1971 Buick 455 GS F/SA G/SA Build

[HP HUNTER]

Originally Posted by goinbroke2

Can't wait, I can imagine some must be concerned with you showing "secrets" lol!

Not sure about that. Heres the flow numbers on my stock 661 casting heads.

Intake flowed @ 28 inches 4.350 bore SF 600 bench

.200 120
.300 177
.400 207

Exhaust flowed @ 28 inches 4.350 bore SF 600 bench no pipe

.200 95
.300 124
.400 143
.460 149

As you can see I've got a real power maker here.............

[R. Thorne]

Where are the flow figures for .100 lift? Are these the heads off the car that have a "normal" 3 angle valve job or untouched as produced at the factory? As my post a few years ago mentioned I improved my low lift flow substantially at the expense of a small amount of loss at .400 lift. This helped my car measurably. Since that time i have done more experimenting with valve jobs, back cuts, etc. with surprising results. The oem valve seat is 45 degrees, right? I would try a 37 degree and lots of experimenting with "different" types of valves. Oh yeah, make sure the heads are cut close to minimum cc's before anything is done (saves surprises later). Ron.

[HP HUNTER]

Originally Posted by R. Thorne

Where are the flow figures for .100 lift? Are these the heads off the car that have a "normal" 3 angle valve job or untouched as produced at the factory? As my post a few years ago mentioned I improved my low lift flow substantially at the expense of a small amount of loss at .400 lift. This helped my car measurably. Since that time i have done more experimenting with valve jobs, back cuts, etc. with surprising results. The oem valve seat is 45 degrees, right? I would try a 37 degree and lots of experimenting with "different" types of valves. Oh yeah, make sure the heads are cut close to minimum cc's before anything is done (saves surprises later). Ron.

Great information, thanks, I will look for your thread.

[Glenn Briglio]

Originally Posted by R. Thorne

Where are the flow figures for .100 lift? Are these the heads off the car that have a "normal" 3 angle valve job or untouched as produced at the factory? As my post a few years ago mentioned I improved my low lift flow substantially at the expense of a small amount of loss at .400 lift. This helped my car measurably. Since that time i have done more experimenting with valve jobs, back cuts, etc. with surprising results. The oem valve seat is 45 degrees, right? I would try a 37 degree and lots of experimenting with "different" types of valves. Oh yeah, make sure the heads are cut close to minimum cc's before anything is done (saves surprises later). Ron.

Yes pay attention at low and mid lifts!!!!

[kansas stocker]

Maybe I'm missing something here. I thought valve seat angles had to be within 1 degree of the factory angle.
Pete

[R. Thorne]

That 1 degree refers to the valve inclination angle (I.e. the angle of the valve stem in the guide), not the valve seat angle. Any valve job is permitted as of (I think) 2009 in stock eliminator. Ron.

[kansas stocker]

Thanks. That changes my line of thinking.
Pete

[SSGN]

Nice car and great to see some Buicks out there. I remember this car when it was for sale a few years ago. Good luck and post up some pics.