Coolest racing engine of all time???

[Master Oil Racing Team]

Don't know who the pit men are, but Bill Van is right. Wayne Walgrave (from I believe La Verne, Minnesota) is at the helm of his own hydro design....Chapparal. What a beautiful noise that motor made. (Except to to pit men who saw my mouth moving might say "Huh? What?"

[Mark75H]

Nice photos, Bill! I think sandcast means KG-9, right?

KF-9, KG-9, Mark40 and Mark50 were all sandcast ... The KF and KG used gear drive distributors ... the 40 and 50 used the belt.

[194265]

Hey Sam, You remember, the early Mark 55's were sand cast also.

[John Schubert T*A*R*T]

Hey Sam, You remember, the early Mark 55's were sand cast also.

I'm not sure that I believe that as the C.C's were die cast with the larger carb opening & the blocks had the pads. Not sure if the earlier models as Sam mentioned had pads.

[Gene East]

Don't know who the pit men are, but Bill Van is right. Wayne Walgrave (from I believe La Verne, Minnesota) is at the helm of his own hydro design....Chapparal. What a beautiful noise that motor made. (Except to to pit men who saw my mouth moving might say "Huh? What?"

Bill and Wayne are correct on all points!
I used to have a CD of Walgrave and Summer's 6-cyl Loopers running together.
It was like a symphony!
Unfortunately, when I tried to play it about a month ago the sound track had mysteriously disappeared.

BUMMER!

BTW: I rode with Wayne in FRR at DePue back in the 70s. Wayne said his regular deck rider was sick and asked if I'd like to fill in for him.
"Naw Wayne, thanks anyway but ask someone else", NOT!
You bet your sweet bippie and anything else you want to throw in! I was in that boat like a duck on a june bug!
If you think a 6-Looper sounds good from the bank, you should hear & feel it just inches away from your butt!
That was a boat ride to remember, and even 40+ years later I still remember!
Thanks Wayne!

[194265]

If you would go back and read my article call the "Sandcast Thunderbolts" you will see that a small groupe of Mark 55's where indeed Sandcast.

[John Schubert T*A*R*T]

If you would go back and read my article call the "Sandcast Thunderbolts" you will see that a small groupe of Mark 55's where indeed Sandcast.

Again,

you may be correct, but MK55's had C.C.'s with small carb openings whreas the 55H C.C's had the larger carb openings.

[John Schubert T*A*R*T]

If you would go back and read my article call the "Sandcast Thunderbolts" you will see that a small groupe of Mark 55's where indeed Sandcast.

I read your Sand Cast Thunderbolt article again & my comment regarding the MK55H still holds true that MK55H's were die cast & none were sand cast. First as I said earlier they all had padded cylinders & secondly they had a C.C. to reed block opening & carb mounting stud location to accept the Carter carb used on the 20H & 55H. Later Mercury came out with the conversion kit for the 20H's with the Tillotson KA7A carb and APBA allowed those to be used on the MK55H as well.

[Mark75H]

1959 Mk55H's came with the KA7A, that's why they were allowed to be retrofitted to earlier 55H's and 20H's

Yes, early fishing 55's were sandcast, all 55H's are diecast

[194265]

My answer was for Mark 55's not Mark 55H's.