GM Goodwrench 350
02-01-2011, 10:09 AM
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GM Goodwrench 350
Hi All,
I passed on the frozen 350, and found a GM Goodwrench 350 out of a 1978 chevy truck.It has the 010 engine block.What more can anyone tell me about this engine.I pulled the valve covers off and ran the head casting numbers ,and found that they are the crappy
smog era prone to cracks heads. Cant seem to find any information about the engine.Hp specs?
Dennis
I passed on the frozen 350, and found a GM Goodwrench 350 out of a 1978 chevy truck.It has the 010 engine block.What more can anyone tell me about this engine.I pulled the valve covers off and ran the head casting numbers ,and found that they are the crappy
smog era prone to cracks heads. Cant seem to find any information about the engine.Hp specs?
Dennis
Last edited by smoothjazz; 02-01-2011 at 10:14 AM.
02-01-2011, 12:20 PM
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Re: GM Goodwrench 350
Doesn't sound like a "Goodwrench" (replacement) motor; just the original one from the truck.
If it was a 2-bbl it was about 160 HP, if 4-bbl it was about 180 HP. But since you already know you wouldn't be using the heads if you bought it, those don't really matter. It'll have the DEEEP dog-dish pistons; about 8.2:1 compression with the 624 or 882 heads, whichever they are. You wouldn't be re-using those either. Or the 929 cam in it.
In essence, it's yerbasic 70s 350 bolck, crank, & rods core. Nothing else is of any value at all. Not sure what "other info" or "specs" would be helpful.
If it was a 2-bbl it was about 160 HP, if 4-bbl it was about 180 HP. But since you already know you wouldn't be using the heads if you bought it, those don't really matter. It'll have the DEEEP dog-dish pistons; about 8.2:1 compression with the 624 or 882 heads, whichever they are. You wouldn't be re-using those either. Or the 929 cam in it.
In essence, it's yerbasic 70s 350 bolck, crank, & rods core. Nothing else is of any value at all. Not sure what "other info" or "specs" would be helpful.
02-01-2011, 09:35 PM
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Re: GM Goodwrench 350
If it's an original 78 vintage engine it will use 882 heads (1.94/1.50 valves, 76cc chambers), dished pistons (~13cc dish) and the old -929 cam (191/202* @ .050 on a 112* LSA with .390/.410" lift). Compression is officially rated at 8.5:1 but the reality is a little lower than that. If it's a replacement "Targetmaster" 350 engine, it will still be pretty much identical in specs except that it will have -993 casting heads which are "heavyweight" castings and much less prone to cracking in the usual areas.
-993 heads are better than factory-original smog-era -882 heads only becuase they are thicker castings, not because they flow any better.
GM rated the universal replacement 350 "Targetmaster" engines differently over the years. Originally at 205HP, then 225HP and now 250 (or 260HP in some places). They're all the same engine, it's just what intake, exhaust and accessories they were rated with at the time(stock intake and exhaust vs. aftermarket intake, headers, etc.).
-993 heads are better than factory-original smog-era -882 heads only becuase they are thicker castings, not because they flow any better.
GM rated the universal replacement 350 "Targetmaster" engines differently over the years. Originally at 205HP, then 225HP and now 250 (or 260HP in some places). They're all the same engine, it's just what intake, exhaust and accessories they were rated with at the time(stock intake and exhaust vs. aftermarket intake, headers, etc.).
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