Tricked-out Chevy six cylinder engines

[TJ's Chevy]

Originally Posted by Husein-p

in ur opinion l6-250 engine with 4bbl holley carb + Headers + Lumping port How much horsepower can deliver ?
with standard cam shaft ....

All depends....
I can give an estimate. lol

With a 390 holley, headers(any kind), HEI and a lump port head with 1.86 intake valves and stock exhaust valves I'd say about 40 more hp than stock....so close to 170-180 hp I think. I don't remember the hp specs on the 250's as of now. You'd really be wasting time not adding a little more lift on the cam at least. I'd go a step over stock with a cam if I was doing a light build. Comp cams has some good grinds for cheap.