318 Poly Engine

[old tired rebel]

How good is a 318 Poly engine and is there any High Performance parts for it?

 

[Histoy]

I don't mean to downplay the knowledge of the guys on this site, but I suggest that you also visit the 1962-1965 Mopar site. There is a lot of Poly info on that site, and there are a few Poly performance engine builders that contribute to the site.

 

[Meep-Meep]

I think they are fine, but performance parts are somewhat limited. The short block is nearly the same as a late 318 if not identical. I used to see this guy at the swap meets and for years he would drag this old poly Weiand dual quad low rise intake with him. I still see intakes around once in a blue moon. I believe the only reason it went away is it didn't fit in the A bodies. It's pretty huge for it's displacement.

If I had the opportunity I would build one for a hot rod just for the billet Chevy crowd to say WTF is that???

 

[old tired rebel]

I think they are fine, but performance parts are somewhat limited. The short block is nearly the same as a late 318 if not identical. I used to see this guy at the swap meets and for years he would drag this old poly Weiand dual quad low rise intake with him. I still see intakes around once in a blue moon. I believe the only reason it went away is it didn't fit in the A bodies. It's pretty huge for it's displacement.

If I had the opportunity I would build one for a hot rod just for the billet Chevy crowd to say WTF is that???

Wish I could have seen that intake.

 

[68383GTS]

I had one in a 1966 Charger and it was this biggest dog I ever owned.Very few performance parts.I would go with a LA,B,or RB engine.

 

[69HEMICORONETR/TCONV]

it's a Dog. I would go with a LA if I were going the 318 route.

 

[old tired rebel]

it's a Dog. I would go with a LA if I were going the 318 route.

Woof Woof Baby!!!!:rolling:

 

[69HEMICORONETR/TCONV]

Woof Woof Baby!!!!:rolling:

In my opinion the LA 318 is the Best engine of all time, They are tough as nails, very dependable, able to take 40 shade of **** and still keep on going,:grin: .....but they are not "powerhouse" engine and poor choices for performance.

 

[old tired rebel]

In my opinion the LA 318 is the Best engine of all time, They are tough as nails, very dependable, able to take 40 shade of **** and still keep on going,:grin: .....but they are not "powerhouse" engine and poor choices for performance.

And you say the Poly is a dog? So the 318 is a boat anchor? :rolling:

 

[Meep-Meep]

I saw a guy at the track in a 68 Barracuda fast back running 12.50's with a 318. It was built like a high performance 340, including the heads and the compression to go with and was running a .528 cam.

 

[old tired rebel]

I saw a guy at the track in a 68 Barracuda fast back running 12.50's with a 318. It was built like a high performance 340, including the heads and the compression to go with and was running a .528 cam.

I know how well a 318 can run once it's set up as a stroker motor. I had one in a D100 but my car is way to heavy. I was asking about a poly cause I seen my first one yesterday and wanted to learn more about it.

 

[daredevil]

they were a good motor in their day for pulling and haulin and general dependability. i have one and im thinking about pulling my 383 out of my 53 truck and running it.

 

[old tired rebel]

they were a good motor in their day for pulling and haulin and general dependability. i have one and im thinking about pulling my 383 out of my 53 truck and running it.

Poly or LA?

 

[joesnow]

I have not run one. But what I understand they are a low RPM engine. Fair torque,HP lacks. I hear that the poly pistons can fit a LA block and raise the compression. Something with the crank, but I don't remember. I'd put a 360 in where a poly is if a engine HP upgrade is needed.

 

[Meep-Meep]

The only problem I can see with the poly motor is the lack of high perf parts availability, thus not cost effective to build. Otherwise what do a Boss 429, Boss 302, 351 C, regular 429 and 460, MoPar 4.7 (like in my Durango), BB Chevy and the 318 poly motor have in common? How about superior valve arrangement and combustion chamber shape??