Join Shelby Forums Today

Best Valve Size For Power/Durability

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by SLCK64, Jan 13, 2008.

  1. Jan 13, 2008 #1
    SLCK64

    SLCK64 New Member

    Posts:
    2
    Likes Received:
    0
    Joined:
    Jan 13, 2008
    Location:
    IL
    I am building a 68 302 for my 64 Merc Comet and was wanting to step up intake and exhaust valve sizes and was wondering..... What i the biggest valve I can go and not have to worry about head damage of some sort. I wanna put a pretty decent sized cam in it and I am looking to go to the strip maybe a few times a month but mostly make it a daily driver for the good months of N. IL weather, so I dont wanna push the limits of catastrophic failure after a couple of years. Or should I just get a good 3-angle valve job(best angles?) and leave them stock size? Thanks for your help!
     
    SLCK64, Jan 13, 2008
    SLCK64, Jan 13, 2008
    #1
  2. Jan 13, 2008 #2
    dc-dd

    dc-dd Well-Known Member

    Posts:
    117
    Likes Received:
    1
    Joined:
    Feb 15, 2007
    Location:
    PA
    Are you using stock heads ??? If so think again get your self a set of new heads there are many makes that are fairly priced and you do not have to go aluminum if your on a tight budget. They will be a better product and you will gain more horespower.

    Dominic
     
    dc-dd, Jan 13, 2008
    dc-dd, Jan 13, 2008
    #2
  3. Jan 13, 2008 #3
    roddster

    roddster Well-Known Member

    Age:
    72
    Posts:
    825
    Likes Received:
    3
    Joined:
    Dec 27, 2004
    Location:
    Lansing, the one in Illinois
    For instance. The late (not sure of the year) Explorer seems to have iron GT 40 heads. And you could probably find them in a U-pick yard.
    Unless it is positively necessary to reuse the original heads, you might want to look further in that.:thumbup:

    By the way, I see you say you live in Northern Illinois. Look us up on the VMF. www.Vintage-Mustang.com The "we" I mean is the Chicago V-M guys. Yeah, no charge, just a look conglomerate of Mustang owners from the Chicago area. And, you can probably get you headwork/modification questions answered there too.:cigar:
     
    Last edited: Jan 13, 2008
    roddster, Jan 13, 2008
    roddster, Jan 13, 2008
    #3

Share This Page