I have spoken to Toth. He has been very helpful. I have not talked to Gary.
318 Poly A engine in a 67 Cuda
- Thread starter Dmopower
- Start date
-
I bought some header flanges off of eBay and a kit from summit racing with a bunch of pre bent 1 3/4 pipe and collectors.
worked great and was a fun project. The poly went in a truck so plenty of room, but im sure a set for an A body could be accomplished the same way.
The poly is a neat engine but has some drawbacks. It is as wide as a 440, heavy, and aftermarket support is very thin- and if you ever need to change a rocker arm with the engine in the vehicle it is a pain in the ***
The one in my truck runs great. Lots of torque, even below idle speed. We balanced the crankshaft and it is very very smooth.
worked great and was a fun project. The poly went in a truck so plenty of room, but im sure a set for an A body could be accomplished the same way.
The poly is a neat engine but has some drawbacks. It is as wide as a 440, heavy, and aftermarket support is very thin- and if you ever need to change a rocker arm with the engine in the vehicle it is a pain in the ***
The one in my truck runs great. Lots of torque, even below idle speed. We balanced the crankshaft and it is very very smooth.
I saw that kit. I don't know if it will help with my tight fit or not. I would still like to know the distance between a 62 to 66 B body torsion bars and the same on a 67 A body. That would be helpful.
I just went out and measured a 71 scamp at 22 1/2 inches and a 64 dodge330 at 24 1/2
thats not exact, just me laying on the gravel in the dark with 25 ft Stanley and a flashlight in a hurry because on its freaking cold
thats not exact, just me laying on the gravel in the dark with 25 ft Stanley and a flashlight in a hurry because on its freaking cold
Read post number 11 in this thread.
Shoot read the whole thread while you're at it.
www.forabodiesonly.com
Shoot read the whole thread while you're at it.
NAZ.. here are the 318 poly headers i told you about.
@Naz if ya want more pics let me know..
www.forabodiesonly.com
Last edited:
More reading on the subject.
board.moparts.org
Ford sb headers on a 318 poly?
After some research, I've noticed that if full flanged Ford small block headers are finely centered against a 318 poly head, the two inside runners will be too wide by .040" each, forcing the two outside runners to be off by .080". So if a section .080" wide is cut from the ...
board.moparts.org
Motor Trend 2001 318 stroker build.
www.motortrend.com
How To Give A 318 Poly Engine More Power - Mopar Muscle Magazine
Learn how to give a 318 poly engine more power from inside a 1956 Plymouth Savoy. Check out build details along with photos only in Mopar Muscle Magazine
Building a Poly is a cool thing. They can make power. Putting one in a Gen 2 Barracuda is another thing. Each to his own. That's hot rodding.
I think you'd be money ahead and have a better combo by installing a 383 or stroked 400. imo if you want the wow factor of a bigger engine.
Did you say 318 poly in a 67 Barracuda, really. I would have never given it a thought.
Did you say 318 poly in a 67 Barracuda, really. I would have never given it a thought.
earlymopar
Well-Known Member
The headers for the Gen III Hemi (I believe) are all of the "shorty" and aren't all that helpful from a performance standpoint. I adapted Ford 302-351 headers to my Poly in the late 90s by way of a custom adapter I made. The port spacing is pretty close but it's the flange angle and bolt hole differences that you need to get around. I refused to go the TTI route and pay $ 750 (at the time) for mild steel headers. I paid $200 for very good quality stainless headers off of eBay.
Yep those two are poly gurus. You might also go to FaceBook and go to the poly site there. I will bet someone ther can answer any question regarding the poly.
That was very very nice of you to do that for me. Thank you VERY much!! Good information.
Thank you. Great looking engine. I don't have room in my cuda for the exhaust adapters. I'll likely cut the headers at the flange on the correct angle to reweld to poly flanges. That's my thought at the moment.
I have Poly I installed in a 66 valiant, it can be done with a little work. And as far as headers you will have to make a set. And I had a few sets of header flanges CNC made for rectangular and round tube out of stainless if you are interested
Dale Davies
Well-Known Member
The R blocks are heavier yet and 4000$. The Poly heads are 10 pounds heavier each bare and the block is 23 pounds heavier than an La before it's bored to 4". The main webs are more solid not hollowed on one side and you can beef the bottom end up to hold 750 hp safe that the La can't take. If the poly heads wont fit I'll adapt the poly block to an La head and then supercharge it down the road. That's why I don't want to run a 340 or 360. They won't take the power I'm going to run as well. I can live with the extra weight if it will take the power.
Last edited:
Wait again. Put aluminum heads on it then it will weigh less than a LA. And while you're at it keep in mind the head design produces more torque than the LA head.
I knew I would get kick back on the poly. I have 383's 440's ect. I don't want to be everyone else. I love to walk my own path. A stroked poly that's streetable with a torque storm putting it over 750 hp has super cool written all over it.
It appears nobody has. ;)
This one only makes 550 horsepower. But that was 8 years ago. Times have changed make more power.
www.motortrend.com
This 426-Cube 318 Poly Can Outgun Hemis!
A look at the inner workings of a highly modified Chrysler Plymouth 318 Poly small-block V8 with dyno test results.
I seen that article and several others. I think I can be in the 450 to 500 range and be very streetable. Then the Storm would take it over the top. I was going to build a stroked 340 but no matter what I do I'll be at or over the bottom end's limit. I have Milodon 4 bolt caps with splayed outside bolts that everyone says don't use because the block is thin there. Well the poly is NOT thin in that area and the caps are YUGE. Thinking replace the splayed bolts with studs. I also have a girdle but I'm not sure if it can be mated with the Milodon caps or not yet. So I have the option of using one or the other and maybe both! I can have a cam made, play a waiting game on a Windtunnel manifold, ad a flex fuel Killshot EFI and call it a day.
Rat Bastid
Dunamis Metron
You can buy a Ritter block for less than 4k.
Comparing an R block to a poly block is silly.
-
