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Thread: Porting question on exhaust bowl - pic attached

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  1. #1
    Join Date
    Apr 2002
    Westminster, CO

    Porting question on exhaust bowl - pic attached

    I disassembled a spare head today and was thinking of trying my hand in lightly porting a set.

    The intake valve seat looks to be pretty well blended into the intake bowl in stock form.

    The exhaust valve seat, not so much.. Is this a casting flaw of this particular head, or is this pretty typical? (see picture - seems the exhaust valve seat is smaller than the bowl.)

    Obviously I can't just take the dremel/porting bit to the valve seat.

    Is this something that a machine shop can taper in when doing a performance multi angle valve job? or is the only way to correct this by going with larger valves and seats?

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    1994 Thunderbird SC Auto #2 - 45k original miles.
    1994 Thunderbird SC Auto #1 - Police package heads/96 N/A motor test mule. SOLD
    1992 Thunderbird SC 5 speed. Mostly stock now, former 345.5 rwhp/402.8 rwtq monster. - SOLD after 12 years of ownership
    2000 Grand Prix GTP -Turbo conversion, billet precision 5858 CEA turbo .63 T3 hotside. Stock supercharged longblock with N/A top end, numbers coming soon.

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