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#26 |
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,625
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Here’s a mileage kicker for you!
Bought a 70 chevelle ss454 back in 1978. LS6, m22 and 3.08 gear. Previous owner didn’t like the solid lifter cam so he had a stock bb cam installed. Same basic cam as in your 402. Highway driving at 65 mph it would get 22 mpg. That’s a Canuck gallon. Same as 18 mpg in US gallons. While it sipped fuel it was a real dawg to drive. Ran out of breath at 4500 rpm. Drove it like that over the winter. In the spring swapped the cam to a LS6 spec but it was a hydraulic cam. Took care of that gas sipping dawg. Dropped it back to 15 mpg in Canuck gallons. Awesome power difference. Would light em up all the way thru 3rd even with the 3.08 gear. And now back to your regular programming. |
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#27 |
Junior Member
![]() Join Date: Feb 2022
Location: Ohio
Posts: 76
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Could you call me, five one three, five one eight, three five zero one.
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#28 | |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
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#29 |
Senior Member
![]() Join Date: Aug 2005
Location: Los Angeles
Posts: 1,332
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Biggest problem with the V-6 in pickups was GMC usually geared them too low.
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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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#30 | |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Quote:
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#31 |
Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
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#32 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
My 67 has Patina, but when I open hood with BBC 402, people step back woooo. Is Big Block that big a deal in trucks?
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#33 | |
Registered User
![]() Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,014
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Quote:
__________________
'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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#34 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,248
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
My 402 just recently came back to life after a 7 yr. hibernation, SWB truck. It's a low mileage rebuild, I only installed new pumps, timing and such since. It runs better than it ever has, I couldn't be happier. It's not quite stock, the heads are 1967 GM HP 396, Delco HEI distributor and high RPM cam.
Differential is a low RPM under-achievement at 3.73:1, there's no burning tires in first gear. On shift it can chirp, that's it. But loves the highway, it just wants to fly. That's what I've always liked about it. No matter how steep a hill it gains speed under little acceleration, and without more.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 05-10-2023 at 03:40 PM. |
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#35 | |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Quote:
I mis read that on the GMC site on design of the engine. V12, large HD truck V6. Your trans, bolts to my bell housing, same as NP435G (the real 4spd). Last edited by 1967GMCC20; 05-10-2023 at 07:31 PM. |
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#36 | |
Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Quote:
Last edited by jimijam00; 05-11-2023 at 08:32 PM. |
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#37 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
I have not opened 4 barrel yet, still enjoying cruising.
Kinda wonder how it would run down qtr mile. Hauled 10ft posts for grapevines today from Farm Store. |
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#38 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,248
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Couldn't tell you. It's never burned off go, or very little.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#39 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,432
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Weird. If I cob mine, even with the shell on it and a 3.56 axle, it'll lay rubber and chirp second. No wheelies like the farm truck, though.
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__________________
~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#40 | |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,248
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Quote:
Don't mind me, I don't know what I'm talking about. First off my kick down never worked. Second I had 8" wheels and 70s, so on and so forth, and I probably baby it too much. Everything works now, lots rebuilt, timing chain, trans., axle, carb. etc. I just changed the oil today and figured it's time to really test her out. It runs like a bat out of hell, I'm really surprised. Burns rubber all kinds of ways, but I still refuse to jump from a dead start ![]()
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#41 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
BBC Keeps running good. Hooking up neutral safety on Lokar shifter today. Thought about that when was going to let someone take it for a spin.
It's amazing how smooth this engine 402bbc runs. Torque is definitely big block. |
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#42 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Next will be adding trailer brake controller so I can pull car hauler.
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#43 |
Registered User
Join Date: Jan 2011
Location: Delaware and Long Island, New York
Posts: 3,455
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Show us some pictures of this beast..
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#44 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,248
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
I'd like to hear it too
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__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#45 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Have not figured out wonky photo upload process. If it takes more than 3 steps...forget about it.
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#46 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Can see no pic attachment, what is this the Zuckerberg software?
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#47 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Just ordered a vintage NOS Kelsey Hayes brake controller fir 67 GMC. Now I can have trailer brakes on the oldie.
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#48 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Still have NP435G from truck.
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#49 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Pics
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#50 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 218
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Adding Kelsey Hayes brake controller for pulling trailer.
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Tags |
1967, 305e, 402, gmc |
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