Sorry, I need to know. What is the difference between a GS455 and a GS455 Stage 1? Is it just the head work?
ADD: oil pickup tube, valve springs. Here's a visual representation of the stage1 package <img src="http://www.v8buick.com/attachment.php?s=&postid=35014">
Dang! Thats more than I thought. But, I guess it's possible to make a Stage 1 out of a GS455 hey? Anyone on here done it with success?
Sure.... It seems many people upgrade to stage 1, but more go beyond.:grin: :TU::3gears: My 71 dyno'ed at 450hp. Hey Marco after 70, all 455's got the larger 5/8 pickup.
On the 70 models, higher rpm governor. no wave plates in 2nd and 3rd clutch packs and the 3rd clutch piston was different on 6 clutch pack units. Valve bodys were setup for firmer shifts (1-2 accumulator valve spring removed and softer 2-3 accumulator) and shift plates were different. Some of these mods were carried over to 71 and later, but not as extensive as 70. Also, not all 70 Stage 1 trans had 6 clutch 3rd packs. The 5 clutch packs were used until a certain build date in both. Then both used 6 clutch packs with the Stage 1 units getting the special piston. At least this is what I have found on the ones I have worked on. Mark
Thanks Mark, I didn't know that. Was there any difference in the 3 or 4 speeds in the regular 455's and the Stage 1's?
