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A friend of mine has this for sale on eBay
anyone notice what is unusual about this?
anyone notice what is unusual about this?
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cracked webs in the upper ports pictured? -
No, no cracks, the picture is just a little fuzzy.
This motor is different from "regular" Mark 75's in some way very visible in this picture.Comment
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hmmmmmmmmmmm
Besides the ports looking small. it looks as though the sleeves had rotatedDon't laugh.....it's borrowed!!Comment
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No, its more obvious than that. The appearance of the sleeve being rotated is just a little camera lens distortion/shadowing.
You guys are looking waaaay tooo close.Comment
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I'll Guess...
Ported the same as a Mark 55-H. As, if I'm not mistaken, a Marathon Six was a60 Cubic inch motor, or 1/3 more of a 55-H...Comment
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Oh! A Three Screw Port Cover...
Interesting...It is a three screw port cover block but is a two screw cover in take port block.. CIRCA 1960, which would have made it a replacement Mark 75-H block...Six/Four port cover motor, three port cover screws!!!
That's my guess!Last edited by Ron Hill; 01-08-2011, 10:28 PM.Comment
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# of port covers
Its a very late mark 75. It has 3 port covers like the Mark 78. My dad has one too. Otherwise I never would have known either...
J-DubComment
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Simple
Old Merc intake ports are usually round, but those pictured are oval.Comment
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Ron is right ... a replacement block. All post production replacement 60 ci blocks were the same 3 cover casting instead of the original 6 cover version.
Porting is normal ... by the time the 6's were being made, all Merc ports were oval.
Here's the link to the eBay listing:
http://cgi.ebay.com/ebaymotors/ws/eB...m=260718161540Comment
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Hi Sam,
So where can I acquire a legit 75H? I know if anyone out there is in the loop, it's you.
JoeComment
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?? for you , the 55-H engines, were the intake and exhaust ports raised 60 thousandths
higher than the 40 H.P. fishing engines ??Pure of heart : Outlaw by nature
"choice not chance determines destiny"
"the race is never quite over , the course is never quite ours"
how many years must a man pay for mistakes he did not make?
here is a link of a little bit of Randy s racing history and a tribute to the late Ken Krier to learn more click the link
http://www.boatracingfacts.com/forum...221#post107221Comment
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That is correct.Originally posted by RandY Aveline View Post
I know of no 75H's or parts for sale at this time, but a number of lower units have gone unaccounted for as some collectors have aged ... you never know when something will pop up.Comment
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if anyone wants a mark 75...especially if it is join our FE ranks...I'll bet I can hook you up with a powerhead and any parts for it you might need. I would think a Bass gear foot would handle it.I have a "secret" source of all manner of merc parts.Comment
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Standard blocks or blocks already converted for racing?Comment
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