View Full Version : CNC Ported 318 Poly Heads

11-01-2013, 01:30 PM
I am working with a race engine builder on a 394 stroker poly. We spent some serious time (and money) porting the head till we felt we came up with good flow #'s without getting too aggressive. Then the ports were digitized and programed into the CNC machine and heads ported from that program. With the CNC porting all ports come out the same. We needed to sleeve the pushrods which came out very nice. We hit 1 water jacket but it was a intake port so it was patched up. We ran 3 different head flows. 11/32 and 5/16 valves on the hand ports then digitized these ports.CNC then done for these final #'s, 5/16 with some additional valve work. Here are the flow #'s all 28" with 1.94"' intake and 1.625 exhaust.http://www.forbbodiesonly.com/moparforum/images/smilies/headbang.gif

11/32 int/exh
.10 75/63
.20 158/105
.30 218/130
.40 241/171
.50 250/192
.55 256/198
.60 260/201
.65 264/205

5/16 int/exh
.10 79/67
.20 162/109
.30 222/134
.40 245/175
.50 254/196
.55 260/202
.60 264/205
.65 268/209

5/16 with valve work int/exh
.10 72/67
.20 141/104
.30 211/133
.40 248/175
.50 263/198
.60 266/211
.70 271/217

Over the next month we will start to work up pricing and package for those interested. Feel free to ask any questions.


11-01-2013, 01:32 PM
2 more pics

11-01-2013, 07:17 PM
Great work !

11-01-2013, 07:51 PM
What a coincidence, My friend is building a Henry J Gasser, was originally planning a Gen III Hemi but is seriously considering a Poly, How do your flow numbers compare to stock ports? (flow#'s and % increase) Looking at those flow numbers it looks like the heads would benefit greatly from forced induction. Once your CNC program is finalized will you be able to guarantee you won't get into a water jacket if we were to have a set done?

11-01-2013, 11:33 PM
Very nice work. Wish I thought of having my 452 ( I think) heads cnc ported.

11-04-2013, 09:09 AM
stock flow:
.100" 50/45
.200 116/83
.300 149/106

.400 171/126
.500 183/159
.600 n/a

CNC is finalized and pics and flow #'s that say 5/16 with valve work are after CNC. The pics show that I did get into a water jacket. It was an intake port so it is fine to patch it. It was about a pea sized hole. Patch is shown on the extra 2 pics I added. Because of core shift all heads are a little different so cant guarantee not hitting the water jackets but the are the highest flowing poly heads so risk equals reward!

12-07-2013, 02:47 PM
Here is the pricing for the CNC Ported poly heads. Also some pics of the crossover fill.
Using Clients Poly Heads
Price $2,800.00

CNC Stage 1 for one pair Bare
Hard exhaust seats
Performance Valve job
Machine, Install new 5/16" Bronze guides
Hone Valve Guides to spec's
Flat Mill Heads up to .010"
Open / Cut Spring Pockets
Open Pushrods holes and install bronze sleeves
Crossovers filled with 2000 dg F material
Pressure checked heads after work is done

Any unforseen issues are at an extra charge.

Flow Numbers 28" OF WATER
.100" .200" .300" .400" .500" .550" .600" .650"
Intake 1.94"

79 162 222 245 254 260 264 268
Exhaust 1.625"

67 109 134 175 196 202 205 209

Customers heads that have not been crack tested are subject to a release of all demands signed document before any work can be done.

These heads with proper assembly & a good intake manifold flow with a calculated componet configuration can produce over 500 HP

12-21-2013, 09:37 AM
Good read on page 34 of Chrysler Power mag about my engine builder.

02-06-2014, 10:53 AM
Molds for the custom pistons are done.

02-06-2014, 02:20 PM
Is Pavlovich you engine guy?

02-07-2014, 07:48 AM
No Gary P. is not my engine guy but I do speak to him alot. He is buying a set of these heads for one of his next builds. My engine guy is Gregg who owns Hekimian Racing Engines.

Is Pavlovich you engine guy?

02-07-2014, 05:09 PM
I wonder if he will be using the new POLY manifold Chrysler Power is doing, I know he was in on the development of it.

02-10-2014, 07:51 AM
I believe he ordered 2 of those manifolds. I will also be using one one my build. Only a couple of days left to get one ordered at the discount price.

I wonder if he will be using the new POLY manifold Chrysler Power is doing, I know he was in on the development of it.

07-08-2014, 10:38 AM
New custom lightweight poly pistons

07-08-2014, 10:42 AM
WOW BLING BLING!! those look fantastic

you have been busy I see

07-08-2014, 01:21 PM
Those are some nice looking parts - are you going to dyno this engine? I'd love to see the numbers.

07-08-2014, 01:50 PM
Thanks, yes I will post up dyno numbers when its run.

Those are some nice looking parts - are you going to dyno this engine? I'd love to see the numbers.

11-26-2014, 07:35 AM
T&D rollers and the stands cut for mounting.

04-13-2015, 08:48 AM
some grinding on the block and heads and custom offset on the lifters and the 1.6 ratio fit.

09-02-2015, 10:55 AM

01-08-2016, 01:00 PM
friction and thermal coating done.
heads assembled.

01-08-2016, 02:35 PM
Wow! You´re doing some nice work to those old Poly-Heads!

01-11-2016, 12:06 PM
I remember back on the farm we had a 57 Dodge D500 grain truck with a Poly engine and the funny thing is it had a 4 barrel carb on it... It had just as much torque under load as our newer Ford grain Truck with a 534 gas engine.

when the truck was worn out beyond repair the engine was pulled and put into our portable sawmill and worked for another couple decades.

I wonder if the 4brl poly heads were better than the 318 "car" 2 barrel units ?

01-22-2016, 03:54 PM
some assy pics.

01-22-2016, 04:34 PM
Why does the cam sprocket have offset holes?

What oil pan are you going to use?

01-25-2016, 07:28 AM
Not really sure about the cam sprocket holes. Every one I have seen seems to have a different design. Going to be running the milodon pan #31590.

03-09-2016, 01:34 PM
longblock done.

03-09-2016, 04:46 PM
Damn....:-) 66 Coronet500

I also have the 318 poly in my car - but the head doesn't look like yours.....;-)

Enjoying your pictures of the build.

Looking forward to see the result of all your fine work.


11-23-2016, 10:03 AM
Almost there


11-23-2016, 11:04 AM
Hot Damn that looks sweet

11-23-2016, 11:35 AM
Awesome, if it runs half as good as it looks you are a success.

11-24-2016, 08:51 AM
That looks really good! I love the color combo.

12-12-2016, 11:04 AM
Looks like a badd ass motor, when are you going to dyno it?

01-12-2017, 08:25 AM
Sometime this winter. Fitting pulleys and making bracket for vacuum pump now.

02-12-2017, 01:34 PM
I saw an article in mopar muscle about a 550 hp poly with a ls intake, didnt have time to read it, i might actually buy that copy to have.

02-14-2017, 10:04 AM

Getting closer!

02-14-2017, 02:26 PM
Can I go for a ride? Or even be there to watch it run would be sweet.

02-15-2017, 08:29 AM
you mean 605hp:

I saw an article in mopar muscle about a 550 hp poly with a ls intake, didnt have time to read it, i might actually buy that copy to have.