fury_19

ok guys i have always assumed i had a 318 in my fury but now im not sure..... i was talkin to a guy about the diff between a 318 and a 318 magnum and he showed ne the easy way to tell the difference was the number of bolts that hold the valve cover on... 5 for a normal and 10 for the mag... but mine only has 2... so wat is it? i have pics on my album it has a rear dist so its not a big block.... wat could it be?

theomahamoparguy

You have a polysphere 318 {i have not looked at the album}
they have two bolts holding the valve cover down. Last year was 1966 for the "poly".

64fury

Hmmm! always thought the 318 had a 5 bolt valve cover and the 318 poly had 2 bolts in the center of the valve cover! Your pic shows 2 bolts, so i would assume you have a 318 Poly!

fury_19

ok so wat else do you kno about the polys? is this a good or bad thing?

theomahamoparguy

alot of the parts interchange between the Polysphere and the LA 318 {means later A engine}. Has the same bellhousing for the transmission {so you can bolt up a "newer" 318 to your trans} the distributor will swap, the crankshaft will swap {poly cranks were forged!!} The timing cover and water pump should swap. the motor mounts will swap. the rods (90% sure) and the carburetor will swap. Or you can keep the poly and upgrade it if you like. You can still get parts for them.

64fury

Weren't the 66' poly's rated as a 317? or was that the 56'?

fury_19

well the guy has a set of heads for a L-a 318 and a Mag but coulld i turn my poly into a mag?

fury_19

according to the green book its 318

theomahamoparguy

No, the LA heads will not bolt up to the Poly block according to everything that I have read.

theomahamoparguy

Note: I have never personally tried to bolt LA heads to a poly block. I've just heard that it cant be done.

fury_19

just my luck...so i bassically have a ***** block in my car and no hope to build it out huh?

bigsho

i have a buddy that has a '64 fury with the 318 poly. he built it up quite well..its pretty damned mean. if i remember right...he had his heads reworked at a local machine shop. the hardest part was the cam...think he had to have one made...and he had a hard time finding an intake manifold for it. took him a bit to get all the pieces together and cost him a pretty penny but in the end its a screamer

fury_19

well im for cheap and fast lol... that was the whole muscle car theme right? but i was just hoping to rebuild it for later use or maybe for a project 4x4... ill just swap it for a LA cuz i really want to build a MAG now

pjmopar

Hi , i have a 318 poly in my Plymouth and i think it is a very good engine.This is a web site ,Diamondback Engines .There are other websites for the poly.I was on a site the other day and they can get 500 hp out of these engines fairly easy .Good luck

fury_19

thanks for the forward on diamondback yeah they arent to far from here so ill work with them on the rebuild wen i get to that part... for now i gotta get my 440 and start workin on it

67 GTX

the poly was discontinued because it got terrible gas mileage, and it wasnt much more powerful than the regular 318

fury_19

isnt it almost like a hemi tho?

67 GTX

kind of
it a polyshperical head
think of it as a semi-hemi

67 GTX

it didnt require the dual rocker shafts
the combustion chamber was round, but the plugs went in from the side