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08-28-2016, 10:49 PM | #1 |
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1971 Buick 455 GS F/SA G/SA Build
A few years back I bought a 1971 Buick GS 455 stocker 315/330 HP. After taking delivery of the car I rebuilt the rear suspension, changed the fuel system, rejetted the carb, put on fresh tires and headed for the track. I was surprised when the car ran 11.35 on a 11.85 index (F/SA) on a 2130 foot track with a 27.80 baro in July 4500 DA, although the car was 135 pounds light for F/SA. I put the car away for a few years but couldn't help but think the car had potential if the engine was legal. This last week I got the car out of the garage and pulled the engine and put it on the dyno, then a tear down to determine what I was working with. I will post pictures of my engine build as I go, I will be looking for 30 extra HP out of the engine, if I can get that I will then look very hard at the drive line. I can't help but think if I can get a few hundred more RPM peak out of the engine I can then gear up to a 4.30 gear with more converter. Any advice or information on this build will be appreciated. Dyno test as the engine was pulled from the car.
Last edited by HP HUNTER; 08-28-2016 at 11:06 PM. |
08-29-2016, 07:38 AM | #2 |
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Re: 1971 Buick 455 GS F/SA G/SA Build
Got any more dyno pulls with a broader range of rpm? Ie lower and higher.
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08-29-2016, 08:01 AM | #3 |
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Re: 1971 Buick 455 GS F/SA G/SA Build
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.
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08-29-2016, 09:32 AM | #4 |
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Re: 1971 Buick 455 GS F/SA G/SA Build
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.
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08-29-2016, 12:16 PM | #5 | |
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Re: 1971 Buick 455 GS F/SA G/SA Build
Quote:
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08-29-2016, 01:20 PM | #6 |
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Re: 1971 Buick 455 GS F/SA G/SA Build
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.
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08-29-2016, 01:51 PM | #7 | |
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Re: 1971 Buick 455 GS F/SA G/SA Build
Quote:
Just sayin'
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08-20-2017, 10:23 AM | #8 |
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Re: 1971 Buick 455 GS F/SA G/SA Build
The index at Denver for F is 12:60 would have been #1 qualifier at the last national with that run.
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08-20-2017, 10:56 AM | #9 |
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Re: 1971 Buick 455 GS F/SA G/SA Build
The F/SA index for Pueblo should be around 12.46 a run of 1.06 under at altitude is very impressive!
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08-20-2017, 11:27 AM | #10 |
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Re: 1971 Buick 455 GS F/SA G/SA Build
Great news
I know finding time is key Same here working on my velle and GS too. Better get outside now. |
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