They are both hard to find and expensive. LOL
Poly Eng Knowledge Needed
- Thread starter Murray
- Start date
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Yep, oughta sell mine haha
All the above is good info. Bottom line is the poly is a great engine with all kinds of power possabilities, looks way cool, different to most people, but.. they get into a pocket, but what build does not??? Mr. Toth is considered the go to guy by many.
I am doing a trade for a running poly 318 Aug1. for my 62 Dart more door! Pretty excited.
I am doing a trade for a running poly 318 Aug1. for my 62 Dart more door! Pretty excited.
dartfever
Well-Known Member
I did find on my heads, the intake ports were great, but my exhaust ports needed help. They seemed way off to what Gary has experienced. Maybe just a bad set. I think a 360 poly would be the best size for these heads. You can go bigger, but I think the heads, even with full porting, become a limitation. Just the same as stock wedge heads.
abdywgn
dismantler
dartfever, not that I have any experience with the engine or heads, but it seemed to me that would be a great combo. Or maybe just a cut down 360 crank in the Poly.
abdywgn
dismantler
Thought I was the crazy one, but great to see the possibilities of the poly engine.
Polys were stopped for two big reasons, 1: they cost more to produce per unit and two, the sheer weight. They weigh almost as much as an RB block. And are WIDE AS HELL.
But yeah, the exhaust breathing leaves some to be desired
Steal
Yup, complex and expensive valve gear. Same reason the Hemi was halted for the B motor.
The poly is forth the guy that appreciates making power from something different, likes the challenge is not afraid to spend some $$. Otherwise just build another SB stroker??
dartfever
Well-Known Member
They are DAMN heavy! I replaced the heads with the engine in the car. Tried to go over the fender and it pulled my feet off the ground. Had to stand on the K member and lower them on that way. And if the OP does buy one, just make sure you don't get a Canadian special hydraulic cam engine. That valvetrain is a PITA!
W0w some great looking engines , and like mentioned you don't see them often After seeing all those pics I'm feeling sick spending all kinds of money on 3 340 engines , would like to build one of those poly engines just to be different .
dartfever
Well-Known Member
If I have to do a rebuild on this one, that is the route I'm going. 360 crank with 318 mains. Bore .090" over since you can with these blocks. And give the heads some more attention. The intake side on mine flow 220 at .450 or .500 lift. The exhaust is another story.
I was over at a friends house this morning and took a pic of this 318 poly with 4sp that has been sitting in the shed for 30-40+ years. He thinks its a '62 or '63.
His family has lived in the same property since the 40s.
His family has lived in the same property since the 40s.
mygasser
Well-Known Member
just like guys building ford fe motors, except there's more aftermarket support for them of course.
neil.
stroked340
Well-Known Member
someone say poly ? maybe this is a teaser . what ya think ?
Perhaps Gary is trying something new. Who knows, you’d have to ask Gary that if true.Hmm,really.. then why is the engine builder I know building Garys stroker
Gary has been around and working on these polys and has long been considered by most people to be “the guy” to go to for polys. Doesn’t mean there isn’t others out there or that someone hasn’t stumbled onto something better. But that doesn’t discount what Gary has done and the knowledge he has shared over the years.
abdywgn
dismantler
Dig out the old Direct Connection manual. There a ideas in there that are probably still valid...given that the parts are still available. Talking with Mr.Toth, his recommendation was not to use an intake valve over 2.00" because it could run into water. Compared LA and Poly rocker shaft today, my eye ball micrometer says they look like the same length and diameter but mounting holes in different locations.
earlymopar
Well-Known Member
This is my current poly in my 65 Dodge which is a test mule for the new engine that I'll install this winter. Stock displacement, ported, bigger valves, 1.5 / 1.6 rockers, Magnuson on modified Weiand 7503 manifold, Ford 351 headers, reground factory cam to new profile, etc. etc.
- EM
- EM
earlymopar
Well-Known Member
Nat:
There used to be a couple of manufacturers that made manifolds for the LA small block to adapt their superchargers but I'm not sure if there are any available now. Perhaps the other members here will be able to answer your question. Often, especially if you're trying to fit something different, you will just have to create your own by modifying an existing manifold to fit the supercharger you want to use. The manifold I modified was a Weiand single 4 barrel.
- EM
thats very cool , but is there a manifold for a jimmy blower like a 4-71 or 6-71 ? i could top plate mine and mount the blower atop the adapter plate .
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