Originally Posted by kennyhammond
Sorry just looked and I missed spelled some words in my post..... first all its a 98 block out of. 3/4 ton..... don't know if that matters
Kenny, here's the specs for a 3/4 ton Vortec engine from the Pace Performance website:
1986-2000 style block - (No mechanical Fuel Pump Provision)
Nodular Iron Crankshaft
Powdered Metal Connecting Rods
9.4:1 Compression Ratio
Intake Lift- .414"
Intake Duration @.050"-191
Exhaust Duration @ .050-196
Vortec Cylinder Heads- 64cc,1.94" intake,1.50" exhaust
These specs are pretty much what techinspector1 quoted so your typo didn't really change anything. The Vortec engines are pretty well spec'd for torque as they come from the factory, and even in stock form will be a big step ahead of any SBC that Chevy put in an '81 C10. One thing to remember is that the Vortec heads are limited to .475" lift in factory form so cam choices are limited unless you have the heads modified for increased lift. But there are still cams that would be an upgrade. Howard's #180225-12 .450/.465 lift, 260/266 advertised duration, 207/213 @ .050" duration, *112 lobe spacing from their "Max Factory" line of cams would be a step up from stock, and should work with the stock Vortec heads. Use a dual plane manifold along the lines of an Edelbrock Performer, your choice of 600-650 cfm carb, and 1 5/8" headers like VARS_85MONTE recommended.