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  1. P

    Which water pump system is better?

    Still working on converting the old 1974 318 cui 270 Chrysler to 1977 360 cui engine. The old 318 utilized a double impeller fresh water cooling system and the 360 has single impeller to furnish fresh water with block type water pump (similar to vehicles) to circulate it. I can use either one...
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    Risers or flapper bellows?

    Finding a 280 transom shield and Y-tube up here could be dicey. I'll see what the local marina mechanic has thrown out back in his junk heap. The million dollar question is will the 270 outdrive bolt up to it? I can't see the other side in the image you posted. Let's see if I can find one on...
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    Risers or flapper bellows?

    I think I posted an image of inside transom before. Let's see ... yes here it is. This was with the exhaust Y-tube that came with 360 engine that I elected to not use because the exhaust bypass is plugged and because, as you can see, it definitely does not allow for clearance of the steering...
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    Risers or flapper bellows?

    Thanks. A 270 outdrive is what I have to work with. Flapper on the exhaust 270 outtake is gone and replacement is no longer available. Below is a Barr brand Chrysler manifold and 6" riser kit. Riser is what THEY call the extension that lifts the exhaust six inches vertically...
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    Risers or flapper bellows?

    I'm wrapping up the conversion from 318 to 360 Chrysler and about to drop the new engine in the boat. The 360 has risers but the 318 did not. Just ninety degree elbows off the end of manifolds. That old 1974 Volvo 270 outdrive originally had the flapper on exhaust port but when that blew off...
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    Heat risers or no heat risers, that is the question ...

    Thanks for clearing that up Rick. My idea wouldn't have done anything to relieve exhaust pressure. I'm thinking that making that Y-tube work is just too much hassle. Given what I have for manifolds and risers, I would have to add welded fittings and frankly I'd always be concerned the welds...
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    Heat risers or no heat risers, that is the question ...

    Here's a a typical heat riser with elbow setup. I posted photos of the exhaust setup with sealed off auxiliary port which you indicate is probably for back pressure relief when the boat is sitting idling. Makes sense. I see at the end of each manifold there are large ports sealed up with...
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    Heat risers or no heat risers, that is the question ...

    This image shows the plug in auxiliary exhaust port for 360 exhaust system.
  9. P

    Heat risers or no heat risers, that is the question ...

    Here's some photos of the exhaust swap. First, old 318 exhaust from manifolds to transom shield, engine side Same thing from transom side And here's the 360's exhaust system (formerly mated to unknown outdrive) mounted to my old 318's 270 Chrysler transom plate. As you can see, I will...
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    A flywheel issue

    Okay, here's some photos. First, flywheel covers, left is 360 and right is the boat's 318 I want to replace it with. Now the flywheels: 360 engine's with 160 tooth on left and 318's with 122 teeth on the right And here's the transom shield I have also started a new thread re the exhaust...
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    Heat risers or no heat risers, that is the question ...

    I'm replacing the 318 in my Chrysler/Penta 270 with a 360 engine. We're working through complex flywheel/bell housing issues in another thread but something else of interest I'd like to throw out. The exhaust tube system for the newer 1977 360 (of uncertain outdrive) mates to my 270 outdrive...
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    A flywheel issue

    Hi. New to the forum and have a challenging and complex issue to deal with. Need some expert advice. I have an older 1974 Chrysler 318 on a 270 outdrive in a 24' Fiberform. The 318 went belly up a few years ago (camshaft issue) and I'm finally trying to get it back in the water. I picked up a...
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