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  #31 (permalink)  
Old 05-16-2009, 11:03 PM
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I wouldn't offer more than a hundred apiece, what do you think the chances are that anyone else will ever be looking for one, as old and undesirable as these are. Always start low, you can always raise your offer, it's apples to pidgeons to try to compare these engines to the value of the modern Chrysler engine.

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  #32 (permalink)  
Old 05-17-2009, 08:55 AM
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Here's a link for ya.

http://www.6066gmcguy.org/305V6.htm
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  #33 (permalink)  
Old 05-17-2009, 09:31 AM
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hmm you have a good point eric whatever they payed to get the trucks these came out of they have already gotten back so anything i am goin to offer is already profit... funny how you sometimes hafta have some one else point out the glaringly obvious *doh* i guess i havnt been thinking straight with everything thats gone on this week...
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  #34 (permalink)  
Old 05-27-2009, 10:25 PM
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well im am now a 305 and a 351 richer and $200 poorer i am going to be putting most of my effort into the 351. first i need to see what is holding the bell-housing on... damn thing is stuck fast, then get it mounted on an engine stand and see if i can get her to turn. i also need to find a place in town that can acid dip it to get all the gunk off and then its off to the machine shop... actually need to find a good one and get a quote first... then... going to need sleeves put in and see if i can a) get custom pistons made to bump up compression, b) get the deck height machined down for the same, or c) a combination of both.
but before any of that need to put a rack and pinion in my daily driver and do a tune up... i'm going to be busy tomorrow
btw any one know a good company that does camshaft regrinding? i would love to go to hydraulic lifters... plus breathing better is always a good thing...
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  #35 (permalink)  
Old 05-28-2009, 03:13 AM
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Ask around for a machine shop w/a "hot tank" for getting your parts cleaned up.
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  #36 (permalink)  
Old 05-28-2009, 04:30 PM
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Good luck with your project. Post lots of pictures, you are likely the only one sinking any money into the kind of build your doing...in the world.

We all would love to watch.
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  #37 (permalink)  
Old 06-23-2009, 02:54 PM
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k its been a while since my last post i have gotten the 351 torn down and its at the machine shop the block / heads / valve train have been cleaned the block is surprisingly clean not a lot of rust spots that i can see ... unfortunately i cant see all of the insides im waiting for them to magnaflux it and see if there are any cracks etc. the pistons/ rods outa this thing are huge, and in a rather neat bit of weight saving the risers for the rocker arms are made of cast aluminum pics in a sec

Five0
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  #38 (permalink)  
Old 07-09-2009, 12:15 AM
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ok it seems i cant bore my block to 401ci so now i need to find some 351 pistons... anyone know of an uncle who has a box of nos gmc pistons in his attic or some other combination of estranged family member and unlikely hiding spot? i cant seem to find any one that makes pistons for it i can find 401 pistons and 305 pistons but none in between... i really dont want to start this process over again with the 305 block >_> so please does anyone know of an old machine shop or parts warehouse or what ever that may have a set?
i looked at egge but their 351 stuff seems like windsor, etc ford v8. also kanter has everything but rings and pistons for this whole rebuild here they also have the kit for the 305 if i really have to go that route
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  #39 (permalink)  
Old 07-09-2009, 07:48 AM
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A build like this may require you to think outside of the box.

Starting w/the piston pin height and bore size, go through some catalogs and see what's in the vicinity of where you need to be. Often a piston for an entirely different app will be very close to what's needed.

With the rod journal of your crank turned down to a more common size- Ford or SBC or BBC, etc.- your chances will be multiplied many times over for finding a usable combination of parts.

As an example, a recent car mag build up of a 4" stroke SBC used Ford pistons that were spec'ed for a 347cid stroker engine, IIRC!

OTOH, if you want to keep your GMC all GMC, I would start perusing the Hemmings ads.

Good luck.
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  #40 (permalink)  
Old 07-28-2009, 01:28 PM
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well i have a few throw *more* money at it options first: is custom pistons, second: is bore it to 4.6in and use big block pistons, have custom rods made, and have the crank resized giving me a mild stroke letting me use BB rod bearings and pistons but getting the custom length rods will be a *****...last i can have sleeves put in and still use the 401 gear... now i have not looked at prices i can imagine i would b looking at a price range of a lot to a hell of a lot... the 305 is just more economical right now and i can always come back to this block later when i have more cash
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  #41 (permalink)  
Old 07-28-2009, 04:23 PM
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About what length rod would the 4.6" BB piston/bearing combo need?
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  #42 (permalink)  
Old 07-29-2009, 02:04 PM
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well the stroke is 3.58in the pistons are much taller than normal bbc pistons and i would probably need about .5in turned off the crank to get it to bb dimensions soo maybe 7 or 7.5 in rod lengh, maybe more... just me guestimating if you look at my journal you can see the 351 piston and rod next to a sbc 350 piston there is a lot of length difference, kinda apples to oranges but it gives a sense of scale i guess
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  #43 (permalink)  
Old 07-29-2009, 02:39 PM
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Yeah, that rod is pushing 8" (7.875" by my less-than accurate measurements off of the monitor), plus has a piston w/a big compression height and a very low ring pack- I'm thinking a 10" rod might fit into the crankcase, considering the rod journal needs to be turned down a lot, too.

Do you happen to know what the deck height of the block itself is?
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  #44 (permalink)  
Old 07-30-2009, 11:21 PM
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not a clue on the deck height... but the way that option is lookin im lookin at 2.5-3 grand just in the rotating assembly for probably zero net gain in performance. rebuilding the 305 is going to b the easy and cheep route. still kinda fun to see what throwing ridiculous amounts of cash at it might get me. ill post more as as work continues on my build
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  #45 (permalink)  
Old 07-31-2009, 01:09 AM
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My questions revolve around a (prob.) harebrained idea that there could possibly be diesel rotators or components that may be applicable, as opposed to all custom fabbed and/or BBC racing app parts.

At least that's a possibility that has likely not been explored.
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