LT1-LT4 Modifications 1993-97 Gen II Small Block V8

If you haven't done this upgrade to your LT1 F-Body, you should (LS1 front brakes)

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Old 03-05-2015, 08:56 AM
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Originally Posted by maybe2fast
I have C5 fronts and LT1 rear and stock MC
Yep. Me too, and was running around 11" of vacuum and still had great stopping power. Completely unnecessary to do the rears, IMO.
Old 03-05-2015, 09:28 AM
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Originally Posted by Puck
The weight loss is nice, but IIRC you can't run 15" skinnies with the LS front brakes .

Worth mentioning for a drag car or street/strip build that sees a lot of track time.


Thank you for mentioning this. I was getting all exited about doing this now but she is on skinnies full time now.
Old 03-05-2015, 09:59 AM
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I had to upgrade to LS1 rears because you cannot run stock brakes on a Moser rear with tapered wheel bearings.
Old 03-05-2015, 09:59 AM
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Originally Posted by transbird95
Thank you for mentioning this. I was getting all exited about doing this now but she is on skinnies full time now.
Like I said, it works just fine. I personally witnessed my current prostars on an LS car, they will work. I run a 5/16" spacer to clear my stock brakes however, same thing on my buddies LS car. LS cars have been running 15" skinnies for years.
Old 03-05-2015, 10:01 AM
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Originally Posted by 93M6Formula
Like I said, it works just fine. I personally witnessed my current prostars on an LS car, they will work. I run a 5/16" spacer to clear my stock brakes however, same thing on my buddies LS car. LS cars have been running 15" skinnies for years.
I actually like the offset of spacers in the front with the wheels at a wider stance. Makes it look meaner, IMO.
Old 03-05-2015, 10:08 AM
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Originally Posted by 93M6Formula
Like I said, it works just fine. I personally witnessed my current prostars on an LS car, they will work. I run a 5/16" spacer to clear my stock brakes however, same thing on my buddies LS car. LS cars have been running 15" skinnies for years.
Hell yea, didnt see your post thanks!
Old 03-05-2015, 10:14 AM
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Originally Posted by SS RRR
I actually like the offset of spacers in the front with the wheels at a wider stance. Makes it look meaner, IMO.
I agree, it does look real good.
Old 03-05-2015, 10:36 AM
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What weighed less?
Old 03-05-2015, 11:00 AM
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Originally Posted by sweetbmxrider
What weighed less?
I'm at work right now but when I get home I will see if I can find my notes with specific weights.

What I do know off hand is that the LS1 calipers are made from aluminum while the LT1 calipers are made from steel. If you pick them both up you can feel a noticible weight difference. The LS1 spindles have a little less material on them than the LT1 spindles do so there's a slight difference there.

Last edited by StealthFormula; 03-05-2015 at 11:11 AM.
Old 03-05-2015, 11:19 AM
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nice write up! i have everything to do this swap except warm weather... cant wait to get this done!
Old 03-05-2015, 12:23 PM
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Originally Posted by hyperzone
Im about to pull the trigger on the vette brakes conversion... Im also concerned with the possible need adjusting or upgrading the rears as well... soo... the consensus seems to be its not going to be a problem... any nay sayers to that? Are ls1 rear brakes bigger?
The car looks good man.
Old 03-05-2015, 12:59 PM
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Nice write up!
Old 03-05-2015, 02:07 PM
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Check your local junkyards, at one time I was picking up both front spindles, rotors, calipers the whole thing for $100 a pop, just bolted them on then I think I had to get an alignment.
Old 03-05-2015, 09:50 PM
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Change all the fluid while you're in there. Oh yeah, and Hawks pads have been great on mine.
Old 03-06-2015, 10:08 AM
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Originally Posted by StealthFormula
I'm at work right now but when I get home I will see if I can find my notes with specific weights.

What I do know off hand is that the LS1 calipers are made from aluminum while the LT1 calipers are made from steel. If you pick them both up you can feel a noticible weight difference. The LS1 spindles have a little less material on them than the LT1 spindles do so there's a slight difference there.
Cool thanks. I figured the calipers were the most of it, just curious on the comparisons.
Old 03-07-2015, 02:48 PM
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Some weight measurements for anyone curious:

Stock LT1 Rotor = 5.9 lbs
Stock LS1 Rotor = 7.9 lbs

LT1 Spindle = 14.1 lbs
LS1 Spindle = 11.3 lbs

LT1 Caliper = 12.5 lbs
LS1 Caliper = 8.1 lbs

Total weight of LT1 setup = 65.0 lbs
Total weight of LS1 setup = 54.6 lbs

Converting from LT1 front brakes to LS1 front brakes save ~5.2 lbs per side for a total savings of ~10.4 lbs. Not the #1 reason why someone would complete the conversion but a nice additional benefit. *Brake pads were not weighed because the difference is negligible.
Old 03-07-2015, 04:46 PM
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Thanks for taking the time to weigh everything. I did the conversion a couple of years ago and didn't think to weigh the parts. But I'll take 10 pounds and better braking any day.
Old 03-08-2015, 09:29 AM
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Losing 10lbs of unsprung mass and getting better brakes for $100, can't beat it.
Old 03-09-2015, 10:57 AM
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Thanks for posting the weights.
Old 03-10-2015, 06:06 PM
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I'm running a 1/4" spacer from Aerospace Components on all 4 corners, the 15" Draglites with the spacers clear everything just fine, I didn't grind anything. I did the front brake swap back in 2005? Been quite a while back.


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