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-   -   B/PS lt1 formula (https://classracer.com/classforum/showthread.php?t=49802)

ss3011 10-12-2013 06:19 PM
Re: B/PS lt1 formula
 
I think GM actually made a spacer for production vehicles to use a 298 mm converter with an LS engine. I don't have access to any parts books, but should be something a good GM parts guy could look up. I think they were used on LS, F-bodies.

Mark Yacavone 10-12-2013 06:22 PM
Re: B/PS lt1 formula
 
Quote:
Originally Posted by gbur (Post 404047)
Just curious as approx. When I drop the trans tomorrow (Sunday) will measure it for myself. Having my lathe sure comes in handy. Thanks for the info so far
Best I can find on a Saturday lol... .550...That's a lot of pilot extension....
Why I say a crank adapter would be better...

gbur 10-13-2013 11:21 AM
Re: B/PS lt1 formula
 
Quote:
Originally Posted by russellauto1 (Post 403614)
I am building a 93 formula with an lt1 for pure stock ihra and I am looking for some opinions on Torque converter and rear gear for that combination. As far as the converter, What stall range should I be in? RPM range of the engine is probally only 5500. Advantages, If any, of having the lockup disc in the converter. The transmission is a 4l60. What rear gear is suggested? I was thinking of a 4.10 or 4.56 with 28" tall tires. . Thanks
Felt a need to apoligize for invading your thread yesterday with my own question GB

russellauto1 10-13-2013 01:44 PM
Re: B/PS lt1 formula
 
Rule book is unclear about rear suspension. Are we allowed to replace the lower control arms and the the track locator bar with aftermarket? And What about Frame connectors ? Also the torque arm. I want it off of the rear of the trans. Are we allowed to build a support for that as long as it is part of the trans crossmember? ? I know I saw a 70s camaro with slapper bars at Norwalk a few years ago so I would assume you can use them for Leaf springs. Thanks Aaron

Robert Swartz 10-13-2013 05:32 PM
Re: B/PS lt1 formula
 
Quote:
Originally Posted by russellauto1 (Post 404145)
Rule book is unclear about rear suspension. Are we allowed to replace the lower control arms and the the track locator bar with aftermarket? And What about Frame connectors ? Also the torque arm. I want it off of the rear of the trans. Are we allowed to build a support for that as long as it is part of the trans crossmember? ? I know I saw a 70s camaro with slapper bars at Norwalk a few years ago so I would assume you can use them for Leaf springs. Thanks Aaron
russell,

If this is a IHRA Pure Stocker. I know Joe Marcinowski out of Cleveland, Ohio ran "bolt in" frame connectors on his late 70's Camaro when he ran P/S. Pretty sure he had slapper bars as well. As far as removing the torque arm on a later Camaro, may have to question someone with IHRA tech info. Contact Mike Baker or the Division Director, they could give you an answer.

Tar Heel 10-13-2013 08:12 PM
Re: B/PS lt1 formula
 
Quote:
Originally Posted by Robert Swartz (Post 404185)
russell,

If this is a IHRA Pure Stocker. I know Joe Marcinowski out of Cleveland, Ohio ran "bolt in" frame connectors on his late 70's Camaro when he ran P/S. Pretty sure he had slapper bars as well. As far as removing the torque arm on a later Camaro, may have to question someone with IHRA tech info. Contact Mike Baker or the Division Director, they could give you an answer.
Good advice. Mike Baker is usually pretty good about returning emails with such questions. I'm going to guess that everything you asked about is going to be legal.

Let us know when you find something out.

Scott

KennyAnderson 10-13-2013 11:12 PM
Re: B/PS lt1 formula
 
Interested to get the official word. From what I gather some is legal some not. If it has heim ends and is "ultra adjustable" its a red flag in tech. I plan on using the stuff that has poly bushings and appears close to stock. If I can put in a Strange/Moser 12 bolt there has gotta be some leeway. I plan on weld in subframes and a moly 6-point as well.

gbur 10-20-2013 10:16 AM
Re: B/PS lt1 formula
 
Quote:
Originally Posted by Mark Yacavone (Post 403997)
No difference in count ..both 30 spline ..Difference is in the length
Stator support shaft...all the same in modern GM transmissions ..Again, different lengths and placement
But maybe for your info , convertor hub dia is .130 difference


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