Chimera Posted May 5, 2019 Share Posted May 5, 2019 I know a guy who is building a "stage 2" motor with his 67 Riviera. He is purchasing "stage 2 heads & cam," this weekend. Any comments on the pros and cons? Also, what would that look like in the most correct historic sense? He said it would have 700HP, but that sounds like a lot to me... https://www.hemmings.com/blog/2013/02/05/buick-stage-2-prototype-saga-clarified/ http://www.v8buick.com/index.php?threads/factory-stage-2-heads.88540/page-12 1 Link to comment Share on other sites More sharing options...
RivNut Posted May 5, 2019 Share Posted May 5, 2019 Sounds like a whole lot to me. Both articles dealt with a 455 (67 is a 430) PROTOTYPE. Who knows what else was done to it other than heads. Neither article mentions the hp produced. I found this article and copied and pasted it here. With factory backing and a bunch of other goodies, the guys who built this Stage 2 1970 455 only claimed 500+ hp. Hopefully your friend is not buying parts claimed to give him 700 hp. Buick had its power-crazed engineers working on a successor to the Stage 1. Dubbed the Stage 2, this engine upgrade was meant to be a heavily upgraded 455. With improvements to 11.0:1 compression, forged TRW pistons, redesigned heads, and a valvetrain capable of 7000 rpm, the ultimate intent was to release the Stage 2 as a Super Stock racing package. It is estimated that the Stage 2 package was good for 500+ 2 1 Link to comment Share on other sites More sharing options...
Rivdrivn Posted May 5, 2019 Share Posted May 5, 2019 1 hour ago, Chimera said: I know a guy who is building a "stage 2" motor with his 67 Riviera. He is purchasing "stage 2 heads & cam," this weekend. Any comments on the pros and cons? Also, what would that look like in the most correct historic sense? He said it would have 700HP, but that sounds like a lot to me... https://www.hemmings.com/blog/2013/02/05/buick-stage-2-prototype-saga-clarified/ http://www.v8buick.com/index.php?threads/factory-stage-2-heads.88540/page-12 It could look something like this... 3 Link to comment Share on other sites More sharing options...
J3Studio Posted May 5, 2019 Share Posted May 5, 2019 (edited) How easy is it to add additional power to that three-year-only, allegedly 50 million dollar development cost 430 ci motor? How easy would have been back in 1967? Edited May 5, 2019 by j3studio (see edit history) Link to comment Share on other sites More sharing options...
Rivdrivn Posted May 5, 2019 Share Posted May 5, 2019 3 Link to comment Share on other sites More sharing options...
J3Studio Posted May 5, 2019 Share Posted May 5, 2019 (edited) "… an off-the-road package only!" Shameless. Edited May 5, 2019 by j3studio (see edit history) Link to comment Share on other sites More sharing options...
RivNut Posted May 5, 2019 Share Posted May 5, 2019 All this info is for the 400 big block in the GS400. An intermediate sized car that was hopeful of competing with the SS396 Chevelle and other similar cars in NHRA and IHRA sanctioned events. 1 Link to comment Share on other sites More sharing options...
Garysriv Posted May 5, 2019 Share Posted May 5, 2019 (edited) It amazes me that they used undersized bearings "that may cause clatter noise during cold starting" and note "run the oil 1 quart low to prevent foaming". Did they warranty the Stage 2 dealer option? Edited May 5, 2019 by Garysriv (see edit history) 1 Link to comment Share on other sites More sharing options...
PWB Posted May 5, 2019 Share Posted May 5, 2019 (edited) Don’t forget TA Performance. Those guys know and have almost everything. http://www.taperformance.com/ Edited May 5, 2019 by PWB (see edit history) 2 Link to comment Share on other sites More sharing options...
jsgun Posted May 5, 2019 Share Posted May 5, 2019 My uncle had a 390 in a AMX years ago that was build by a professional racer he knew. Massively ported heads and the biggest valves possible, 12:1 compression (or higher?), single plane intake, Holley 850 double pumper, solid lifter cam, blown out header mounted glass packs. It only made around 500HP. It was barely drivable, it was so ragged. Backyard builders are getting 700+ without blowers from GM's LS motors with the right parts. Maybe that's where he got the number from? I think he'd have to go blower or turbo and put some real money into the bottom end to make a big buick live at that level. 2 Link to comment Share on other sites More sharing options...
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