[ChevLoRay]

In '69, the 307 was rated at 200 Horsepower (Gross) @ 4600 rpm's and 157 (net) @ 4000 rpm's. The torque rating (gross) was 300 ft lb @ 2400 rpm's, while the net torque rating was 260 ft lbs @ 2200 rpm's.These are values for the CE 20 and KE 20 trucks. There was a slight increase in the net values, compared to the 10-series trucks, but the difference seems to be at the rpm at which the rating was taken.

The Truck Data Book for April 1, 1969, says "Net horsepower and torque were obtained from a dynomometer test simulating actual operating conditions when the engine is in the vehicle."

For comparison, gross values are done without any exhaust system, no fan, generator (alternator) not charging and "optimum spark advance".

With a bore and stroke of 3 7/8 X 3 1/4 inches, a compresson ratio of 9.0:1, and a stingy 2-bbl carburetor, they weren't built for speed/power, just an upgrade from the 250 6-cylinder.

I guess any engine can be "made to run", but the question begs an answer to how badly do you want THIS engine to run. Are you into restoration, or, do you have an end-plan in mind? If the answer is that you simply want a reliable V-8, why not go the cheap route and get a Goodwrench crate 350? They're around $1400, with a 36 mo/36K mile warranty. Labor, of course, is extra.

As for an HEI, there are plenty in the junkyards, but you should be careful with them. While you may find one that is outstanding, you may end up with one that needs rebuilt. The wiring can be brittle, especially the wiring to the pick-up module. Worn bushings can be a problem. Not gonna say it won't work, but my experience is that it doesn't hurt to spend the money for one that is already rebuilt (+ core charge) or do like I did. I bought one from Accel, that they had rebuilt. I got it from O'Reilly's. Seems like it was around $110. I have no regrets, either. Compared to the trouble that I was having with the junkyard HEI, the other folks on the highways are happier with my choice, too. Having it break down at inopportune times, really sucks.