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#1
03-10-2021, 02:00 PM
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3.23 would probably be OK, but I don't think that's available for a 12 bolt and I don't want to change whole rear end. I'm leaning towards the 3.08. If I go to a BFG Radial TA tire that's 26.6" tall, that would give me 2528 rpm @ 65 mph. That seems reasonable to me. I don't think I'll be doing much, if any, interstate driving so 65 mph is about the fastest cruising speed I'll see with any regularity.
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
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#2
03-14-2021, 12:11 AM
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Ok, I was just trying to help clarify what read to me as a misunderstanding of sorts.
I hope you thouroughly enjoy your TA 
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#3
03-14-2021, 01:14 AM
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Quote:
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
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#4
03-21-2021, 01:54 AM
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275 60 15's rear I think I used 235 60 15 frt. if you like
Leave everything as is and add a Gear vendors under overdrive. imo https://www.gearvendors.com/hrgm4sm.html Nice ride.
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https://www.flickr.com/photos/197745168@N07/ "Of all ignorance, the ignorance of the educated is the most dangerous. Not only are educated people likely to have more influence, they are the last people to suspect that they don’t know what they are talking about."Thomas Sowell Last edited by KS circutguy; 03-21-2021 at 02:12 AM. |
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#5
03-21-2021, 09:54 AM
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I love the look on reproduction period correct white letter tires, but in years bygone I did ply with different sized BFG radial tires;
I believe that the actual radial size for our cars was 225/70r15 - (which I believe is an F-70-15); I found that 235/60r15 was about perfect (and it should be, it's the reccomended size), but it also seemed a smidge small; I went next to 255/60r15's and found that mounted on 15x7" wheels they would baloon and wear from the center of the tread out; My opinion is the best modern radial size I found was 245/60r15, it's just a bit wider than the 235, it ever so slightly fills the wheel wells better than the 235, and there was no balooning effect. I also like the same width and profile on 14x7" wheels.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#6
03-21-2021, 10:41 AM
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I thought about the overdrive. Still considering all options but leaning heavily towards a 3.08.
 I know many will consider that sacrilege, but they did offer a 3.08 that year, just not with a 4 spd. Regardless, I need something for more comfortable cruising. And it's something easy to correct in the future if anyone wants to.I do like the period correct look of the Polysteel tires. They look great from the side, but too skinny otherwise. I'll probably go with the BFG's eventually. Probably the 245/60. Although, if I went with 15x8 rear wheels, then I could put 255s on the rear, hmm...
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear https://youtube.com/shorts/gG15nb4FWeo?feature=share |
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#7
03-25-2021, 06:39 AM
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Congrats, that is my dream car, and yours is beautiful.
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1969 Firebird, Tx3-455/468 machined by CVMS E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid 850DP on E-85 by Eric Niefert/T2 1" plastic spacer T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400 1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine) https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be 1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine) |
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#8
03-25-2021, 11:06 AM
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I had 3.31 in an M20 (400) car and I thought that was a good compromise.
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"If the best Mustang is the Camaro, the best Camaro is actually the Firebird" David Zenlea |
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