Post your 500hp+ Big Block combos

[72ScampTramp]

Show me your combos need some ideas please.

 

[1wild&crazyguy]

451 based on the 440 rod as follows....

11.1 comp ross pistons/pins
440 LY rods shot blasted/polished beams , bushed small end
stock oil pump w/mp spring w/block tapped for 1/2 pickup
soliD cam=XTQ492S-294*/299* ADV DUR - 264/270@.050 - .567/.579 LIFT - 108* CL
OR solid roller=306BR-306*ADV DUR - 273*@.050 - .625 LIFT - 108*CL

or if choose heads accordingly you could be a lot more street
=XR292R/292*/297*ADV DUR - 252*/260* @.050 - .582/.588LIFT 110*CL

440 source Stealth heads, I would work them some but they do the numbers ootb.

m1 single plane w/ 950 holley or street 830 annular holley

1 7/8 header pri tube would work.

 

[crackedback]

Josh, The build that got dynoed the other day with 10.5-10.75:1, single plane and larger headers would likely get better than 500hp. I noticed that the camquest program came up with 476 518 so it was VERY close to correct on my friends build using the small tube open exhaust.

That solid cam you have with a good single plane, stealths and 10.75 should get you over the hump easy.

Camquest with the same cam, 10.5, large tube headers open came up with 521/563
Large tube w/mufflers 518/547

Good mufflers won't hurt performance much...

 

[DonnieLawson]

451 based on the 440 rod as follows....

11.1 comp ross pistons/pins
440 LY rods shot blasted/polished beams , bushed small end
stock oil pump w/mp spring w/block tapped for 1/2 pickup
soliD cam=XTQ492S-294*/299* ADV DUR - 264/270@.050 - .567/.579 LIFT - 108* CL
OR solid roller=306BR-306*ADV DUR - 273*@.050 - .625 LIFT - 108*CL

or if choose heads accordingly you could be a lot more street
=XR292R/292*/297*ADV DUR - 252*/260* @.050 - .582/.588LIFT 110*CL

440 source Stealth heads, I would work them some but they do the numbers ootb.

m1 single plane w/ 950 holley or street 830 annular holley

1 7/8 header pri tube would work.

If your talking about the Comp Cams XTQ294S , Same specs as what you mentioned . Thats the cam I have in my 440 based 505 Stoker motor , 11.3 - 1 , CNC'ed stealth heads . 950 Holley and a Victor
Its not together yet..... One day...

Donnie

 

[72ScampTramp]

Josh, The build that got dynoed the other day with 10.5-10.75:1, single plane and larger headers would likely get better than 500hp. I noticed that the camquest program came up with 476 518 so it was VERY close to correct on my friends build using the small tube open exhaust.

That solid cam you have with a good single plane, stealths and 10.75 should get you over the hump easy.

Camquest with the same cam, 10.5, large tube headers open came up with 521/563
Large tube w/mufflers 518/547

Good mufflers won't hurt performance much...

Yep I figured that just seeing what some others are doing to get there thanks for your help Rob

 

[moper]

There's a million ideas to get to this level. Stroked combos, iron heads, flat tappets, roller cams, etc. With solid machining, decent (yet still reasonable cost) parts, and good matching of components it's really pretty easy to make 500hp/500tq from a pump gas 440. I've gotten results around 480hp/530tq using ported 516 heads, a hydraulic cam, and an iron 6bbl on pump fuel. BTW, peak torque on that one was at 3200rpm. So for your goals, I'd say stock block w/performance prep and main studs (meaning align hone, square deck, bore, plate hone) with a factory crank, factory rods, KB hyper pistons (or modern forged for a couple hundred more), internally balance it, file fit rings, a set of Stealths that have been checked and corrected and hardware upgraded, Set static compression to 10.75:1 with a quench of .035-.040. Stick in a solid or hydraulic flat tappet around 230-240° @ .050 and .560 lift, the intake of your choice (Id use an M1 or RPM depending on gear and convertor) and a carb around 850cfm dry flow rated, and you're at 500+ on hp and tq that will run on pump swill and last for years of abuse and crusing. Nothing fancy.

 

[72ScampTramp]

I guess I will post my build I have.

72 Scamp
440 .030 over
Stealth Heads
LY rods
Forged Crank
TRW/Speed Pro .030 10 to 1 comp
Pro-Parts headers
Weiend Tunnel ram with 2x600 prepped holleys
MSD Ignition
Gear Drive
Roller Rockers

CAM SPECS Lunati Solid Flat tappet
Advertised Duration (Int/Exh): 272/280
Duration @ .050 (Int/Exh): 243/251
Gross Valve Lift (Int/Exh): .546"/.566"
LSA/ICL: 110/106
Valve Lash (Int/Exh): .016"/.016"
RPM Range: 2400-6500

 

[72ScampTramp]

There's a million ideas to get to this level. Stroked combos, iron heads, flat tappets, roller cams, etc. With solid machining, decent (yet still reasonable cost) parts, and good matching of components it's really pretty easy to make 500hp/500tq from a pump gas 440. I've gotten results around 480hp/530tq using ported 516 heads, a hydraulic cam, and an iron 6bbl on pump fuel. BTW, peak torque on that one was at 3200rpm. So for your goals, I'd say stock block w/performance prep and main studs (meaning align hone, square deck, bore, plate hone) with a factory crank, factory rods, KB hyper pistons (or modern forged for a couple hundred more), internally balance it, file fit rings, a set of Stealths that have been checked and corrected and hardware upgraded, Set static compression to 10.75:1 with a quench of .035-.040. Stick in a solid or hydraulic flat tappet around 230-240° @ .050 and .560 lift, the intake of your choice (Id use an M1 or RPM depending on gear and convertor) and a carb around 850cfm dry flow rated, and you're at 500+ on hp and tq that will run on pump swill and last for years of abuse and crusing. Nothing fancy.

I realize there are many ways to do this, but the question wasn't how to get to 500hp. It was what are others running to get to these numbers. Proven combos is what I was after.

 

[moper]

Fair enough.
1. '68 440 HP, in 67 GTX street car, all steel, stock hood, 4.10s, 727 w/3500 stall convertor, best run 11.60s @ 115 IIRC. Pump high test.
Factory block, stock crank, rods, KB hyper flat tops .010 down in bore, true 10.8:1, My stage 2 ported 915s (around 270-280cfm w/2.14 intake valve) with matching M1, Holley 850DP, 1 3/4 cheapie headers, MP .528 solid cam.
2. '70 440 - '71 Cuda, 4sp, AC, Shaker, 3.54 Dana... weighed with driver at 4200lbs ran to 109mph with severe wheel spin. Previously rebuilt shortblock w/unknown type forged flat tops, otherwise stock rebuilt lower end, stage 2 516s (around 270cfm w/2.14 intake valve), 10.8:1, factory 6bbl iron intake and carbs, 2" Super Comp headers, Crane H-302-2 hydraulic cam. Pulled 465 pound feet at 3200 on chassis dyno.

Neither of these are what I'd call "top dollar" efforts and could be easilly duplicated with better results now.

 

[1wild&crazyguy]

Josh, those gear drives are great for accuracy but eat up a lot of hp= 20+ at this level.

maybe consider a a high quality billet gear chain set-JP performance/rollmaster/mancini..

jmo

 

[72ScampTramp]

Car Craft did a tech article some time back on Gear drives and compaired them to timing chains and Belt drives. From the looks of it there doesnt seem to be a HP loss over a timing chain.

http://www.carcraft.com/techarticles/ccrp_0510_camshaft_drive_comparison/jesel_belt_drive.html

 

[1wild&crazyguy]

well i stand corrected in that example.

 

[1wild&crazyguy]

oops

 

[72ScampTramp]

Im sure there are some variables that could change that maybe. But they tested it on a 440 Mopar of all motors. It looks like it loses a bit in average hp but I no dramatic drops.