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#1 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Putting miles on 67, 402bbc VS 67 V6 305E
Amazed how much better this GMC drives after pulling 305E and upgrading to 402 BBC. conversion.
Drives like a car, smooth, V6 was unique, but seriously under powered. 305E V6 7.5mpg. 170hp 402 bbc 12mpg. 310hp |
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#2 |
Registered User
Join Date: Apr 2009
Location: PNW
Posts: 553
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
What year is the 402? GM didn't punch out the 396 until 1970.
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#3 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
I got the 402 from a 1970 SWB CST takeout.
All date codes are correct for vehicle it came from. All I changed was intake to a Holley cast iron 1966 hi rise. |
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#4 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Thinking next upgrade, is a gear vendor over drive. Then I can run freeway speeds..
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#5 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,858
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Gladyou like it. Theb6 can rip a building out of its foundation, but definitely lacks hiway guts. The OD will definitely help calm the BBCon the hiwY also
__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#6 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Yep, V6. Had good low end lugging torque, but also lacked RPM. It went to a good home, guy restoring K20 4x4 GMC V6 truck.
This 402.. goes up steep hills in Drive that put my V6 in 1st. I only need OD and then this is a true parts chaser. I have the NP435G trans, and trans cross member and mounts, and engine mounts for V6 if someone needs them. |
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#7 | |
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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#8 |
Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,694
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Got a 454 in my '71.. It's a disease I tell you. The first symptom is you go around with a smile on your face. Also makes you forget about gas mileage..
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#9 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,369
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
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#10 | |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,484
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Quote:
My 82 C10 had a mild 355/TH350 with a 2.73 and 29.5" tall tires. Cruising at 70mph was ez-peezy, but it would spin the tires in first gear. Just trying to save you from OD expense and hassles, although the GV should be less of a PITA than a 700R4. And it will never break!
__________________
Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#11 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Ran another 100mi + today, with 10gal of premium thru the big block.
Truck has 4.10 gear Dana 60. |
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#12 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,858
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
So 8 to 10 MPG whether your driving easy, towing or whatever then.
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__________________
Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#13 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Front sway bar is going to be next.... lot of nice winding roads to be seen.
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#14 | |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Quote:
V6 7.5mpg uphill, down hill, hauling water.. it just liked fuel. But since designed in late 50s, looks like ports from a 348...anchor, neither designed for fuel economy, but fuel was cheap. Massively heavy built, designed for durability. My old V6 is going in a 67 4x4 restoration, his block was cracked. Win-Win |
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#15 |
Junior Member
![]() Join Date: Feb 2022
Location: Ohio
Posts: 75
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
If your friend would happen to know of a extra set of V6 4X4 engine perches I'm in bad need of a set for my restoration. My truck had been converted to a sbc at one time but it did have the original V6 with it. Thanks for any help.
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#16 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Are the front mounts the same? Bell housing on mine was 4spd,
If yours is a stick, it might be the same. |
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#17 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
You pay shipping, you can have them.
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#18 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Where in ohio? Pick them up, you can have three mounts, brackets, x member.
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#19 |
Junior Member
![]() Join Date: Feb 2022
Location: Ohio
Posts: 75
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
I'm in Batavia, mine is a 4sp. Could you send me pictures, if they're right I'll be on the way. Thanks
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#20 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Bet it's same, not too many ways to mount that V6. Heading down to barn.
Last edited by 1967GMCC20; 05-08-2023 at 06:10 PM. Reason: Typo |
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#21 |
Junior Member
![]() Join Date: Feb 2022
Location: Ohio
Posts: 75
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
I may not be able to get back to you until tomorrow.
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#22 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
No problem, bet there is only one set of mounts for V6, big engine tight fit. I have eng mounts and frame mounts. And crossmember for bell housing to frame with mounts.
My 67 is here to look at frame hole locations. |
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#23 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
Had a 78 suburban with 454, ran good, ended putting eng and trans TH400 in a 78 Silverado that was originally a diesel. It had 2.73 gears. Was perfect for Texas freeways and FM roads.
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#24 |
Junior Member
![]() Join Date: Feb 2022
Location: Ohio
Posts: 75
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
The frame mounting brackets (perches) and front crossmember are different on 4X4 vs 2WD. I have the brackets on the engine and a crossmember I've found (same as chevy 292 4X4) but I'm short the frame brackets. The rear mount crossmember I have as it was the same for chevy V8 or GMC V6 4X4's.
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#25 |
Registered User
Join Date: Apr 2022
Location: Medina, Ohio
Posts: 211
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Re: Putting miles on 67, 402bbc VS 67 V6 305E
So the rear X member on bell housing is same. Mine is all there. The engine Bell housings were (Not HD SAE), so I suspect similar.
I chisled the rivits, not torched. I have the dust shield from Bell housing. Got left behind when I sold engine. Last edited by 1967GMCC20; 05-11-2023 at 06:05 PM. |
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Tags |
1967, 305e, 402, gmc |
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