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Old 09-19-2007, 11:27 AM
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Thumpin455_GTO Thumpin455_GTO is offline
Ultimate Warrior
 
Join Date: Jul 2004
Location: Marquette MI/York Ne
Posts: 1,748
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70 GTO 4200lbs race weight.

72 455 +.030 -
4.21" stock crank -.010/.010 balanced
cast pistons
resized cast rods with ARP bolts
Ported 5C heads/stock valves
UltraDyne 280/288 hyd / stock type lifters
stock rockers
RPM/Demon 850DP
Summit headers/ 4' length of 3" pipe with cheap Summit mufflers/no tail pipes
2004R/stock lock up converter
2.93 gears in Olds rear

BeCool aluminum radiator
Stock H2O pump
185 thermostat

best ET 13.51@105 best MPG with Qjet 25MPG, 16 city, 22HWY is normal

Recently swapped in a 12 bolt with Eaton Posi, and 3.42 gears. Have not raced it since.