Quote:
Originally Posted by Scarebird
C5's have a pair of 2" pistons per caliper - giving an effective area of 6.28". Rule of thumb for a car like yours would be to run 70% of the area in the rear, giving a piston of 2.36" diameter. Stock 79-81 rear disc use 2-1/2" pistons, ours uses 2-1/4" versus the smaller S10 rear calipers and are drum-in-hat.
Find out what diameter piston a setup has first before buying - too small will be ineffective, too large cause excessive lock up.
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The chart I looked at at listed the C5 front pistons at 1.75 inches. Scarebird knows his stuff, so if they are 2” then the LS rears are too small.
OP, sorry for the misinformation!
Murf
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