Originally Posted by
MidnightRider
wayyy steep the only difference in a newer 5.3 is active fuel management vally cover. for 1250 you can get a low miles 6.0 long block with intake.
Actually the newer 5.3s have better flowing heads, and the flat top pistons should give it a little higher CR.
1991 Silverado-L33 5.3L, 212/218 .557 .562 115+4, ASP under drive pulley,180* thermostat, 90mm truck intake w/ LS3 throttle body. Shoenfeld conversion headers and duel Flowmaster exhaust. Performabuilt LVL 1 transmission and 23-2500 stall converter.
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