1971 Buick 455 GS F/SA G/SA Build

[HP HUNTER]

Originally Posted by Glenn Briglio

Got any more dyno pulls with a broader range of rpm? Ie lower and higher.

I do have some tests I started @ 3800 but If I remember right I ran the car from 4200 to 5800 on the track. I really didn't want to run it past 5800 until I went through the engine, after its freshened you can be sure it will be run much higher than 5800, in fact I need more RPM to make the driveline changes I want to make. I do have the top end off the engine now and everything appears to be legal. When I look at whole combination of car and driveline and engine I can't imagine not being able to make it faster. I will mention while testing I leaned the carb down, I had a 67 jet with a .062 rod and it picked up from the race setup and I had no jets or rods to go leaner, I test @ 6400 feet elevation. I will look and see if I printed any of the tests starting @ 3800 RPM, if I have them I will post them.

[stage1scott]

Subscribed-always nice to see a Buick build. Jason Line still has his world championship GS and at the 4 wides last year (I believe) in C/sa as a 70 he posted some sub 10.50s. Line Performance would be my choice for help with a Buick stocker for sure.

[Glenn Briglio]

Originally Posted by HP HUNTER

I do have some tests I started @ 3800 but If I remember right I ran the car from 4200 to 5800 on the track. I really didn't want to run it past 5800 until I went through the engine, after its freshened you can be sure it will be run much higher than 5800, in fact I need more RPM to make the driveline changes I want to make. I do have the top end off the engine now and everything appears to be legal. When I look at whole combination of car and driveline and engine I can't imagine not being able to make it faster. I will mention while testing I leaned the carb down, I had a 67 jet with a .062 rod and it picked up from the race setup and I had no jets or rods to go leaner, I test @ 6400 feet elevation. I will look and see if I printed any of the tests starting @ 3800 RPM, if I have them I will post them.

Gear the car where the engine wants not where you want it to run.

[Carguy49]

What rear end gear is in the car now? You might be surprised how little gear a Buick needs. I know of a 455 Pontiac stocker (same theory as a 455 Buick) that only runs a 4.10 gear and will run in the mid 10's.

[Mark Yacavone]

Originally Posted by Carguy49

What rear end gear is in the car now? You might be surprised how little gear a Buick needs. I know of a 455 Pontiac stocker (same theory as a 455 Buick) that only runs a 4.10 gear and will run in the mid 10's.

Ron, The 455 Buick has a much shorter stroke and a bigger piston.
Just sayin'

[HP HUNTER]

Keep in mind I NEVER get in near sea level conditions. Glenn you've seen the previous dyno data how would run the gear stack? Gear ratio is 4.10 12 bolt.

[HP HUNTER]

Originally Posted by Mark Yacavone

Ron, The 455 Buick has a much shorter stroke and a bigger piston.
Just sayin'

I agree, in my line of thinking, first I need to get the car out of the hole, more gear, more converter, less internal trans weight, at this point I can deal with the first to second gear drop, but a 1.53 60 not going to get it done, theres lots more there. I believe a 4.10 gear could work in a 29.90 baro but I never see that. So with a 470 CU IN engine with head flow in the 220s @ 28" I think I'am going to concentrate on the heads and intake in that order after the short block is freshened with a modern ring pack.

[Dan Fahey]

Suggestion.
Check out Dick Millers website regarding your type suspension.

D

[HP HUNTER]

Thanks!

[Dion Hildebrandt]

Originally Posted by Dan Fahey

Suggestion.
Check out Dick Millers website regarding your type suspension.

D

Been there done that, it is good street car stuff.