71Demon540
Well-Known Member
Something John (Pittsburghracer) and others really enjoyed on this site was taking a guess at what a new combo would run. I remember when @-Boosted- was making changes to Fred, there were a lot of posts on what the car would run with the changes he would make. So here it goes,
1971 Demon
2825lbs race ready (With driver)
4 link rear suspension w/anti roll bar
Coil over front suspension with upper and lower a-arms
Viking double adjustable shocks front and rear
Dana 60 w/ 4.56 gears
32x13.5W Hoosier slicks
727 w/2.28 first gear and trans brake
8" turbo action converter 6500 stall
New engine combo is 540" low deck Indy block
4.500 bore
4.250 stroke
Indy 440-1 heads
Indy single plane intake
1" HVH 4 hole tapered spacer
APD 1175 dominator
14.8:1 compression
.776/.752 111 LSA 285/296@.050
Kromer kraft headers 2"-2 1/8"-2 1/4" double stepped primary tubed with 4" collector
Old engine combo was a 528" low deck Indy block
4.500 bore
4.150 stroke
Same heads and intake
14.5:1 compression
AED 1150 dominator
Same camshaft
Same headers
Old engine ran a best of 5.43 @ 125mph and typically ran low to mid 5.50s in normal hot summer air. In any decent air it would go into the high 40s. When it spit out the 5.43, we were in very good conditions at a good track. It did it back to back so it wasn't a fluke.
I probably won't get to the track til mid-end of May to give results. But that is right around the corner.
So lets hear the predictions for the new combo and what guys think it will run...
Video of the initial fire up of the engine
1971 Demon
2825lbs race ready (With driver)
4 link rear suspension w/anti roll bar
Coil over front suspension with upper and lower a-arms
Viking double adjustable shocks front and rear
Dana 60 w/ 4.56 gears
32x13.5W Hoosier slicks
727 w/2.28 first gear and trans brake
8" turbo action converter 6500 stall
New engine combo is 540" low deck Indy block
4.500 bore
4.250 stroke
Indy 440-1 heads
Indy single plane intake
1" HVH 4 hole tapered spacer
APD 1175 dominator
14.8:1 compression
.776/.752 111 LSA 285/296@.050
Kromer kraft headers 2"-2 1/8"-2 1/4" double stepped primary tubed with 4" collector
Old engine combo was a 528" low deck Indy block
4.500 bore
4.150 stroke
Same heads and intake
14.5:1 compression
AED 1150 dominator
Same camshaft
Same headers
Old engine ran a best of 5.43 @ 125mph and typically ran low to mid 5.50s in normal hot summer air. In any decent air it would go into the high 40s. When it spit out the 5.43, we were in very good conditions at a good track. It did it back to back so it wasn't a fluke.
I probably won't get to the track til mid-end of May to give results. But that is right around the corner.
So lets hear the predictions for the new combo and what guys think it will run...
Video of the initial fire up of the engine