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Old 06-16-2008, 09:08 PM
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Information Needed on 1971 L48 350 sbc internal spec's

I figured so far from the code (cgl) it is a 4 bolt main. I need to find out the rest, ie. cam specs and piston and rod type and crank (forged or cast). It is for a chevelle or nova or camaro or monte. And is rated at 270hp. Would like some help please.

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Old 06-17-2008, 03:28 AM
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Not much to know. This is a low perf motor. It is the base 350.
It may have a 4 bolt main block, but the heads are 76cc low compression smoggers with poor(er) ports, combustion chamber and 194"x 150" valves. Probabily early 882, or 441 or 336, 920 castings. cast dished pistons "929 cam" 194-202@.050" .390-.410" lift 112LSA. Low rise Qjet manifold and carb. 8.5:1 cr. First of the "low lead" engines. May or may not have factory hardened exhaust seats.
Most likely a cast crank.
This is essentually the 350-300hp 10:1 69-70 engine sans the good late camel back 186, 041,040,492 heads and pistons. (cr is lower to run on Low lead fuel) The start of the "smogger era".
The 270hp rating is not the same a how engines are rated today.
The heads are still the pre 1974 heavy casting design.
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Old 06-19-2008, 09:59 PM
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It's essentially the same thing as the current Goodwrench standard crate engine.
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