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Old 01-14-2013, 09:51 AM
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bench race this..

I'm thinking of getting this engine

This engine consists of:
  • 1986-2000 style block, 1pc rear seal 4 bolt mains -(No mechanical Fuel Pump Provision)
  • Nodular Iron Crankshaft
  • Powdered Metal Connecting Rods
  • Hypereutectic Pistons
  • 9.4:1 Compression Ratio
  • Roller Camshaft-
  • Specs-
    • Intake Lift- .414"
    • Exhaust Lift-.428"
    • Intake Duration @.050"- 191
    • Exhaust Duration @ .050-196
    • Lobe Centerline-111
  • Vortec Cylinder Heads- 64cc,1.94" intake,1.50" exhaust
how are they getting away with 9.4 to 1 with iron heads?

then thinking of maybe changine the cam to this... (ideas welcome)

The duration at lash point in degrees (intake/exhaust) is 288/308; duration at .050" tappet lift (intake/exhaust) is 196/206 and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 431/451. Valve lash is zero/zero and lobe centerline is 109 degrees.

using a performer rpm intake a 3310 holley 750 vac 2nd carb
and headers,,
in a 71 c-10 308 gears
2400 stall in a 2004r

with either 26.7" tall tires or 29" tall..

ideas, welcome.. try'n to figure out if the cam choice will run on pump swill..
I know the cam in the engine will as every 96-2000(2002 van) 3/4 ton truck has it..

I'm wondering what the timing curve looks like in those trucks, as they use ecu, and I'll be use'n springs and wieghts, etc

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Old 01-14-2013, 11:09 PM
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Get away with it. Modern efi engine managment, and low rpm. You can run higher comp at 5000rpm versus 6000, depending.

A scan tool will show cutrve map if you can score a ride.

My c10 is a 305 has the performer cam, and is great for heavy driven truck. Similar to what gm chose for its roller cam , go figure. Vortec 906 heads. 3.73 28" tire 3000 stall. blower 9 psi. It moves real nice.
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