1971 Buick 455 GS F/SA G/SA Build

[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.

[HP HUNTER]

I have the complete engine torn down, block and crank cleaned. What I've learned: the 661 heads flow about the same as the 149 castings which is good because they seem to be very hard to come by, I have bearing clearance issues to deal with on the mains, the cam tunnel has been opened up on the high side of the spec, hopefully a coated bearing will help there. Rods are stock Buick with Venolia pistons, some deck heights to deal with, seems I have something I can work with here.

[HP HUNTER]

Originally Posted by 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.

Here you go.....