1972 351 H.O Cleveland
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1972 351 H.O Cleveland

  1. #1
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    Default 1972 351 H.O Cleveland

    Hello, new here, does anyone have any info on exhaust for 4v Cleveland heads ? Also need some mounts so I can put this in a 18 Ft. 1972 Cheetah Jet Boat that I just bought cheap.

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    Already miss the 310/562 2manymustangs's Avatar
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    OH MAN, this could be tricky... is the 351C a factory install and does it currently have marine exhaust???

    Are you sure it's a 351C and not a 351W (351W is a very common marine engine)???

    It's hard enough finding custom headers for cleveland heads (2v and 4v) let alone jacketed exhaust for a boat...

    I'm building a set for my new BOSS 347 build going into a CAR... THis should be interesting to see the responses...

    There are a variety of thick 351C flanges (2v and 4v) available from Jegs/Summit for custom builds, fire up your TIG torch...
    Last edited by 2manymustangs; 08-13-2013 at 05:29 AM.
    Pat Eason, the voice of reason...

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    Default 351 H.O Cleveland.

    Quote Originally Posted by 2manymustangs View Post


    OH MAN, this could be tricky... is the 351C a factory install and does it currently have marine exhaust???

    Are you sure it's a 351C and not a 351W (351W is a very common marine engine)???

    It's hard enough finding custom headers for cleveland heads (2v and 4v) let alone jacketed exhaust for a boat...

    I'm building a set for my new BOSS 347 build going into a CAR... THis should be interesting to see the responses...

    There are a variety of thick 351C flanges (2v and 4v) available from Jegs/Summit for custom builds, fire up your TIG torch...
    Yes am absolutely sure this is a 4 bolt main/ 4v head 1972 H.O Cleveland. Intake valves are 2.19 exhaust is 1.71. exhaust ports are about 2.5 in. in dia. This is the engine I am going to put in this boat, one way or another.

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    Already miss the 310/562 2manymustangs's Avatar
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    Quote Originally Posted by Jim Bob View Post
    Yes am absolutely sure this is a 4 bolt main/ 4v head 1972 H.O Cleveland. Intake valves are 2.19 exhaust is 1.71. exhaust ports are about 2.5 in. in dia. This is the engine I am going to put in this boat, one way or another.
    the H.O. heads should have a rectangularISH 2" x 1.74" exhaust port... the 2V heads have an oval exhaust port...
    Pat Eason, the voice of reason...

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    Default 351 h.o

    Quote Originally Posted by 2manymustangs View Post
    the H.O. heads should have a rectangularISH 2" x 1.74" exhaust port... the 2V heads have an oval exhaust port...
    It has been awhile since I have seen the exhaust ports in these heads. They have 4v exhaust manifolds on them right now, cuz the 2v exhaust manifolds would not completely cover the port. Found 4 v ones in a scrap yard south of Phoenix Az. All I remember was that the ports were huge for a 351.

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    In my 45 or so years dabbling with Ford parts and engines I've never seen a set of Jacketed exhausts for a Cleveland.

    You can get flanges, and I'm sure have them made to fit your boat by all the usual vendors.

    Check your account balance before you begin!!

    Good luck.

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    Default 351 H.O Cleleveland

    Quote Originally Posted by Rvr Rcr View Post
    In my 45 or so years dabbling with Ford parts and engines I've never seen a set of Jacketed exhausts for a Cleveland.

    You can get flanges, and I'm sure have them made to fit your boat by all the usual vendors.

    Check your account balance before you begin!!

    Good luck.
    So far I have only spent cash $500 for boat & $400 for motor. I was thinking about taking boat with motor in it t the guy who built the Cleveland. He has a custom muffler shop nearby, maybe he would cut me a deal since he would be working on the motor he built. If not there is always credit.

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    You will have to have a set of headers built or build them yourself .Go to Headers by ed, he has flanges .Get a header kit from him or speedway, and go from there.

