Results 1 to 10 of 38

Thread: CNC Ported 318 Poly Heads

Threaded View

  1. #1
    Member 66coronet500's Avatar
    Join Date
    Jan 2013
    Location
    Hopkinton, MA
    Posts
    31

    CNC Ported 318 Poly Heads

    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.

    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
    Attached Images Attached Images

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •