The great strength of the GMC 302 is low- and mid-range torque. For "a mostly weekend only street truck" you will probably be happier with the stock 4-inch stroke. You can safely bore the cylinders to 4.125 for 320 cid. Patrick Dykes sells "Venolia" pistons for the 302 in a range of sizes. They are probably the best choice for a street-driven truck. Ross and Arias sell racing pistons for the 302.
Patrick Dykes sells a Howard cam (228 @ .050) ground by Donnie Johansen on your core. You could also consult with Tom Langdon, who recommends a "dual pattern" grind that some people have apparently used successfully.
Chevrolet V8 valves (1.94 intake, 1.6 exhaust) can be installed in the 302 head. i am not aware of anyone running lump ports in a 302 head on the street. For a street-driven truck, two or three Holley-Webers or a single four-barrel carburetor should offer more than adequate performance and throttle response.
You should consider using a Chevolet V8 flywheel and clutch with a Saginaw or Muncie four-speed and a later differential. Your crank flange can be modified to accept the later flywheel.
There are several discussions of all these issues in the archives of this forum.
God's Peace to you.
d
Inliner #1450
