Some were curious on the 403 dyno results from Friday:
430hp @5500rpm and 471ft-lbs at 4100rpm, my guess was 430/475, not a bad guess
Specs: 410.6 ci, 9.789:1 final CR, includes top ring piston to cylinder wall gap otherwise it was 10.2:1 prior to final assembly
.030 cometic gaskets
#6 heads shaved to 57cc, .080 cut from Performer RPM intake to compensate...
fully ported, large valves flow 262/186 @.600, ported by Dick Stolpa of Rocket Racing, flow better than C heads
HS rockers, Smiths Bros push rods, modified Comp Cams guide plates for 7/16 studs
330 forged steel crank
Lunati Voodoo cam 219/227 .499/.510
Quick fuel 650
7 quart pan and HV Oil Pump
Unfortunately its not going into a G-body, I built this engine for a '77 Pontiac Can Am, 1 of 42 high altitude cars that was originally equipped with an Olds 403
I did build the driveline to with a G-body in mind: 3.73 posi, TH2004R, CK Performance billet HS converter
and cant forget the Lightning Rods...
One of the dyno runs to 5k rpm:
430hp @5500rpm and 471ft-lbs at 4100rpm, my guess was 430/475, not a bad guess
Specs: 410.6 ci, 9.789:1 final CR, includes top ring piston to cylinder wall gap otherwise it was 10.2:1 prior to final assembly
.030 cometic gaskets
#6 heads shaved to 57cc, .080 cut from Performer RPM intake to compensate...
fully ported, large valves flow 262/186 @.600, ported by Dick Stolpa of Rocket Racing, flow better than C heads
HS rockers, Smiths Bros push rods, modified Comp Cams guide plates for 7/16 studs
330 forged steel crank
Lunati Voodoo cam 219/227 .499/.510
Quick fuel 650
7 quart pan and HV Oil Pump
Unfortunately its not going into a G-body, I built this engine for a '77 Pontiac Can Am, 1 of 42 high altitude cars that was originally equipped with an Olds 403
I did build the driveline to with a G-body in mind: 3.73 posi, TH2004R, CK Performance billet HS converter
and cant forget the Lightning Rods...
One of the dyno runs to 5k rpm:
Last edited: