1967 GMC V6 305 cu in...

['68OrangeSunshine]

Originally Posted by Bob B.

The Ford 240 and 300 heads have alternating valve positions with individual ports, compared with the Chevy 6's siamesed intake ports. The center exhaust ports of the Chevy are also paired. The Chevy straight 6's use a number of 'Small Block' V-8 parts including pistons, valves, and rocker arms. The Ford 240 and 300 borrow some parts from the Windsor and FE V-8's. Cylinder head notwithstanding, I always thought the 292 was a better engine than the 300 because of its tall deck block and much better connecting rod ratio. The oiling system is better as well (Ford feeds the cam bearings before the mains). The 300 is something of a mythical engine among Ford fans (it is one of the better Ford engines no question) but I think the 292 was tougher and pulled harder at low r.p.m.'s.

The GMC V-6 was something else entirely, a purpose built heavy duty commercial engine that compares to the International Harvester V-8's and Ford Super Duty V-8's.

Thanks for the details about the Ford inline heads. I had assumed they just copied the Chevy L25.
My 2005 build of a 292 block uses Intake Valves that would be standard on the Chevy 307 V8 -- 1.84'' instead of the stock L6 1.6''.

[Rods]

Originally Posted by factorystock

GMC V6 1/2 tons came with a 3.07 rear standard, would think it would do ok in the gas mileage dept. '67 Chevy came with a 3.73 standard.

You’re kind of correct but not completely. Gear ratio was determined by engine size transmission type and if it was a 10/20/30.

Also 7 miles to the gallon at $5.00 per gal. now days is not OK gas mileage to me but back in 67 I guess it would have been ok……..

['68OrangeSunshine]

Originally Posted by Rods

You’re kind of correct but not completely. Gear ratio was determined by engine size transmission type and if it was a 10/20/30.

Also 7 miles to the gallon at $5.00 per gal. now days is not OK gas mileage to me but back in 67 I guess it would have been ok……..

In 1967 in LA, Regular Leaded was about 17 cents per gallon and Premium could get as high as 25 cents per gallon at a station just off the freeway. You could fill a behind-the-seat 20 gallon tank for under a Fiver -- and possibly get change back. Plus a Zodiac-themed coffee mug or other promotional item, and free road maps.

[Rods]

Originally Posted by '68OrangeSunshine

In 1967 in LA, Regular Leaded was about 17 cents per gallon and Premium could get as high as 25 cents per gallon at a station just off the freeway.

Man…….what a great time let’s bring those prices back

['68OrangeSunshine]

Originally Posted by Rods

Man…….what a great time let’s bring those prices back

If we had Gold Quarter Eagles as $5 coins -- instead of paper -- we could.

[factorystock]

Originally Posted by Rods

Also 7 miles to the gallon at $5.00 per gal. now days is not OK gas mileage to me but back in 67 I guess it would have been ok……..

Something is seriously wrong with that V6 if its only getting 7 MPG. Don't have a '67 test handy, but with the better aerodynamics of a '67, it should do just as good or better than a '60 and a '65 4x4 with the 305 V6.