Sign in using an external account
Register Forgot Password?

submit to reddit
LinkBack Thread Tools Search this Thread Display Modes
Old 08-26-2010, 10:55 PM   #1
New Member
TallChris's Avatar
Join Date: Aug 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
318 poly to 318 wedge conversion

I've got a '66 satellite with a 318 poly (wide block) that needs rebuilding. If I pull it apart and can't salvage much, i'd like to put a more modern 318 wedge in it. I'm restoring it to be a daily driver - '66 is the last year they made that polysphere engine and some parts are really hard to find - the headers/carb aren't original and pretty shot, I suspect the crank is spun too. From what I can tell it's a pretty simple swap to a post-'66 318, but one engine mount will have to be custom built. Has anyone done that?
TallChris is offline   Reply With Quote
Old 08-27-2010, 09:02 AM   #2
A.K.A Bob Dodge
1966sportfury's Avatar
Join Date: Mar 2010
Location: couer d' alene id.
Posts: 1,526
Thanks: 0
Thanked 0 Times in 0 Posts
dang i thought it was just a drop in, ive done it before years ago i thought it used the same mounts, i think the wide block is a better engine as far as torque.

more and more parts are becoming available for the poly, check ebay?
chevy?!!? i own hot wheels faster than that.
1966sportfury is offline   Reply With Quote
Old 08-29-2010, 09:35 PM   #3
New Member
TallChris's Avatar
Join Date: Aug 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
I'd love to save and restore the poly, it's just a question of how much is salvageable. From what I understand, the poly peaks in it's torque curve sooner than any other comparable engine, more like a diesel. That means you can get a lot of power to the wheels without having to rev the engine or downshift.

I'm going to start to pull it apart next weekend if nothing else comes up. After I get it apart there is a local machine shop in Raleigh that has done the poly before. The valve grinding is the odd part, because the intake and exhaust valves are at different angles. I'll see what they have to say about the crank.

The problem with my car is in the lower block, when I bought the car it would loose oil pressure after running for 10 mins. No telling how torn up the lower block and crank are. The car shows 88K, I'm guessing from what I know about the car it probably has 188K on the factory engine, which has had a valve job once already.
TallChris is offline   Reply With Quote
Old 09-22-2010, 12:52 PM   #4
New Member
TallChris's Avatar
Join Date: Aug 2010
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Looks like I'm going to save the poly and rebuild it. I found a great site for 318-poly specific, if you are interested in poly's, here it is:

TallChris is offline   Reply With Quote
Old 11-30-2010, 12:40 PM   #5
Mopar Fan
Join Date: Aug 2010
Location: Bakersfield Ca
Posts: 97
Thanks: 0
Thanked 1 Time in 1 Post
If you were still interested in swaping a new model small wedge in its place it is easy. First off the 273 v8 was available in that car in 1967 . Use the stock brackets and motormounts and it drops right in. You can use the same exhaust manifolds from that application as well or get headers. The trans should bold right up.
condor74 is offline   Reply With Quote
Old 12-01-2010, 03:29 PM   #6
Mopar Lover
Join Date: Mar 2009
Location: Springfield NE
Posts: 834
Thanks: 0
Thanked 2 Times in 2 Posts
the motor mounts are the same as any 318 til 72. your poly mounts will work on any 318. The poly had a steel crank. not as strong as the 340 steel crank but stronger than the cast 318. the cranks interchange too. tranny bellhousing is the same boltpattern. Hot set-up would be .090 over (sonic check but most are doable to this overbore) and a 4" stroke crank. would come out to 402. (using standard bore 360 pistons). torque-monster !!
theomahamoparguy is offline   Reply With Quote
Old 12-01-2010, 03:29 PM
1970 Dodge Challenger

Paid Advertisement
submit to reddit

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help with 318 poly combination!!! Raider_H8ter Street n Strip 5 01-24-2012 05:15 PM
318 Poly pjmopar General Technical Questions 7 07-31-2011 07:33 AM
Electronic conversion on 66 318 poly belve2 B-Body 6 03-30-2010 04:41 PM
318 Poly pjmopar General Discussion 1 06-30-2009 12:53 PM
318 Poly HELP!!!! ferrell450sel B-Body 1 05-06-2009 10:41 AM

All times are GMT -7. The time now is 02:14 PM.

Advertising - Privacy Statement - Terms of Service - Jobs