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CNC Ported 318 Poly Heads

66coronet500

66coronet500

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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.:headbang:

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.

Scott

Head1.jpg comb_intake1.jpg comb_intake2.jpg exhaust1.jpg Head_exh1.jpg Head_int1.jpg intake1.jpg pushrodsleeve1.jpg water_jacket_patch1.jpg water_jacket_patch2.jpg
 
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Nice work! I had mine ported by a race shop as well but the motor has been together so long with the car not ready I don't know all the numbers. Mine is bored .060 over with a 4" Eagle stroker crank.
 
Here is the pricing for the CNC ported poly heads. Also some pics of the crossover fill.Crossoverfill1.jpgCrossoverfill2.jpgCrossoverfill3.jpgCrossoverfill4.jpgCrossoverfill5.jpg

617-926-0608
[email protected]

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
 
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Yup, pretty good lookin! Ever seen a set of heads that had the exhaust guide that was flush with the roof of the port?
 
Molds done for custom pistons.
 

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Love the idea for a stroker build but $2800 in a tough step to take for steel heads then all the parts to complete them. Nice flow numbers though. Are any of the poly strokers pushing 500hp? Ive seen 400hp talked about.
 
Yes it is alot of money for the heads but it cost me about 3 times that for the development and my set to get done. But when you look at guys spending $800 for headers and $600+ for a intake.... I know alot will not get sold (did not do it to make money selling these) but I was doing mine so I figured why not make them available for everyone. Also if you look at the flow #'s these are passing stock flow at 3" and I am excited about how well they are going to perform. Should be hearing back from the piston company over the next week or so. There will be some info on pistons since they are digitizing the mold we sent. Should be able to make pistons for all if people are interested. Just about everything is being custom done on this build so I am very confident that we will surpass the 500 Hp mark. I have not seen any that have done that yet.
 
66coronet500 said:
Yes it is alot of money for the heads but it cost me about 3 times that for the development and my set to get done. But when you look at guys spending $800 for headers and $600+ for a intake.... I know alot will not get sold (did not do it to make money selling these) but I was doing mine so I figured why not make them available for everyone. Also if you look at the flow #'s these are passing stock flow at 3" and I am excited about how well they are going to perform. Should be hearing back from the piston company over the next week or so. There will be some info on pistons since they are digitizing the mold we sent. Should be able to make pistons for all if people are interested. Just about everything is being custom done on this build so I am very confident that we will surpass the 500 Hp mark. I have not seen any that have done that yet.
Click to expand...

I appreciate all your doing. A lot of people will benefit from your work. You are Right about headers and intake. I have the TTI poly headers and a dual quad with Edelbrock 500's in addition to the blue printed rockers from Gary P. so there is a lot of money right there. I really want to stroke it which was my original plan but never did it. let us know on pistons. Thanks!!!
 
Those rockers are nice! Everything you've done looks top notch. Looking forward to the dyno results.
 
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