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#1 |
Registered User
![]() Join Date: Aug 2011
Location: Kingman, AZ
Posts: 1,574
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How do you tell if it's a 305 or a 350?
I am building a 64 C10 Stepside and I ran across an 82 fleetside silverado today for $1000. I might buy it for the parts.
I want a 350 motor and the guy does not know which motor is in this truck. How do I tell what it is? |
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#2 |
Registered User
Join Date: May 2010
Location: Lewis County, WA
Posts: 1,523
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Re: How do you tell if it's a 305 or a 350?
Run the numbers on the back of the block.
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#3 |
Registered User
![]() Join Date: Aug 2011
Location: Kingman, AZ
Posts: 1,574
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Re: How do you tell if it's a 305 or a 350?
I was hoping I could know from looking while I was standing at the truck?
Any certain number set identify the motor as a 350? It is a long drive out there and back..... |
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#4 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: How do you tell if it's a 305 or a 350?
some may have it by the engine mount 3 0 5................3 5 0
one thing i did notice my truck stock came with a 305, 2 line fuel pump stock if it came with a 350 is a 3 line pump..... not sure if that always applies or try looking here......this is one
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#5 |
Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: How do you tell if it's a 305 or a 350?
Decoding the engine is the only true way to know for sure. Visually there is nothing that will give it away.
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Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." |
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#6 |
Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: How do you tell if it's a 305 or a 350?
010 block means it is a 4.00 bore block so that would rule out a 305, but not all 350's have 010 blocks. The number of fuel line has to do with emissions and will not ID a 350/305. Run the codes on the pad in front the right cylinder head that is behind and kind of under the alternator. Checking the codes is the only sure way, short of pulling the heads off the engine.
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Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." |
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#7 |
Registered User
Join Date: Jan 2011
Location: Tulsa,Okla
Posts: 590
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Re: How do you tell if it's a 305 or a 350?
I have noticed some 305's have 2 sets of bolts for the starter. I don't know if this is true on the early ones or not.
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#8 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: How do you tell if it's a 305 or a 350?
the reason i said about the lines was i just bought one
and i was told by Carter the two line pump was not used on a 350 but he said the third line it was to "return fuel to the tank" when i asked if the two line will work on a 350 he said it should but of course this means to it can be reversed i guess..... meaning you could put a 3 line pump for a 350 on a 305 too then
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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#9 |
Registered User
![]() Join Date: Aug 2011
Location: Kingman, AZ
Posts: 1,574
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Re: How do you tell if it's a 305 or a 350?
I found the easiest way in the world to determine what motor was in this truck......
I read the tag on the ait breather. 5.0 305 |
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#10 |
Registered User
Join Date: Dec 2009
Location: Epping, NH
Posts: 605
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Re: How do you tell if it's a 305 or a 350?
what about the vibration damper? Ive always told them apart that way. One is fat (I think its 305) and the other is thin. Obviously that could have been switched too, but generally if you're looking at an old dirty motor with an old dirty balancer it's a fairly safe bet.
Could be Im wrong and have some bad info, but the handful of motors I've checked have turned out to be right when checked that way.
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1982 Chevy K30 CCLB fleetside. Formerly a cab and chassis, now a fleetside dually with the rear wheels tucked underneath. 454/th400/np205/C14/D60, 6/4 inch LIFT, not drop. |
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#11 |
Account Suspended
Join Date: Mar 2011
Location: hastings mn
Posts: 186
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Re: How do you tell if it's a 305 or a 350?
Usually it's cast on the back of the block.
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#12 |
Registered User
Join Date: Feb 2011
Location: Gainesville, FL
Posts: 406
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Re: How do you tell if it's a 305 or a 350?
Mine has 5.0L cast on the block next to the casting number.
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Randy Summers Never brake in the learning curve! 1984 GMC Sierra project truck http://67-72chevytrucks.com/vboard/s...d.php?t=446737 |
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#13 |
Registered User
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
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Re: How do you tell if it's a 305 or a 350?
an 010 block is a 350
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70 stepside 76 blazer 86 Silverado 20 Max Trailering 6.2 Crew 71 Nova SS My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634 |
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#14 |
Registered User
Join Date: Jun 2010
Location: houston, tx
Posts: 323
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Re: How do you tell if it's a 305 or a 350?
I think that the exhaust manifolds were different too. I had one that was cracked, and bought a replacement "blind" ...it turned out it was a 350 and different than the ones my truck had.
(81 c10) |
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#15 |
Registered User
Join Date: Jul 2011
Location: SW Ontario
Posts: 1,204
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Re: How do you tell if it's a 305 or a 350?
Reading the casting number on the block will be the only sure way to know what you are getting. Print out the block casting number list to take with you as a guide over at nastyz28.
Consider the potential amount of engine swaps that could have been done over time, casting number is your only sure fire way to i.d. My truck started out with a 305/700r4. That turned into a 350/700r4 w/the 5.0L manifolds and sheet metal. That turned into a 350/350 combo, and somewhere along the line I put my '73 passenger car exhaust manifolds on it. Looking at anything but the casting number isn't going to let you know what the engine is. Unless you are familiar with how it is supposed to be, you may note something isn't quite right, but won't be able to put your finger on it without something to reference. Alex. |
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