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  1. #16
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    Jun 2009
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    Lake Hartwell, SC
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    Well, got both valve covers polished! Bought a new air angle polisher and coarse, medium, and fine scotch pads- DEFFINATELY made the job easier!!! I may do the tops again, to erase any little pits/ scratches left, but the shine is there, now! Big improvement!
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    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  2. #17
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    Jun 2009
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    Lake Hartwell, SC
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    Ok, got the heads CC'd.... and got some interesting numbers.....
    I'll cut to the chase,

    compression chambers all ranged from 121-122 cc's

    Intake runner volumes ranged from 251-253 cc's (much smaller volume than I had thought, but good for port velocity! )

    Exhaust runner volumes ranged from 125- 130, with almost all at 126 or 127.

    Sorry, couldn't get pix, since my hands were constantly wet, or greasy, or just plain dirty.... sorry.

    The interesting thing with these heads is they have the heart shape open chambers, huge 2.25/ 1.88 valves, and in my opinion, very small intake runners ..... leading me to believe from Internet research, that they will keep high intake speeds, and coupled with a tunnel ram, hopefully will create a very good "ram effect", and with the large vslves, should scavenge pretty well....... I hope I'm right... the recomended can comes with long duration, and relatively high lift, so shouldn't the combination be pretty well matched? I know You never want intake runners too big- kills velocity, and you want the larger valves to displace more air volume, but my question is, with @ 252 cc intake runners, and the volume of the intake runners on a tunnel ram, do they "add together" for intake runner volume, and compliment each other in the combinstion, or is the 253cc head intake runner a "choke point"?
    Any advise, input, or sugestions?
    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  3. #18
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    Jun 2009
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    Lake Hartwell, SC
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    It seems to me, even though these are rectangular port heads, they actually compare a bit closer to the ovals?
    Yes, no, maybe?
    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  4. #19
    Join Date
    Jun 2009
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    Lake Hartwell, SC
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    Well, got my two Predator carbs delivered, with the Moroso fuel regulator, and promptly ordered two complete overhaul kits for them. Super simple design, and very interested in the variable venturi aspect of them, in my combo. Going to be a learning curve, for sure. My nostalgic look and experiment, may fail, but I have to try first, before I change to more modern carbs. But, I DO hope they work great for me!
    I fooled around for about 5 minutes on one, trying to polish it up some, and can see with alot more effort, they'll look pretty nice!!
    OK, off to the lake today (pontoon day with wife n dogs- gotta keep the "garage widow" HAPPY!!!!!)Click image for larger version. 

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    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  5. #20
    Join Date
    Jun 2009
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    Lake Hartwell, SC
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    Ok, FINALLY found the machine/ speed shop for my project! !!
    http://www.atlantaspeedshop.com/home-page.html
    These guys do alot of hi-performance marine work, and engine building for professional racers!!!
    It'll cost me more, but totally worth every penny, when it comes to the quality and pro experience they have! Every question I had was answered AND a ton more info, on things I hadn't even thought of yet!!!

    Ok, moving on... I wanted my block to have a smoother look and "pop" a bit better once painted, so I prepped it tonight, so I can drop it off tomorrow, or Saturday.
    I ground off all sharp edges, removed all casting flash, and smoothed out the oil return galleys for better drain back. Covered in metal pieces, but every things a small step towards the final reward!!!
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    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  6. #21
    Join Date
    Jun 2009
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    Lake Hartwell, SC
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    A quick question..... my block has no head dowels, does that mean it's been decked, or shaved?
    I was planning on 0 decking my block for a better "quench", but prepping the block, tonight, for the drop off, Is when I noticed the lack of dowels? Any input? Any way for me to check if it's been shaved?
    The list of machine work is deep, that I plan on doing....
    Vat dip, bore, torque plate hone, align bore, 0 deck block- .020 shave, cam bearings, clearance block for stroker kit, shave/ mill heads .020 to bump compression by -6cc's, and pin the rods. About $1400....
    If I want to let then assemble the bottom end, about $585 more, whick, I'll probably do, since they will give a guarantee on the short block if they assemble.
    So, 2 more boat "units" to get closer to my goal.
    One more boat unit for the hyd. roller cam kit, so should get me pretty close to about $8K this far on the engine!
    BBC, does NOT mean big block chevy, it means BIG BUCKS CHUMP!!!! LOL!
    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  7. #22
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    Jun 2009
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    Lake Hartwell, SC
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    Ok, I'm still waiting on getting the engine block n stuff to the speed shop, since last Thursday morning, after I had loaded everything into my truck to drop off, while working in ATL, my tranny decided to dump at 5am on the way in, so had to limp it home and unload everything! Anyhow- still don't have my truck back, and as much as my much better half loves me and fully supports this project..... she said, "HE'LL NO"!! To trying to load everything into her LT- loaded, leather, etc.. Tahoe!!!
    Should get my truck back tomorrow, Friday...I hope!!!
    But!
    In the mean time, I ran across another tunnel ram, and bought it, because it's already polished.....
    But! Now I'm not sure if it's what I need? It's smaller on the open intake top, and the runners are not fully exposed to the air for a cooling charge effect... they're actually heated by the hot oil on the bottom side of the runners.
    I have no problem doing or paying for polishing (probably DOING- for more hands on!) Of the other tunnel ram, my concern is more of keeping the BEST one for my build, and selling the other......
    Ok.... pix time....
    Let me know your thoughts, based on my build.....
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    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  8. #23
    Join Date
    Jun 2009
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    Not much to update right now.... the engine is still at the machine shop being worked on, but I did pick up a nice small body Mallory magnetic breakerless distributor for the tunnel ram!
    Hoping that it won't be too much longer to get the engine back!
    Attached Thumbnails Attached Thumbnails 20160721_202533.jpg   20160720_170027.jpg   20160721_202516.jpg  
    1985 Checkmate Enchanter, 1987 Merc 200HP Black Max 2.4 carb motor

  9. #24
    Join Date
    Jan 2002
    Location
    new york babylon
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    Nice job had a few jets keep goin

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