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Old 03-08-2007, 06:51 PM   #14
oldgold70c10
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Join Date: Feb 2006
Location: Morrison, Oklahoma
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Re: 305 vs. 307 street build opinions

I am currently running a tired old 305 in my truck right now, and, given the 67-68 flavor I am planning on doing my truck in, have thought about the 307, especially since I know where two untouched 68 307 are that could be had fairly cheap, but the "soft block" comments have had me concerned.

The 305 gets a bad rap because it was usually an economy "smog motor", but the longer stroke should give it more low end torque, plus it uses a 350 crank, and I haven't heard anything about soft block castings.

I know that 350's are almost overused to the point of seeming like a generic V8, so it is tempting to build something else just to be different, even if it is a smaller engine, after all, lots of people build 283's, and they are smaller than the 305 and 307.

I personnaly am thinking of stroking a 350 out to a 383 just to be different, but still want to consider other engines.
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1969 C10 LWB W/ 250 I6 & 3spd
1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver.
1975 Chevelle Malibu Classic Coupe 350/th350 mint green
1970 C20 Suburban 350/700R4 4.10 gearing green & white
1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver
1983 GMC 1500 Sierra 305/SM465 2.73 rear end

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Last edited by oldgold70c10; 03-08-2007 at 06:52 PM.
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