[V8Vairs] 307 sources/info

[Sethracer at aol.com]

In a message dated 9/28/2010 7:35:09 P.M. Pacific Daylight Time,  
martyscarr at gmail.com writes:

How does  one identify a 307 truck block - as opposed to a 307 car  block?

thanks
Marty Scarr
 
Usually, the only 3 7/8" bore block you will find with 4-bolt main  caps. 
Look for it as removed from 68-73 trucks, usually replaced by 350's. The  350 
has the stroke for the torque. The older blocks also had some pretty good  
material, according to most sources, and no particular shortcomings.
 
Of course, you can always add caps, etc. to a 2-bolt main block. - 

 
- Seth
 
And from a website: 
A 307 cu in (5 L) 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—essentially a 283 block with the longer-stroke 327  crankshaft—
replaced the 283 in Chevrolet cars in 1968 and produced 200 hp  (149 kW) SAE 
gross at 4600 rpm and 300 lb·ft (407 N·m) of torque  at 2400 rpm. Later 
versions produced just 115 hp (86 kW) SAE net.  Chevrolet didn't produce a 
high-performance version of the engine, but 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.