how do you build a 460 to make horrindous amouts of torque way down low? i read some where someone had one tha made 550 ftlbs at like 3000ish rpms. it doesn't need to rev over 4000 or so. would like low comp, for cheap gas. what kind of combo would i need? thanks
429 or 460 short block. Factory passenger car conn rods..
C/R from 9.0 to 1 to 9.75 to 1
non ported D0VE-C iron heads
edelbrock performer intake with holley 750 vac secondary carb
Factory dura spark distributor 14 initial and 24 centrifugal for a total of 38 degrees timing.
Comp dual energy cam 206 / 218 @ .050" lift. .497" / .502" lift on a 112 LSA. You can substitute the XE256 H in the comps extreme energy line. Just be carefull of C/R
Factory exhaust manifolds with duals 2 1/4" and H pipe.
160 degree t-stat
Dual snorkel air cleaner.
Factory rail rockers converted to be adjustalbe.
Test done with a 3 x 14" K&N aircleaner
Combo will require 89 to 92 octane pump gas depending on C/R
Chassis dyno numbers are 454 pound feet @ 1,500 RPM and 260 RWHP at 4,500
Ported heads are worth 20 HP as are headers. This is a high torque stump pulling combo.
.030 over stock block
9.5 CR with port matching, bowl blending, and minor porting
750 CFM vac secondary carb
Weiand Stealth intake
Crane Powermax hyd roller 311-2S-12
Long tube headers with primaries in the 1-3/4" to 2" range
I just rolled back from the dyno, '77 4x4 with a 460/C6, 4:11's and 33x12.5's. I made 350HP and 500 ft./lbs of torque at the rear wheels. '77 block 60 over, 10.5 milled TRW's on Eagle SIR rods, DOVE C heads ported and larger valves, COMP valvetrain and 294 solid cam, Edelbrock Performer RPM with 1" spacer and 850 Demon. Stan's Tri-y headers with 2.5" dual exhaust through flowmasters. With the low ratio gear set in the tranny the truck really launches and screams to over 6 grand. Not the most sedate vehicle but what a fun toy.
Corrected using a 22% driveline loss that comes out to theoretical rear wheel max numbers of 352 HP and 473 lb-ft torque. Darned close to what you actually made at the dyno! I'm glad to see that the error was an under estimation of actual torque and not the opposite.
The biggest thing with the D/D's is headflow numbers... the computer will guesstimate close, but with accurate flow numbers, its almost dead on, as for the 9.5:1 pulling a trailer, there should be no problems at all there