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Old 04-05-2013, 06:11 PM   #1
hogcruzen
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crate motor crazy

Okay , i have a 86 c10 with a bad 305 . I was looking at gm crate motors ,,,350/260 ,,,,350/290 and 350/300. i am told the only difference is the cam ? Now 86 being the changing year for 2 peice to one peice rear main seal.. now i'm pulling my hair out . The gm parts guy said none of the crate motors would work, just rebuild the 305. Seems to me a flex / trans plate would take care of hat .. somebody please shed some light on this ...
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Old 04-05-2013, 06:18 PM   #2
LONGHAIR
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Re: crate motor crazy

Yeah, your guy is off base here.
The only difference that would matter is the flexplate. The bolt pattern changed. Otherwise everything else will bolt up fine.

I would never rebuild a 305.
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Old 04-05-2013, 07:39 PM   #3
storm9c1
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Re: crate motor crazy

Yep, change the flexplate.

Depending on your state, he may not legally be allowed to tell you to exhange an engine unless it is a 100% stock replacement (ie: same motor). Some states are funny about engine swaps and emissions especially if it's a daily driver and not registered as an antique (or off-road use only). The easy test is to tell him it's an off-road 4-wheeler only. Then he may suddenly say "sure, that engine will work great!" Or he is just clueless and didn't want to deal with you.
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Old 04-05-2013, 09:03 PM   #4
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Re: crate motor crazy

The "OUCH" part of that GM crate, is that they will warranty that 350...IF a 350 came out of that truck? Just a 'heads up", but I do agree with the others (flexplate change, & you are on the run? crazyL
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Old 04-06-2013, 06:55 PM   #5
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Re: crate motor crazy

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Originally Posted by LONGHAIR View Post
Yeah, your guy is off base here.
The only difference that would matter is the flexplate. The bolt pattern changed. Otherwise everything else will bolt up fine.

I would never rebuild a 305.
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I would never rebuild a 305.
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