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#41
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Lee, glad to hear from you! What's new??
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#42
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Hey Skip! I don't want to hijack the thread, so I'll go post something quick in the lobby....
Lee
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust |
#43
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re 6x head
here is a 6x4 i worked. i laid the edge back on the intake side. i also opened the chamber on the pushrod side of the intake valve. it flows 270@ .700" with a warrior intake and 1050 carb attached. i had 50* seats cut for the intakes with a 2.18" tit valve and 5/16" stem. i believe the 50* seat helps the flow to .700". the exhausts are 1.70" tit valves 45*seat and 206cfm at .700". the reason i laid these edges back on the intake side was i felt the steep seat angle would enhance the flow at mid to higher lift. also just below the seat i opened the bowl to 1.88" to help the bigger 2.18" intake and the 50* seat. i do NOT recommend this for a typical port job as things are getting thin in this area. one better have a cut up head to check to see just how far into the bowl you can cut. i also did the Darin Morgan "pro stock trick" in this area. hehe...
just for kicks chambers on a sc and ra iv head also..... the 6xs were not finished when the pic was taken. sorry for the blurry pic also.
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds Last edited by J.C.you; 12-18-2006 at 11:56 PM. |
#44
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Any experience yet with those 'Singh' grooves?
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#45
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top secret "trick"
not yet on the singh groove, close tho.
here is the "pro stock trick", since my pic was fuzzy and some might have a itch to know. it's a secret, so don't tell anyone... Morgan says this mod pics up hp and i am sure he has tested on the wet flow bench. it won't work on a pontiac tho....hehe...
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds |
#46
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J.C.you
Have you moved the pushrod holes on that 6X head ?? Looks like and aluminium insert with epoxy and the hole relocated rather than just sleeving the existing hole and porting through ?? Can you post results and methods used, improvement over std location, amount of offest etc and what they picked up in flow (if any) and gain in x-sectional area at the pinch Sorry, probably asking alot but were looking into trying this on a couple of test heads. You may save me the time and grief Cheers
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Working on going faster (and now staying dry at the same time !!) |
#47
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re mods
455 yes, the pushrods holes have been relocated. i used offset lifters to move the pushrods over. flow testing with clay in the port was done without the pushrod bulge, max area at the short turn, bowl cut, and the 50* seat. to remove the pushrod bulge in a typical port job would be a mistake IMO. port velocity and hp will suffer. BUT, with a highly modifed intake with carb attached, flow and acceptable velocity in the port is enhanced. i tried the 50* seat because there probably hasn't been much, if any, testing with a dport head. the flat chamber floor would not seem to work well with a steep seat angle. this is why i cut the "quarter moon" and pushrod side of the chamber back to become more of an "extention" of the seat angle.
for a practical build/port job i wouldn't recommend doing these things. you can sink alot of time/effort/$ in a set of iron castings when it is so much easier to "bolt on some aluminum hp". if your class requires a iron head, and you are looking for a max hp potential head, i would go with a ra iv casting if possible.
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds Last edited by J.C.you; 12-19-2006 at 10:42 PM. |
#48
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Almost finished with 1 head
Only did intake chamber area as per Jim Hands instructions.
Many hrs. involved, but worth it!
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https://www.flickr.com/photos/197745168@N07/ "There's nothing more unsatisfying than watching an electric car go down the dragstrip." |
#49
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Almost ready
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https://www.flickr.com/photos/197745168@N07/ "There's nothing more unsatisfying than watching an electric car go down the dragstrip." |
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