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.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Could you call me, five one three, five one eight, three five zero one.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Very cool story. 3.08 gears would favor stock low speed, high torque cam. With that gear, you can win "farthest distance awards"... my truck runs great, but needs OD or lower gears. I do like going up hills in drive with 4.10s.

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.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

No Lie My Brutha! I've always said "if your worried about gas mileage your drivin the wrong truck..." ;)

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

I think I saw that phone number on a bathroom wall at Playpen Gentleman's Club. The name above the number was Trisha.

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?

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Not to hijack but I have a GMC V6 to SM420 bellhousing. They're not SAE patterns, http://67-72chevytrucks.com/vboard/s...mc+bellhousing

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.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Well I got that from 6066. V6 site, they have volumes on the V6. Just checked. Bet it was the larger V6, Larger trucks with 5spd. https://www.smokstak.com/forum/threa...gmc-v6.145198/

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).

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

A big block with 3.73s should be melting tires. What's wrong with yours?

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.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Couldn't tell you. It's never burned off go, or very little.

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. :lol:

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Right, and my block sports HP heads off a 67ish 396 SS.

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:lol: Too many rocks.

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.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Next will be adding trailer brake controller so I can pull car hauler.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Show us some pictures of this beast..;)

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

I'd like to hear it too:smoke::chevy:

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.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Can see no pic attachment, what is this the Zuckerberg software?

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.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Still have NP435G from truck.

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Pics

Re: Putting miles on 67, 402bbc VS 67 V6 305E
 

Adding Kelsey Hayes brake controller for pulling trailer.