head flow numbers.

[gtxrt]

it ran really good with those heads just wanted to get the .500 lift to 218-220 flow and .550 lift to 223-225. if it all it takes is to un shroud them. the numbers were really good to .400 lift then it seems they went bad.

 

[RemCharger]

I did a brief googlin, seems like most cams for those are in the .420-.430 range
Do you have a .550 lift cam for it??

 

[gtxrt]

they already been ported with bigger valves the flow numbers are good to .400 lift. koffel get the right numbers

let me reword this. even if koffels numbers are on the big side the .500 and .600 numbers were in the more normal range.

 

[gtxrt]

I did a brief googlin, seems like most cams for those are in the .420-.430 range
Do you have a .550 lift cam for it??

.430 was stock. am running .517 lift

 

[PRHeads]

Unshrouding the valves may help……….it may not.
And it could make things worse.

You’d want to confer with someone well versed in reworking those heads before going down that road.

 

[RemCharger]

.430 was stock. am running .517 lift

Lol that's what I'm saying . The head dictates the cam requirement.
It would be like stuffing a .650 cam in a stock 65 383. Or better yet, a slant 6.
"Go with the flow" as they say

 

[gtxrt]

well believe it or not the engine at 446 cubic inch made 430 hp and 550 tq at 3700 rpms. with a 230-235 solid lifter cam.

 

[gtxrt]

to make the best et I would shift at 5200-5300 rpms.

 

[RemCharger]

What did you get out of the old girl?

 

[gtxrt]

What did you get out of the old girl?

12.38 with a 2-speed trany and 3.23 gears 26 inch tire though. 1.5 exhaust valve. when i said shift not shifts at 5200-5300 lol

 

[RemCharger]

12.38 with a 2-speed trany and 3.23 gears 26 inch tire though. 1.5 exhaust valve. when i said shift not shifts at 5200-5300 lol

Extremely impressive

 

[gtxrt]

Extremely impressive

sold the car a few years back with a little more head work on different heads and a one size bigger cam 235-239 plus a few little other things never went back to dyno or track. maybe could have went to 12.2 et maybe on a good day.

 

[gtxrt]

it was a 425 cubic inch nail head bored .038 thou over and stroked from a stock 3.64 stroke to a 3.75 stroke =446 cubic inch sound familiar lol. went from a 6.22 stock rod to a chevy 6.535 rod.

 

[PRHeads]

Racing flow benches

 

[Ed Brock]

Could be. Flow benches just like dyno's have been known to vary from shop to shop. Porting is a science and some porting can take away if not done right.

Well said. A grinder does not make you a porter. Years of experience does however.