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ta76
Tribal Scout

USA
9 Posts

Posted - 10 Feb 2018 :  7:50:59 PM  Show Profile  Reply with Quote
Im in the final stages of a 76 455 4 speed frame off resto. Im wanting to use 1990 16" wheels on my 76 but im not sure if they will fit the 76 has front disc and came with rally 2 but nit sure of the back spacing. Has any one tried this

thanks

Bill Boyle
Horse Feathers (Charter Member)

USA
5288 Posts

Posted - 12 Feb 2018 :  11:54:12 AM  Show Profile  Visit Bill Boyle's Homepage  Reply with Quote
Are you thinking about the 16" x 8" factory style GTA alloy rims? If so, the bolt pattern is 5 x 4.75" and that matches the pattern of the Rally II rims.

According to Classic Industries, 1st and 2nd generation Firebirds require a zero offset on the GTA Alloy rims and that equates to 4. 375" (4 3/8") backspacing.

15" Rally II wheels can be 7" or 8" wide. The 7" has a 4" backspace; the 8" has up to 4.50". You need to measure the backspacing on your current Rally II rims and go from there.

Note: the wider the rim the larger the backspacing.

"Dedicated to keeping the classic Pontiac engine alive."

----
400 bored +.030, forged TRW pistons, ported 62 heads, Hedman headers, 2.5 SS dual exhaust X Pypes, Comp 276AH10 cam, Scorpion 1.65 RR, 850 Q-jet, stock intake & tuned HEI; original owner.
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ta76
Tribal Scout

USA
9 Posts

Posted - 12 Feb 2018 :  10:26:43 PM  Show Profile  Reply with Quote
Thanks for the reply, I think it can be done and the unknown right now is the tire/wheel well clearances especially on the fronts
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Phil
The Great White Buffalo

USA
7302 Posts

Posted - 18 Feb 2018 :  4:22:08 PM  Show Profile  Reply with Quote
You'll need 4 "fronts" as those 3rd gen wheels have different offsets front to rear. They are marked from the factory for easy identification. The rear wheels have less "dish" and will set too far inside the wheel well on your second gen.

Bowties are for Pee-wee Herman. LS swaps in Pontiacs should only apply to Fieros.

Edited by - Phil on 18 Feb 2018 4:24:16 PM
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