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    Post some pics

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    Default 351 Cleveland

    Quote Originally Posted by dankdave79 View Post
    Post some pics
    351 intake port size.jpg (8.8 KB)ResizedImage_1390714842050.jpg 351 take 4.jpg (32.2 KBResizedImage_1390714882591.jpgResizedImage_13907 14918818.jpg
    I cut out rear 1/2" thick 6061 from a 2' square with a worm saw wood blade and axle grease "outside of plate". Inside was pretty much all day long with a strong jigsaw. Modified front 460 mount to fit Cleveland, had to put a home made spacer between harmonic balancer and crank gear and another one between inside of outer edge of balancer under bolt to end of crankshaft. In order to take up the difference of modified front 460 mount putting harmonic balancer out further then it was.
    So far That piece of 6061 Aluminum cost me about $145, jigsaw blades, grade 8 bolts and a few other miscellaneous parts, has been exceedingly cheap thus far. Granted there has been a lot of labor and or learning about all of this which I knew next to nothing. But I really needed a new hobby. I cut flanges off of rusted 460 Bassett headers which came with the boat, to fit Header flanges. Now I am getting into the more costly stuff, got to get headers attached to flanges, possibly re chromed after all done. Still need steering wheel rack & pinion cable system.
    Also made short torque tube from existing parts, and store bought short pipe and grade 8 bolts. This cost less than $10.
    Couldn't find flex plate cover so I used aluminum bell housing off of C-4 transmission.
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    Last edited by Jim Bob; 01-26-2014 at 01:29 PM. Reason: More pics and explanations

  13. #11
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    Sweet engine! I had one in my Mach 1.
    Your's is definitely a Cleveland!
    No way to tell if it is an H.O. Cleveland unless you pulled it out of a car and saw the data plaque showing the "R" code.
    Mine was just a 4 bolt main 4bbl engine till I changed the timing chain and gear. Which was the only difference between the "Q" code and "R" code engines.
    Of course... you could school me, but I owned, studied about and drove that beast for 7 years. (Strong clutch on those btw)

    Jairus

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    Quote Originally Posted by Jim Bob View Post
    351 intake port size.jpg (8.8 KB)ResizedImage_1390714842050.jpg 351 take 4.jpg (32.2 KBResizedImage_1390714882591.jpgResizedImage_13907 14918818.jpg
    I cut out rear 1/2" thick 6061 from a 2' square with a worm saw wood blade and axle grease "outside of plate". Inside was pretty much all day long with a strong jigsaw. Modified front 460 mount to fit Cleveland, had to put a home made spacer between harmonic balancer and crank gear and another one between inside of outer edge of balancer under bolt to end of crankshaft. In order to take up the difference of modified front 460 mount putting harmonic balancer out further then it was.
    So far That piece of 6061 Aluminum cost me about $145, jigsaw blades, grade 8 bolts and a few other miscellaneous parts, has been exceedingly cheap thus far. Granted there has been a lot of labor and or learning about all of this which I knew next to nothing. But I really needed a new hobby. I cut flanges off of rusted 460 Bassett headers which came with the boat, to fit Header flanges. Now I am getting into the more costly stuff, got to get headers attached to flanges, possibly re chromed after all done. Still need steering wheel rack & pinion cable system.
    Also made short torque tube from existing parts, and store bought short pipe and grade 8 bolts. This cost less than $10.
    Couldn't find flex plate cover so I used aluminum bell housing off of C-4 transmission.
    Napa Auto Parts told me that it is a H.O or Cobra jet, Australian Engine. My mistake, it is only a 2 bolt main but it has 4 bbl. heads, flat top forged pistons, and I'm not sure what cam is in it. Lobes looked good so I didn't take it out.
    Last edited by Jim Bob; 01-26-2014 at 01:21 PM.

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    Quote Originally Posted by bville View Post
    You will have to have a set of headers built or build them yourself .Go to Headers by ed, he has flanges .Get a header kit from him or speedway, and go from there.
    Yes, Headers by Ed will definitely be one of my purchases. Was thinking about picking up some finished Header flanges with starter tubes. Then hopefully find someone who operates a Tig welder "cheaply" to weld Header plates to 460 Bassett Headers that I cut down to match ports in my 351 Cleveland heads.
    Last edited by Jim Bob; 02-07-2014 at 08:07 PM.

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    Quote Originally Posted by Jairus Watson View Post
    Sweet engine! I had one in my Mach 1.
    Your's is definitely a Cleveland!
    No way to tell if it is an H.O. Cleveland unless you pulled it out of a car and saw the data plaque showing the "R" code.
    Mine was just a 4 bolt main 4bbl engine till I changed the timing chain and gear. Which was the only difference between the "Q" code and "R" code engines.
    Of course... you could school me, but I owned, studied about and drove that beast for 7 years. (Strong clutch on those btw)

    Jairus
    Nice Mach 1!!! I had a 1970 Cougar in H.S, which originally came with a 351 Windsor. Blew head gasket on Windsor then put a stock 2 bolt main with 2 barrel carb "351 Cleveland" in it. Stock Cleveland had a lot more balls than stock Windsor. I'll have too look at the code on boat motor again, can't remember now what it was.

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