11-28-2008, 20:19
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#2 (permalink)
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Moderator 429/460 Fanatic
Join Date: Sep 2004
Location: San Francisco Bay Area
Posts: 475
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Re: High altitude 460
Quote:
Originally Posted by Hoggy
... 76 ford van that has a 4x4 conversion on it. 460 C6 NP205 early Dodge Dana 60 rear end w/ 4:10 gears and low pinion Dana 44 in front w/ Chevy 1 ton calipers and rotors. Tires are 36-12.50-16.5
What I would like to do is build a donor motor to replace the old one. I want to maximise tourque more than anything. This van is usualy loaded or pulling a loaded trailer. Lotts of steep hills here.
Any sugestions for cam carb and intake would be apreciated.
I intend to start out by replacing timing gears to 0deg and am also looking for a better distributor.
This will be a low rpm engine that will not see much above 4500rpm too often at all. Last time I spun it above 4500 was pulling some guy out a ditch in the snow. at 65mph my tach reads 3200rpms. So I would like to put together a combo that will maximize torque for pulling these long mountain roads.
thanx
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Assuming 460 and not a stroker: - Your 1976 engine has a rotating assembly that puts the pistons a ridiculous 0.040" in the hole at TDC. This is not good for detonation control, especially with the loads the engine will endure in your particular case. My advice is to zero-deck the block when you rebuild the engine. Assuming you use OEM-style rebuilder pistons (which is fine in your case), the typical 460 rebuilder pistons have around a 24cc dish and, at zero deck, will have about 8.3:1 compression ratio with the D3VE-A2A heads. If you want a little more compression, then you can select the 1988-1992 460 EFI OEM-style piston (smaller dish volume) which will put you closer to 9.2-9.4:1 compression ratio with the D3VE-A2A heads (maybe that is not too much c/r at 7500 ft altitude?)
- Bowl blend the intake bowls, bowl blend the exhaust bowls, smooth the short turn radius transition from exhaust bowl-to-exhaust port, remove Thermactor bump from roof of port (DO NOT raise port roof, just grind/smooth away the bump), 3-angle valve job.
- Original intake, Holley 750 cfm carburetor.
- Camshaft: Comp Cams XE262H (34-238-4) (<---with the 460 dish pistons) or Lunati 90460LK (<---with the 88-91 EFI 460 pistons)
- Inexpensive double-roller straight-up timing chain
- Recurved OEM Ford Dura-Spark electronic distributor and control box
- Dual exhaust
Paul
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