Go back to home

Oval port conversion to D port

Author
Post
Essentials Only Full Version
NeilR
Enthusiast
  • Total Posts : 77
  • Scores: 0
  • Reward points: 2343
  • Joined: 2015/10/02 21:12:32
  • Status: offline
2019/07/16 21:44:40 (permalink)
0

Oval port conversion to D port

I have a V6 GT and the engine is in need of a rebuild. The car was originally my Uncles car, bought new in 1970. He's not that well and I'd like to get it running well. 
With the engine rebuild I would like to get in the order of 180-190bhp out of it and have heard much of D port heads. What parts are needed for the conversion?
#1


3 Replies Related Threads
    Johnscapris
    Enthusiast
    • Total Posts : 98
    • Scores: 5
    • Reward points: 5609
    • Joined: 2011/08/01 11:02:49
    • Location: Morayfield Qld Australia
    • Status: offline
    Re: Oval port conversion to D port 2019/07/17 07:50:19 (permalink)
    0
    Hi Neil,
     
    Pistons:  11.5 to 1 compression cast will be OK.
    Heads:  D port with 1.75 inlet, 1.5 exhaust with exhaust seats.  A professional port mods.
    Inlet manifold:  D port with port matching and internal port mods.
    Camshaft:  duration of 245 degrees at 0.050 with lift of 0.350 inch.
    Rocker rollers:  1.5 or 1.6 ratio that will provide valve lift of 0.500 inch.
    Valve springs:  Duel 100lb on seat and 250lb open.
    Ignition:  Recurved dissy with electronic ignition.
    Carby:  a 40dfav will achieve the 180 HP you are requiring.
     
    Good luck.
    Regards
    John
     
     
     
     
     
     
    #2
    NeilR
    Enthusiast
    • Total Posts : 77
    • Scores: 0
    • Reward points: 2343
    • Joined: 2015/10/02 21:12:32
    • Status: offline
    Re: Oval port conversion to D port 2019/07/17 17:36:18 (permalink)
    0
    Thanks for the reply John, the CR surprises me - it seems very high for an iron Heron head engine.
    #3

    BEE VEE
    Scholar
    • Total Posts : 1020
    • Scores: 17
    • Reward points: 3952
    • Joined: 2014/01/02 15:53:02
    • Location: MORNINGTON PENINSULA, melbourne
    • Status: offline
    Re: Oval port conversion to D port 2020/08/19 11:51:42 (permalink)
    0
    NeilR
    I have a V6 GT and the engine is in need of a rebuild. The car was originally my Uncles car, bought new in 1970. He's not that well and I'd like to get it running well. 
    With the engine rebuild I would like to get in the order of 180-190bhp out of it and have heard much of D port heads. What parts are needed for the conversion?


    Hi Neil,
    can you recall how many kms the donk had done before req re-build ?
    How did your fresh re-build go, and did you follow Johns great advice to the letter ?
    cheers

    "GOOD BETTER BEST: NEVER LET IT REST: UNTIL YOUR GOOD IS BETTER, AND YOUR BETTER, BEST"
    ( Furphy WW1 HORSE-DRAWN water-tank end-plates)
    #4
    Jump to:
    © 2025 APG vNext Trial Version 5.1