[Skip Fix]

Lee, glad to hear from you! What's new??

[Lee]

Hey Skip! I don't want to hijack the thread, so I'll go post something quick in the lobby....


Lee

[J.C.you]

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.

[Jack Gifford]

Any experience yet with those 'Singh' grooves?

[J.C.you]

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...

[455-4+1]

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

[J.C.you]

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.

[KS circutguy]

Only did intake chamber area as per Jim Hands instructions.
Many hrs. involved, but worth it!

[KS circutguy]