by Steve C.; 02-01-2023 at 06:38 PM. |
#159
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Kinda interesting to know if their "copy" of the Tomahawk manifold they sell will work with their CNC ported heads.
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The Following User Says Thank You to PAUL K For This Useful Post: | ||
#160
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CNC =
Intake port 2.350-2.380 and 1.185 wide. Can anyone measure and post what the as-cast versions measure ? In retrospect - who was it that guesstimated 320cfm zone on CNC ? Was it Randy R. ? Don't know who else would have been in position to give an estimation previously. ** Error on my part using 280cfm as-cast earlier , its 289 (290) 30 +/- extra cfm seems like more than just trueing up and flattening out the wobbles and ridges … and it makes sense too , from a marketing point that will be based against a number (eventually). This will be fun to follow. Last edited by Baron Von Zeppelin; 02-01-2023 at 07:01 PM. |
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