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Technical 4 cylinder mercruiser-engined cars

Discussion in 'The Hokey Ass Message Board' started by dennis g, Oct 9, 2015.

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  1. CNC-Dude
    Joined: Nov 23, 2007
    Posts: 798

    CNC-Dude
    Member

    A little hot rod ingenuity can make that intake work on the 181 head.
     
  2. It might be time to start over. The 153 head is on the left and the 181 head is on the right.

    Charlie Stephens

    IMG_6392.jpg
     
    OFT and justabeater37 like this.
  3. CNC-Dude
    Joined: Nov 23, 2007
    Posts: 798

    CNC-Dude
    Member

    One of my Chevy 250/292 triple side draft intakes was recently used on a vintage 302 GMC engine with a little of that hot rod ingenuity. Jimmy six on here and Inliners has also used one on his Bonneville record holder Jimmy engine. The GMC head has round intake ports and the 250/292 has the same rectangle shaped ports as the intake above. It wouldn't be hard to use the one shown above on the 181 head.
     
    Last edited: Oct 18, 2017
  4. RoddyB34
    Joined: Oct 13, 2009
    Posts: 524

    RoddyB34
    Member

    1929cdan what intake is that ,,? Seeing as there is 3 variations in the port shapes on the 181 marine heads and the 153 head ,,matching the manifold to the ports presents a dilemma ,,I have a 181 head which is the same as the in Charlie's picture ,,which I got off Charlie ,,thanks again Charlie ,,I will be making an intake from rectangle tubing ,,,I have had 10mm thick plates laser cut to enable exhaust headers to be made also,,
     
  5. 1929CDAN
    Joined: Mar 18, 2006
    Posts: 339

    1929CDAN
    Member

    Stock boat intake cut down till it looked like a car manifold. But I made a new top for it and turned the carb so I had room to hook up cables .
     
  6. Six Ball
    Joined: Oct 8, 2007
    Posts: 2,548

    Six Ball
    Member
    from Nevada

    The mounting holes appear to be in the same place. It would be a simple matter of modifying the ports. Even I could do that.
     
  7. Six Ball
    Joined: Oct 8, 2007
    Posts: 2,548

    Six Ball
    Member
    from Nevada

  8. RoddyB34
    Joined: Oct 13, 2009
    Posts: 524

    RoddyB34
    Member

    This is my answer to the 8 port head / manifold problem ,,as I'm in Australia we don't have any of these engines except for boats ,,mine is an ex boat engine ,,the head was rusted out ,Charlie Stephens was very kind enough to sell me a nice bare head and drop it to my shipper ,,I'll have to take my chances with the block it looks ok ,I had some header plates cut at my local laser cutter to the relevant port configuration gasket ,,this is the start of my intake manifold ,,rectangle tube and a grinder ,,I will form some in fills and get it tig welded ,,carb unknown at this stage so will make a suitable plate later ,,
     

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  9. Mr. Mac
    Joined: May 16, 2005
    Posts: 1,781

    Mr. Mac
    Member

    Here is the intake we had made for our 181 it works real well. chev 4 eng dyno 055.JPG
     
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  10. RoddyB34
    Joined: Oct 13, 2009
    Posts: 524

    RoddyB34
    Member

    That's pretty fancy ,,got a few more ponies than mine,,
     
  11. Here is my intake/ exhaust under construction. I had a flange plasma cut from gasket pattern and modified a V8 Chevy header to fit. Going into my 1950 Nash with 350 turbo trans

    [​IMG]
     
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  12. 724wd
    Joined: Sep 14, 2007
    Posts: 13

    724wd
    Member

    Hey fellas! I lucked into a '62 153 with the motor mounts, distributor, intake (exhaust has a big chunk missing), Chevy script valve cover, and a few other nice pieces still in place... for $50! Anyway, I'm debating using the original motor mounts but there's not a factory cushion available for the '62 that I can find. I can get a Jeep DJ5 mount which is the same engine, but not sure if the same mounts. It's just a rubber block with a bolt sticking out... not TOO complicated! Or my other idea was using one of the universal '49-51 ford type bolt-through cushion. What direction would you all take?
     
  13. Six Ball
    Joined: Oct 8, 2007
    Posts: 2,548

    Six Ball
    Member
    from Nevada

    See if you can find a Anchor or other motor mount catalog and just go through it. I'm sure you'll find something that would work.
     


  14. I understand the Chevy ll mtr mounts are as rare as aluminum 427 engines
     
  15. CNC-Dude
    Joined: Nov 23, 2007
    Posts: 798

    CNC-Dude
    Member

    I have header flanges available for the 153 cylinder heads if you didn't know....

     
  16. manyolcars
    Joined: Mar 30, 2001
    Posts: 7,572

    manyolcars

    how much $?
     
