Beware - many are reverse rotation -

 

Out of curiosity, why should it matter if its reverse rotation? Something to do with radiator flow? I mean Honda uses reverse rotation engines in cars just fine...and the only difference I can think of is that they also use cross-flow radiators instead of downflow.

 

I believe the distributor gear will show if its a standard rotation motor -

 

Watched a video on you tube.. they were putting one in a truck.. won't well. Is it true bottom. End has more torque. Less hours on motor was curious??

 

Is there a gut of used boat engines out there? Seems 302 or 351 from bone yard would be the simpler solution. Auto engines use anti-freeze that has anti corrosion additives. No so much for lake, or worse, salt water. I seem to have recognized more load on a boat engine than a car engine. What might seem a "bargain" might end up being a money pit...kinda like a boat.

 

Lol they say they are a good option low hours

 

They could be low hours but remember they are also some if the most neglected. While some are reverse rotation it's only one in a twin engine set up. I know a guy that loves to pick them up says the internals are stronger.

 

For sure I probly just wait for the mach 1 motor ..I think 71 351 clevland.. I hope guy comes through was ton 66 parts in car I couldn't use. Have 3 sets the 69 tail pieces. Ridiculous and no front or rear bumpers or emblems..

 

Boat motors are often run at high RPM’s for long periods of time, often with no warm up.

E or W coast, could have been run through, as previously noted, with salt water.

Plus the constant strain of pushing through water, rather than air.

 

I'm going take your guys advice..I sell it or put in one of my boats .. pickup something better ,, really want check out the mach 1 but guy still has it..4 bolt main came with the car.. hope there's no more stupid crap. I got parts don't even fit a 69..

 

Bumpers are missing also and passenger side headlight piece..mounts too fender

 

Most 5.0's are standard rotation. Reverse rotation engine are generally used with twin engined setups. And most twin engined setups use the bigger 5.8's. Or even bigger engines. I'm not a "boat guy" but I haven't seen any dual 5.0 boats. Doesn't mean they don't exist. But anyway, the 1985 Mustang GT camshaft wasn't made for that car, they just used a marine 5.0 cam grind designed for conventional rotation boat use. If you have a marine 5.0 with a roller cam, odds are it has a "Mustang GT" camshaft in it.
I put a truck 5.0 in my '67 purely as a placeholder for the 351W I finally put in it. Thinking of doing the same with my '69 as I have ready to run 5.0 and the 351W for it needs a full rebuild.

 

Yeah just a temporary motor while mach ones being built.. the early models work best for crossovers .. stronger bottom end I checked it out today its clockwise..make sure cams good be rolling

 

If it reverse rotation the the engine spins the opposite way…….

to the original poster, it is most likely standard rotation If it’s from a Cobra outdrive. OMC and Mercruiser for that matter started using the drives to achieve reverse rotation….guessing that was early 80s.

I understand it spins the opposite way...but why does it matter? Is it only because the factory radiator is downflow? I mean, say thast you used a crossflow radiator from a T-bird or something, could you then run a reverse rotation engine without issue?(always assuming your accessories are reverse rotation as well. not sure if that matters for the alternator?)

The crankshaft itself is reverse rotation. Twin engine boats use an engine of each rotation direction as opposite prop rotation is beneficial.

That does answer the other question as to why the marine motors were reverse rotation, I can imagine with 2 standard rotation engines the props would have a tendency to always induce a mild turn.

 

I understand it spins the opposite way...but why does it matter?

Just the camshaft. On many old school flat tappet cams it probably doesn't matter. But many roller cams don't have concentric profiles. The "lift" side is a slightly different shape than the other side of the lobe. With some cams you can even see the slightly lopsided profile shapes by eye.

 

What happens when you spin your driveline the opposite direction?

 

Why everything is wrong, it all goes backwards. Your camshaft is wrong, distributor gear is wrong, alternator, water pump, starter, trans, rearend all spin backwards. Its a NO GO-

 

The water flows the same way. The water pump will be made to do that. If and engine has a reverse rotation crank, the hatching at the rear where the rear seal rides will be opposite of a standard rotation crank so as to scrub oil back into the engine. If used in a normal rotation engine it will be trying to move oil out past the seal. Also, the camshaft is different.

 

I'll state the (hopefully) obvious. An engine spinning the opposite direction will output its power likewise in the opposite direction. Assuming everything bolts up, you now have a 3 or four speed in reverse and only one speed forward. Probably not what the OP is looking for.

 

lol, can't believe I didn't think about that. It does open some up some interesting possibilities though. IE: Use a reverse rotation engine in conjunction with a flipped Porsche(or I suppose Corvair) transaxle in some mid-engine build?(usual Corvair mid-engine conversions flip the transaxle upside down to compensate which requires some trickery). Though I guess that's a lot of headache when you simply use late model Corvette pieces instead. It would be useful I guess though in a rear-engine conversion on some car using a Subaru transaxle. Oh the crazy dune buggies you could build...

 

If you had an automatic you likely would not have any movement forwards or backwards. the vanes inside the torque converter would be faced in the wrong direction to transmit power…..

 

 

No, not really. There are all kinds of ugly spots on engine block castings. Look down the hole where the distributor goes, they all look like someone broke them with a sledgehammer in there. Every one.
If someone welded that I've love to have his name and number. People who can weld up big chunks of cast with such fine results are hard to find.

 

No, not really. There are all kinds of ugly spots on engine block castings. Look down the hole where the distributor goes, they all look like someone broke them with a sledgehammer in there. Every one.

Yeah I did look down cylinder wall . Dint see one on other side ..I was like no.. one cylinders has some scoring but it rolls over smoothly.

 

In some of the op's other photos of the block area there were grinding marks all around on the hump area in question, and it looked to me to have a weld bead there...so, I think there was some crack repair. If it is just a water passage under that area I would think the repair, done properly, would be ok. Op has been very busy with his posts, photos, and replies since he appeared 4 days ago.

 

I don't know im new here get bashed..

 

Motor of the day guys.. ant casting number guys. Good and bad of it ...1998 5.0 cobra HO motor ..what ya got in casting numbers..motor history cobra? Have awesome day mustang country

 

 

Wicked were u at bro

 

 

1993 valve covers. Casting numbers on intake come out 1976 5.0L. What's next supposed to be a 5.o cobra HO motor..

 

Just stuff I collected over the years apparently somebody got to it already