69 RS Gold / White Hat Original White Interior

[x Baldwin Motion]

A 307 cu in (5 L) version was produced from 1968 through 1973. Engine bore was 3.875 inches (98.4 mm) with a 3.25-inch (82.6 mm) stroke.

The 307 replaced the 283 in Chevrolet cars and produced 200 hp (149 kW) SAE gross at 4600 rpm and 300 lb·ft (407 N·m) of torque at 2400 rpm in the 1960s. The later emissions-modified versions produced just 115 hp (86 kW) SAE net, giving the engine one of the lowest power-per-displacement ratings of all time . Chevrolet never produced a high-performance version of this engine, though they did produce, for Outboard Marine Corporation, a high-performance marinized 307, rated at 235 hp (175 kW) and 245 hp (183 kW) SAE gross, depending on year, that shipped with the Corvette/Z-28's cast aluminum valve covers and Rochester QuadraJet carb. Chevy also built other versions of the OMC 307 rated at 210 hp (157 kW), 215 hp (160 kW) and 225 hp (168 kW) SAE gross.

One of the biggest myths about the 307 is that all the blocks were cast with a very low nickel content. However, some 307 blocks, such as casting number 3970020 with suffix VxxxxTHA (x's in place for date), had 010 and 020 stamped under the timing chain cover indicating high tin and nickel content.

[JJEH]

Wow... many thanks for the detailed posting

Sounds like a very economic Engine the 307...

Maybe the Reaction of the Oil Crisis in 1973?

[danachevroletfor1967]

I love the looks of that car. I would love to buy it if I could and had the garage space. I would keep the 307 in it. I read in a Camaro book a few years ago now that the 307 came about because of Chevrolet having 283 blocks around and 327 cranks (because of the 327 block and 283 crank being used to make the 302) so put them together to make the 307. Don't know if this is true or not.

[x Baldwin Motion]

Its basically a 283 block (larger journals though) with a large journal 327 crankshaft in it and pistons with a reduced compression height. If that combo was made up because of the parts laying around from 302 assembly it wouldn't be the craziest thing I ever heard!! I'll stop short of saying "that makes sense"