GMC V-6 Powered Whites

[mechohaulic]

10 hours ago, Geoff Weeks said:

He was refering to White Mustangs, but thinking about it, they had about as much room as the back seat of a Ford mustang

I wasn't 

[Geoff Weeks]

I know!

[67RModel]

16 hours ago, Geoff Weeks said:

GM had a 702 V12 (two 351 V6's on one block)

Don't forget the 837 CID V8 of the same family. I think it and along with the 351 and 478 Magnum version of the V6s were also available as Toroflow diesels.

 

The gas burning semis of the time probably moved the same loads as the diesels did albeit slightly slower. Back then the weights were probably overall less than today and the world moved slower than it does today. I think back then it was probably acceptable and "normal" to have semis pulling steep hills at 10 or 15 mph.

[mowerman]

16 hours ago, mechohaulic said:

NO I am referring to a '66 GT 350 Shelby mustang blue with 2 ==10 in white stripes down the middle front to back.  back seat room was to ???????? 😁

i drive a 2014 mustang,,,,and the back seat is very small...i only sat back there once just to see what it was like....im only 5-7 and i dont think i could travel very far back there,,,and yes its around the size of a rumble seat,,,lol.bob

[mowerman]

46 minutes ago, 67RModel said:

Don't forget the 837 CID V8 of the same family. I think it and along with the 351 and 478 Magnum version of the V6s were also available as Toroflow diesels.

 

The gas burning semis of the time probably moved the same loads as the diesels did albeit slightly slower. Back then the weights were probably overall less than today and the world moved slower than it does today. I think back then it was probably acceptable and "normal" to have semis pulling steep hills at 10 or 15 mph.

lol well i used to run a 237 up the grapevine years ago and with 80,000 id be doing 12 mph....but a buddy hadda 318 detroit,,,and his was even slower than that,,bob

[h67st]

18 hours ago, cruiseliner64 said:

I just cant think of a gas (petrol) powered semi truck.What was the gas mileage like? Im sure it was smooth to drive but would it have the same  power as a diesel of the same size? Iv never seen one over here,in fact Iv never even heard talk of one here.There were small trucks of about 12 tons gross here years ago.Bedford was the only one I can think of selling them but not semis....

Paul

My dad had a White Mustang single axle tractor with a gas engine, he said it got 2 mpg. It was a former Coca-Cola truck.

[RoadwayR]

17 hours ago, mechohaulic said:

the R's with v8 Chryslers were R=400 

Right.  I looked it up, the Mack's with EN-414 gasoline engines (Chrysler 413 industrial) were the 410 series.  There was an R, DM, and MB 410.

[Geoff Weeks]

2 hours ago, 67RModel said:

Don't forget the 837 CID V8 of the same family. I think it and along with the 351 and 478 Magnum version of the V6s were also available as Toroflow diesels.

 

The gas burning semis of the time probably moved the same loads as the diesels did albeit slightly slower. Back then the weights were probably overall less than today and the world moved slower than it does today. I think back then it was probably acceptable and "normal" to have semis pulling steep hills at 10 or 15 mph.

I didn't forget the V8 but don't think it was ever put in trucks, correct me if I am wrong. The V6's were all I came across. 

 My memory isn't what it used to be, may be it was the V-8 toilet bowl wasn't put in trucks (diesel).

Otherwise, why would the 702 V-12 exist, if there was a larger V-8?

By the time GMC's V-6's came out larger gas semi's were on the wain. GMC already had the 503 inline gasser.

Keep in mind, that when gassers were big, we didn't have the Interstate system yet built. There were some sections and some Tpk's but a lot was old US routes that went through towns, and speed was slower. You weren't doing 70 Mph on US 6 or US 30.

Edited Friday at 06:28 PM by Geoff Weeks

[RoadwayR]

GMC made the 702 V-12 from '60 to '65, it was replaced by the 637 V-8 in '66.  I have seen a few 637's, mostly in fire apparatus.  There was also a very rare Toro-Flow diesel 637 V-8 which I have only seen in boats.  

[tjc transport]

we had a 66 crackerbox 85 foot aerial ladder, with 750 gallon water tank,1000GPM pump, and a full compliment of ladders. it was ordered with the V12 gas engine. 

by the time they got around to building it the V-12 was discontinued and they put in an 837 magnum. that thing was the biggest turd i ever drove. by the time they got rid of it in 85, it had only racked up 16,000 miles. if you had to go north of the firehouse, you had to go west 1 mile and then northeast to get to the other side of the big hill 1/8 mile from the firehouse. the truck would not climb the hill, even in first gear low gear in the two speed rear. 

and it only had a 55 mph top speed.

it was donated to a fire company in new mexico or arizona, it took them 3 weeks to drive it out there.

[cruiseliner64]

5 hours ago, h67st said:

My dad had a White Mustang single axle tractor with a gas engine, he said it got 2 mpg. It was a former Coca-Cola truck.

2MPG....what price was a gallon of gas back then? Id say it was smooth to drive.Id love to see one...

Paul

[mechohaulic]

6 hours ago, mowerman said:

i drive a 2014 mustang,,,,and the back seat is very small...i only sat back there once just to see what it was like....im only 5-7 and i dont think i could travel very far back there,,,and yes its around the size of a rumble seat,,,lol.bob

don't forget WE where smaller back then also. '66 back seat smaller just meant two had to sit closer. LOL

[Joey Mack]

Yeah,  i crammed myself and a girlfriend in the back seat of my 69 Camaro several times...  Had no choice but to be up close and personal..🍻

[mechohaulic]

3 minutes ago, Joey Mack said:

Yeah,  i crammed myself and a girlfriend in the back seat of my 69 Camaro several times...  Had no choice but to be up close and personal..🍻

bet you wish you still had the camaro !!!!

[Joey Mack]

Hell Yes !!!

[mowerman]

well they are sports cars,,,,so lucky to have a seat at all back there

[h67st]

On 8/15/2025 at 7:33 PM, cruiseliner64 said:

2MPG....what price was a gallon of gas back then? Id say it was smooth to drive.Id love to see one...

Paul

In 1974 (when he had the truck), gas was $0.39/gallon.

[cruiseliner64]

3 hours ago, h67st said:

In 1974 (when he had the truck), gas was $0.39/gallon.

Those were the days.....You dont happen to have any pictures?.

Paul

[other dog]

On 8/15/2025 at 1:08 PM, mowerman said:

lol well i used to run a 237 up the grapevine years ago and with 80,000 id be doing 12 mph....but a buddy hadda 318 detroit,,,and his was even slower than that,,bob

That reminds me of the late Mike Snead, "jig saw".  He had a green and white Transtar of his own leased to H.H.Moore before he started driving one of H.H's trucks, had a 318 and a 10 speed in it. We were hauling wood chips from Ivy, VA. to Covington for Westvaco and jig Saw's uncle would ride with him sometimes. They'd climb Afton Mountain on 64 just a little bit faster that you could walk, and both of them would be holding the door open with their foot because it was so hot. That truck was weak even for a 318.