Gen 5 & 6 blocks

by 73ss Thu Jan 23, 2020 6:30 pm

I had read in hot rod where Ford had requested GM to quit using the term "mark" when referring to the big block line up. I guess Ford didn't want anyone to be confused between a Lincoln and a BBC? That's why the newer versions are referred to as "gen" 5 & 6.

Behind the timing cover on my gen 6 block, "MARK VI" is cast into the block. Maybe GM's way of giving the finger to Ford? Twisted Evil

I wonder how many lawyers got involved in this dispute?

I also noticed under the cam tunnel it is cast 7.4/8.2 8.2L is the 502, which uses huge siamesed bores. How can it be the same casting?

by Iggy Thu Jan 23, 2020 7:40 pm

Lincoln already had the Trademark on "Mark V" and "Mark VI", that is why Chevy had to go to Gen V & VI.

Too bad GM did not Trademark Super Duty and HO - Pontiac used them long before Ford!

Chrysler holds the Patent on the Jeep grille, that was actually developed by Ford!

by thatfnthing Fri Jan 24, 2020 10:38 am

Iggy wrote:Chrysler holds the Patent on the Jeep grille, that was actually developed by Ford!

I had heard when the Hummer first became a production vehicle for the masses, there was a dispute with GM & Chrysler over this -- apparently Chrysler felt the very similar number of grille bars would create 'brand confusion'. I always felt that if you confused the two, you weren't qualified for either. Smile

by Limey SE Fri Jan 24, 2020 10:51 am

I have Parts on my Mark IV from Gen 5 454 LOL ............. Block/insides are 1987, heads are 1974 781's, Valve covers are from a 1994 454 LOL I love it

by Keith Seymore Fri Jan 24, 2020 12:38 pm

Iggy wrote:Lincoln already had the Trademark on "Mark V" and "Mark VI", that is why Chevy had to go to Gen V & VI.

This is correct.

thatfnthing wrote:
Iggy wrote:Chrysler holds the Patent on the Jeep grille, that was actually developed by Ford!

I had heard when the Hummer first became a production vehicle for the masses, there was a dispute with GM & Chrysler over this -- apparently Chrysler felt the very similar number of grille bars would create 'brand confusion'. I always felt that if you confused the two, you weren't qualified for either.

I wrote the original engineering program plan for what became the Hummer H2.

I can tell you that the number of grille bars was no coincidence.

K