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#1 |
Senior Member
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Location: Conyers,Ga.
Posts: 7,287
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V-6 ?
How can you tell the difference from 305 and 351?
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#2 |
Just like to part out trucks!!
Join Date: Nov 2001
Location: Meriden, Ks-North of Topeka 10 miles
Posts: 27,396
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Re: V-6 ?
I was told once, I think, there is numbers on front of block, one has 305 stamped the other has 351, I got a block over at work, I'll try to look at it tomorrow.
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67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure" |
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#3 |
Senior Member
![]() Join Date: Aug 2003
Location: Conyers,Ga.
Posts: 7,287
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Re: V-6 ?
Thanks.
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#4 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
If its a 351 Magnum or any magnum, it will have a trapezoid base where the carb bolts to the intake. 305E and 351E will have a rectangular pattern, In front of the right head, the casting number is right there. First 3 numbers are the engine displacement.
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#5 |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: V-6 ?
Who cares
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#6 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: V-6 ?
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#7 |
Senior Member
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Location: Los Angeles
Posts: 1,332
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Re: V-6 ?
The numbers are stamped on the block deck surface just ahead of the right cylinder head. 351's were only used in pickups from 1966-68.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. |
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#8 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
What are the average MPG and cruising speeds for the 305E? My truck ain't registered so we cant really tell what cruising speed is. The carb is all rusty and gummed up and dirty, so you can just about see the gas come outta the tailpipes. Runs like a top though.
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#9 |
Senior Member
![]() Join Date: Aug 2005
Location: Los Angeles
Posts: 1,332
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Re: V-6 ?
They like fuel. A lot of fuel. But, they run good on the cheap stuff, so that helps a bit. My 351 would only get about 10 m.p.g., before I took it apart. These engines were designed to work hard at low r.p.m.'s, and 4000 is about the limit. How fast you truck will go depends on the rear axle gearing.
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1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90. |
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#10 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
I think it has 4.10's.
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#11 |
Where's my beer?
Join Date: Aug 2002
Location: I live in the state of denial....
Posts: 5,621
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Re: V-6 ?
I think my Longhorn also has 4.10 in the back and that motor is pretty wound up when going 60 mph, I'm afraid to go faster than that, so I think 60 is max and that may be pushing it, as said before these were working trucks, not highway cruisers, maybe a 5 speed tranny could help in the open highway a bit.
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Paul How do you make the invisible, visible?.........You take it away. Last edited by chevy_fatman; 01-23-2006 at 08:23 PM. |
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#12 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
3.55 rears, or heck, even 3.73s wouldnt hurt the truck a bit. But to change the rear gears, that wouldn't be original, so I couldn't possibly do that. (dad's rule) The 305 seems to accelerate better lugging anyways. What size tires are you running? Mine are 32 inches in diameter. I've read in some places that 60-66 one-tons with 351E's would do 90 no problem. I may raise the B.S. flag for that though.
Last edited by JAKES 68GMC; 01-23-2006 at 08:30 PM. |
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#13 |
Senior Member
![]() Join Date: Aug 2003
Location: Conyers,Ga.
Posts: 7,287
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Re: V-6 ?
Thanks for all the response. I just bought a 68 GMC 1 ton with a v-6 ( My 1st one obviously) and was curious what size it is. I drove the truck a little, but seems to be geared pretty low. I think 60 would definitely max this one out. Mine has 17.5 inch wheels. Thanks again Tim.
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#14 |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: V-6 ?
Jake, they like a lug better being wound up
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#15 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
I figured that out. What really boggles me is that it accelerate faster lugging in 3rd gear than giving it to her in 2nd
![]() I plan on a Holley 500 2bbl, 3 inch dual exhaust, and maybe a Pertronix Ignitor to replace the points. That would wake it up some. Last edited by JAKES 68GMC; 01-23-2006 at 10:06 PM. |
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#16 |
Where's my beer?
Join Date: Aug 2002
Location: I live in the state of denial....
Posts: 5,621
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Re: V-6 ?
My truck still has the original wheels, I'm thinking 31 or 32in diameter.
When you get that Holly on there let me know how it works out for you, I couldn't make it work on mine, I heard somewhere that I had to change the 305 intake to the 351 one to make it work, never did, but I do know where '71 GMC 1 ton with a 351 is at, so is all about whenever I get ready, darn! I just remembered that I need a shroud and I didn't even looked at that truck for it this past weekend doh! ![]()
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Paul How do you make the invisible, visible?.........You take it away. |
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#17 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: V-6 ?
If you want that V6 to last, keep the highway revs down. If you ever see how big the counterweights on the crank are, you will understand why.
__________________
Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#18 |
Senior Member
![]() Join Date: Aug 2003
Location: Conyers,Ga.
Posts: 7,287
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Re: V-6 ?
I found it today. It's a 305. Thanks again.
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#19 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: V-6 ?
The V6s don`t really need to be woken up.They`re just strokers, built for bottom end power and lowerrpm operation.O/d will get it cruising.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#20 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
Well, I need something to brag up about the engine performance-wise. I need a carb regardless. Im going to try an make a homebuilt 4bbl intake this spring, just for fun
![]() ![]() I did the calculations online, and 54.98736567423748234698253478956mph or something is my cruising speed at 2300rpm in 4th with 33" tires. So Sammy Hagar, I CAN DRIVE 55!!!!!!!! HAHA!!! ![]() |
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#21 |
Where's my beer?
Join Date: Aug 2002
Location: I live in the state of denial....
Posts: 5,621
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Re: V-6 ?
BTW, try getting parts for your motor at your local auto parts, they'll swear those motors don't exist
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#22 | |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: V-6 ?
Quote:
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#23 | |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: V-6 ?
Quote:
__________________
'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#24 |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
I got a fuel pump for mine pretty easily. 26 bucks from Napa. They seem to have oodles of torque from what I can tell. My grandfather had a 305A in a 1960 GMC pulp truck. I think it was bigger than a two ton, not sure though. ANYWAY, he ran a 305A 110,000 miles before it burnt a valve. Said it was a great old engine, an it worked good in the truck. My dad said from what he can remember (he was just little), that thing had a lot more than one HOT supper. My grandfather is pretty rough with trucks, too.
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#25 | |
Aluminum slot wheels rule...
Join Date: Jan 2006
Location: Maine
Posts: 6,212
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Re: V-6 ?
Quote:
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