Quick rundown...
Chevy 250 inline 6
0.040 flat top pistons (255 cid) 9.5:1
Lump ports
1.84 int 1.60 exh valves
mild porting and blending on the head
Comp Cam 268H - 0.499 lift, 219 dur @ 0.050
Full Comp valvetrain
Offenhauser 4bbl intake
Holley 600 carb
stock exhaust manifold(for now), but have long tube headers
stock distributor with Pertronix Ignitor II ignition conversion
Pertronix Flamethrower coil and plug wires
Early Cadillac oil bath air cleaner gutted and converted to paper filter
Should be about 270 hp and 300 ft lbs of torque.
All broken in. I had trouble in the beginning getting it to run since I was trying to break in in with the stock intake and carb. It ran lean and would barely run, and ran hot too. So I ended up getting an Offy intake and new Holley 600 (my old 600 made it run like crap too). I wanted to try and wait on getting the new intake and carb since we're about to move, but I had to get it running good first. The new carb made ALL the difference in the world. I'll fine-tune it once the truck is drivable.
The engine seems to run and idle well. It has a nice lope and starts easy now. Again, the new carb made all the difference. Wish I would have done this from the beginning.
Chevy 255 startup and rev - 1 video Chevy 250 startup, idle and rev video Chevy 250 pic - 1 Chevy 250 pic - 2 