  17. CNC-Dude
    Joined: Nov 23, 2007
    Posts: 798

    CNC-Dude
    Member

    Keep in mind, mine are designed and created using 3D modeling software to ensure the ports cross section isn't reduced below 1-5/8" tubing. Many issues arise when simply scanning a gasket and you often end up with the tube constricted down to the equivalent of 1-1/2" instead of the 1-5/8" you are expecting and just don't know it. When using irregularly shaped ports, most people simply have no way to measure and verify the circumference around the port is the same as the round tube they're trying to fit into it, unless you have the means to create it using these more precise and modern methods. Not knocking any one that does that, but they would be surprised to know they have defeated the purpose of making their own headers only to end up reducing the tubes effective size right off the get go.
    $45 to HAMB'ers plus shipping. 3/8" mild steel and true 1-5/8" tube size.
     
    Last edited: Jan 31, 2018
  18. Count Scrapula
    Joined: Oct 13, 2004
    Posts: 585

    Count Scrapula
    Member
    from Mid TN

    I did one just like this once.


    Sent from my iPhone using The H.A.M.B. mobile app
     
  19. Six Ball
    Joined: Oct 8, 2007
    Posts: 2,548

    Six Ball
    Member
    from Nevada

    Does anyone have pictures of boat intakes cut down for car use. Would especially like to see one of the two carb manifolds. I saw the beginnings of one in Reno a few years back. I don't know if it was ever finished.
     
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  20. Marty Strode
    Joined: Apr 28, 2011
    Posts: 3,851

    Marty Strode
    Member

    I recently mounted a 181 in a 29 PU. IMG_1081.JPG IMG_1084.JPG
     
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  21. Six Ball
    Joined: Oct 8, 2007
    Posts: 2,548

    Six Ball
    Member
    from Nevada

    I like those mounts. Are using those and then a single trans mount? Nice steering too.
     
  22. Since you brought up the subject of mounts here is a picture of mine on my AVATAR. The stock mounts are bolted to the engine and a stock rubber mount is used (I have heard they are hard to find). Right side shown, left is similar. Mount on trans is stock to the original K member.

    Charlie Stephens

    IMG_5528.jpg
     
  23. Six Ball
    Joined: Oct 8, 2007
    Posts: 2,548

    Six Ball
    Member
    from Nevada

    Charlie, Thanks I've see pics of your car before. Nice job. I bet it's fun to drive.
     
  24. Six Ball
    Joined: Oct 8, 2007
    Posts: 2,548

    Six Ball
    Member
    from Nevada

    Have any of you used a roller cam from a 151 Iron Duke in a 153-181 block?
     
  25. It is harder when there are several good options, I have done the first three::
    1. go to a parts store and look in every box of motor mounts they have. Buy what looks good to you.
    2. cut up an agricultural implement tire (because they have no wires in them).....expect lots of smoke if you use a cut off wheel for a through hole sharpen a tube spin it in a drill press to make your hole.
    3. walk around a junk yard, buy what you think will work. Expect to pay 1% of the dealer retail price.
    4. buy the pretty little round mounts used on old fords
    ( I made bump stops for a rear axle from 1 lb rubber mallets)
    Rubber can be turned in a lathe if you have a very sharp cutting edge. For that I use a parting cutter.

    Rubber mounts can be molded. Beg some uncured rubber from a vulcanizing plant cut it up compress it tightly into a metal mold and bake it at 350 degrees until it cures (20 to 30 minutes ). cook it outside in a toaster oven to keep the house smelling nice.
     
  26. RoddyB34
    Joined: Oct 13, 2009
    Posts: 524

    RoddyB34
    Member

    2E535CB0-EE7D-482A-AF95-57BD2B687D03.jpeg F7813D8F-FDDB-43FE-9476-0940718A5232.jpeg 41088908-29B8-4FC1-8152-EBE3D5AE24B5.jpeg View attachment 4222389 View attachment 4222390
    Against all popular opinion I’ve used a steel bellhousing adding mounts to replicate the original bellhousing setup including the Radius rod mount ,,,using a hurst style straddle mount at the front,,vibration seem negligible at the moment when running but a road test soon will show what amount ,,
     
    Oldioron and Tim like this.
  27. 1932tub
    Joined: May 31, 2005
    Posts: 356

    1932tub
    Member

    Does anyone have cam specs for a mild street driven cam?
     
  28. 34Phil
    Joined: Sep 12, 2016
    Posts: 168

    34Phil

    Impco sells a pricey 181 manifold and adapter to Rochester 2 bbl or 4 bbl or check with someone like Helmarparts.com who sell complete engines for $ of intake and exhaust manifolds. Intake will still be gaseous only so will need carb adapter. 2nd pic is to throttle body but close enough for demonstration here.[​IMG] [​IMG]
     
    Last edited: Mar 15, 2019
  29. RoddyB34
    Joined: Oct 13, 2009
    Posts: 524

    RoddyB34
    Member

    This forklift LPG manifold turned up on our local Gumtree sales ,,would have been good to run 2 carbs on the 1st runners ,,but I’d already completed my manifold,,
     

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  30. Oldioron
    Joined: Dec 12, 2018
    Posts: 459

    Oldioron
    Member

    I don't know what it makes for power but it's got the look!
     

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