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| GMC V6 and V12 Engines Engine repair and rebuilding |
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#1
September 24th, 2013, 02:27 AM
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How can you tell a 305 from a 351?
Hello Everyone!
Simple question for you V6 Pros... I have a 1970 GMC 5500 Dump Truck/ Grain Truck. It originally had a 305 in it, but the previous owner let it freeze, and cracked the block. He told me, that, the engine that is in it now, came from a similar vintage fire truck, (w/ 22,000 miles on it). It runs fantastic, plenty of power, even in a big truck. A friend suggested that it may be a 351 instead. Are there any identifying characteristics? Thanks in advance. -Mike 
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#2
September 24th, 2013, 02:37 PM
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Re: How can you tell a 305 from a 351?
You can look at the serial number right behind the alternator/generator on the head. The head is the thing under the valve cover. the valve cover is where the oil goes in
 Here's a pic. its probably covered in grease and dirt, but its there 
__________________
Step by steps: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Some people are like slinkys. Not worth much but funny as heck when pushed down stairs. __________________ If the women don't find you handsome, they should at least find you handy.
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#3
September 25th, 2013, 04:56 AM
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Re: How can you tell a 305 from a 351?
It's fairly easy to find with Fetch's picture. You'll find a flat machined rectangular area with numbers and letters stamped into it. The first three numbers should tell you what you're looking for.
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#4
September 25th, 2013, 06:05 AM
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Re: How can you tell a 305 from a 351?
Actually, it's BELOW where Fletch's photo points, on top of the block, in front of the head, not on the head.
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Ed Snyder Medford, Oregon 1962 1000 Pickup 401M & Muncie 318 with overdrive 1962 K1000 Suburban 401M & SM420 1967 CM1500 pickup 351E & NP435
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#5
September 25th, 2013, 06:40 AM
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Re: How can you tell a 305 from a 351?
Quote:
Sorry for the crappy advise.  I barely knew what a gas cap was when I started this but as the old saying goes... ..."And now I are one"  It's right around there though. It's probably covered in yuck though so scrub a little and it'll pop right out.
__________________
Step by steps: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Some people are like slinkys. Not worth much but funny as heck when pushed down stairs. __________________ If the women don't find you handsome, they should at least find you handy.
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#6
September 25th, 2013, 06:01 PM
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Re: How can you tell a 305 from a 351?
From Jolly's site
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1961 GMC Suburban 305A Overdrive 1962 GMC Utility 305D
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#7
September 25th, 2013, 07:34 PM
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Re: How can you tell a 305 from a 351?
Good job Funky61, and that'll sure give him what he needs, but if you have time, would you PM me about what kind of magic did you use to get that picture from Jolly's stuff, which is on this site now I think, over to where you could make it appear on this thread? Huh? Could ya?
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#8
September 28th, 2013, 07:56 PM
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Re: How can you tell a 305 from a 351?
Upon looking at the pad, it was clean enough to read, it is a 401.
Thanks for everyone's help. I am not new to old trucks, just new to old V6 trucks! -Mike
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#9
September 28th, 2013, 11:17 PM
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Re: How can you tell a 305 from a 351?
Quote:
__________________
Step by steps: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Some people are like slinkys. Not worth much but funny as heck when pushed down stairs. __________________ If the women don't find you handsome, they should at least find you handy.
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