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Replace RR block with Std. Rotation block
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robdubbleu View Drop Down
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote robdubbleu Quote  Post ReplyReply Direct Link To This Post Topic: Replace RR block with Std. Rotation block
    Posted: May-28-2019 at 4:09pm
Hey folks,

I've got my mid 70's engine at a machine shop for a rebuild. They told me the cylinders have already been bored 60-over and they don't recommend boring them any further, which they would need. My engine is reverse rotation, of course and has a 2-piece seal. I've found a new complete engine (minus the PCM marine stuff) from the mid 90's (non EFI). I believe that engine will be standard rotation (and probably a one-piece seal). I'd like to use that block (and crank, if necessary) but will have it re-built just so I know it's in tip-top shape.

I'd like to basically have the new engine re-built in reverse rotation. What are my obstacles regarding the seal/crank/etc?

I would consider keeping it standard rotation, but I've already got a new cam from Cam Research ready for it.

TIA!

*Edit: Incorrectly stated the cam was from Comp Cams. Fixed to say Cam Research*
1976 Ski Nautique (PCM 351) - Currently under major renovation: floor, carpet, interior, gel coat, engine overhaul - ALMOST DONE!
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woodyelc View Drop Down
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Points: 378 		Post Options Post Options   Thanks (0) Thanks(0)   Quote woodyelc Quote  Post ReplyReply Direct Link To This Post Posted: May-28-2019 at 4:46pm
The crankshaft on the late model is the same for both rotations the seal makes the difference. Use all you can off the RR motor so that the new one will turn the correct way.
woodyelc
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robdubbleu View Drop Down
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Points: 120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote robdubbleu Quote  Post ReplyReply Direct Link To This Post Posted: May-28-2019 at 4:51pm
So the old crankshaft will work in the new block?
1976 Ski Nautique (PCM 351) - Currently under major renovation: floor, carpet, interior, gel coat, engine overhaul - ALMOST DONE!
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woodyelc View Drop Down
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Points: 378 		Post Options Post Options   Thanks (1) Thanks(1)   Quote woodyelc Quote  Post ReplyReply Direct Link To This Post Posted: May-28-2019 at 4:58pm
No use the crank that is in the late model just change the seal to a RR one piece.
woodyelc
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KENO View Drop Down
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Points: 11061 		Post Options Post Options   Thanks (1) Thanks(1)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: May-29-2019 at 8:51am
If you're looking for a new one piece RR rear main seal here's a place that has them at a reasonable price

link

Or you can get one at SkiDim for a little more ................part number 1141

You can also get a smooth Timing cover seal for you RR engine at SkiDim ,,,,,,,,,,,,,,part number 1134 or get a Felpro 17795 at any auto parts store
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Waterdog View Drop Down
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Points: 2020 		Post Options Post Options   Thanks (1) Thanks(1)   Quote Waterdog Quote  Post ReplyReply Direct Link To This Post Posted: May-30-2019 at 11:38am
On a stock 351w engine the piston pin is 1/8 off set so the piston doesn't rock as much at the bottom of the bore. On a R/R engine the pistons are reversed on the rods for that. What I did was switch banks port & starboard. Lightly honed the cylinders and put it back together with new rings & bearings. Cam research Cam, Ported GT-40p heads, intake, 540 prop. Rune really, really well.
- waterdog -

78 Ski Tique

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woodyelc View Drop Down
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Points: 378 		Post Options Post Options   Thanks (0) Thanks(0)   Quote woodyelc Quote  Post ReplyReply Direct Link To This Post Posted: May-30-2019 at 2:40pm
FYI the pistons are not reversed on FORD only on GM
woodyelc
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KENO View Drop Down
Grand Poobah
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Points: 11061 		Post Options Post Options   Thanks (2) Thanks(2)   Quote KENO Quote  Post ReplyReply Direct Link To This Post Posted: May-30-2019 at 3:00pm
Originally posted by woodyelc woodyelc wrote:

FYI the pistons are not reversed on FORD


I'll go along with that

I've had enough 302/351's apart both normal and reverse rotation to know that I've never seen the notches facing backwards on the pistons

And the part number for the pistons are the same regardless of the rotation of the engine
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