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GMC V6 and V12 Engines Engine repair and rebuilding

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  #11  
Old April 8th, 2022, 08:52 PM
Prowbar Prowbar is offline
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Default Re: It's at the Machine Shop

Quote:
Originally Posted by Walys60 View Post
Thanks for the tips...will definitely be keeping an eye out for options like that.

Sorry, I wasn't clear on the cost. Yeah, shoot, that may be the exact place he was looking at pistons! He mentioned $800 for custom made from someone. He was just saying that is the most expensive of a list of expensive, hard to find, parts for it and the total would end up (after all parts and machine work) around the $4500 range. No assembly but 'ready to assemble' price basically.
Man that sucks to hear. If you can find a replacement 305A, possibly from one of the forum members here, that'd be the way to go.
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  #12  
Old April 9th, 2022, 01:34 AM
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AZKen AZKen is offline
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Default Re: It's at the Machine Shop

It makes no sense to rebuild a GMC 305 V6. Fixing semi small issues is OK. These motors have virtually no parts left, no one knows anything about them and they are, for the present, available for a low price from non believers. Find a donor, hear it run and/or do a compression test. Check the oil. Keep your old one for the bolt on parts.

An easier option
If you like the truck and not worried about if it has a GMC 305A V6, Drop in a SBC. A SBC is a GM product. Lighter, faster, HEI, parts galore. That wouldn't hurt anything. Gives you the chance for any trans, manual or automatic with OD. Everything fits everything. Don't obsess over a GMC 305 V6. The truck itself is very nice to own.
Change course, be happy.

P.S. I didn't search your posts, so I don't know why you are rebuilding it?????????????

Last edited by AZKen; April 9th, 2022 at 01:44 AM.
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  #13  
Old April 9th, 2022, 02:21 AM
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Default Re: It's at the Machine Shop

Quote:
Originally Posted by AZKen View Post

An easier option
If you like the truck and not worried about if it has a GMC 305A V6, Drop in a SBC. A SBC is a GM product. Lighter, faster, HEI, parts galore. That wouldn't hurt anything. Gives you the chance for any trans, manual or automatic with OD. Everything fits everything. Don't obsess over a GMC 305 V6.
'

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  #14  
Old April 9th, 2022, 05:49 AM
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Default Re: It's at the Machine Shop

It's the second option man Trying to help the gentleman. Ease his mind and his wallet. A brainstorming session. Inflexibility killed the cat. I didn't say throw out the truck with the motor.
Waly mentioned it first.
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  #15  
Old April 12th, 2022, 02:35 PM
GMCv6inND GMCv6inND is offline
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Default Re: It's at the Machine Shop

If you end up replacing your 305, keep your eyes and ears open for a truck engine too (351 v6), it could be easier to find.
Itís a direct fit, although youíll have to swap your light truck parts (front of engine and bell housing). Then you have a running and larger engine. Iím currently running a 5000 series 351 in my half ton and have another 4000 spare.
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  #16  
Old April 12th, 2022, 07:07 PM
Prowbar Prowbar is offline
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Default Re: It's at the Machine Shop

Quote:
Originally Posted by GMCv6inND View Post
If you end up replacing your 305, keep your eyes and ears open for a truck engine too (351 v6), it could be easier to find.
Itís a direct fit, although youíll have to swap your light truck parts (front of engine and bell housing). Then you have a running and larger engine. Iím currently running a 5000 series 351 in my half ton and have another 4000 spare.
Bet the 351 has some added 'git up and go' compared to the 305?
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  #17  
Old April 15th, 2022, 11:07 PM
tbucketnut tbucketnut is offline
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Default Re: It's at the Machine Shop

Hang in there, it seems we are all having some issues. My block stock bore block cannot be used, found a crack, so my replacement block has already gone .030 over and it had a broken piston in it. I have some really nice .040 pistons/triple rings, waiting to hear if I can make it work, might need a sleeve myself. If it needs more than one sleeve, I might punt the football and sell all my bearings/pistons rings and gaskets. Sleeving the cylinder is pretty expensive these days.
Steve
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1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
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  #18  
Old April 17th, 2022, 06:49 AM
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Default Re: It's at the Machine Shop

I rest my case.....................Fetch.
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  #19  
Old January 26th, 2023, 08:10 PM
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Walys60 Walys60 is offline
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Default Re: It's at the Machine Shop

Okay, so back to looking at the engine again.

My brother is the engine guy, of the two of us, and he thinks we'd be better off just putting it back together. Having the heads done at the machine shop, get new sleeves/bearing etc. and maybe have the crank turned...but then just put it back together. Which means I would still need to find rings.

The only problem it ever had was the oil pump started squealing right before I tore it down, it was seeping at various gaskets/seals, and there had always been a valve issue with it if the timing wasn't set out of specs (don't ask, I have no idea but clearly something in the heads). It never smoked at all, really it ran great. Kinda back to ticked that I got talked into tearing it apart in the first place now.

Anyway, that's what I think we're going to do. I talked to the machine shop and they're going to do the heads for $150 and would polish the crank for $20, but I was just looking at it and I think it's going to need turned, as it is a bit scored in places.

Last edited by Walys60; January 27th, 2023 at 01:29 PM.
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  #20  
Old January 27th, 2023, 02:41 PM
tbucketnut tbucketnut is offline
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Default Re: It's at the Machine Shop

Great to here, I just finished my 305 and have somethings left from my rebuild.
Machined crank and set of .020/.020 main and rod bearings. Found out my engine was a 1974 305 and took a different main bearing (bigger), so the main bearings are for 60-73 motors.

Good luck with the rebuild. Dont forget to replace the oil pump, I found out there are two different ones to based on the size of the oil mounting bolt. They are NOT interchangeable.
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Gig Harbor, Wa

1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration

1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
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