504 and 604 unleaded valve seats
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  1. #1
    Simon's Avatar
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    504 and 604 unleaded valve seats

    Let's see if we can finalise once and for all the discussion about valve seats and their suitability for unleaded.

    These details are for USA market cars.

    Exhaust valve seat P/N 0227.16 to suit XN1 and XNA up to 2.570.000.

    Exhaust valve seat from 2.570.001 P/N 0227.43 (1st repair oversize)

    From vehicle 2.570.000, the US cars were fitted with a catalytic converter for unleaded fuel, therefore the change in valve seats can be considered to be hardened.

    As a comparison, the exhaust valve seat for all Euro (and AUS) market cars (at least until 1983) was P/N 0227.16.

    Therefore it can be summised that the exhaust valve seats of a 504 head are not suited for unleaded fuel, probably one of those things to get done when the head is off the car.

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    Now for 604.

    Exhaust valve seat P/N is 0227.35 (1st oversize) for all 604's carb and injection USA, Euro and AUS(at least until 1983). From this it could be summised that the seats are hardened.
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  2. #2
    Budding Architect ???? pugrambo's Avatar
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    Simon:
    Let's see if we can finalise once and for all the discussion about valve seats and their suitability for unleaded.

    Now for 604.

    Exhaust valve seat P/N is 0227.35 (1st oversize) for all 604's carb and injection USA, Euro and AUS(at least until 1983). From this it could be summised that the seats are hardened.
    valve seats in 604's are all hardened and as such will run on unleaded fuel without damage
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  3. #3
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    Further to that Australian 505s had hardened (exhaust) seats from early 1982 and all were superseded by yet another part number later in the 80s (hardened).This information was taken from an official micro film.
    Graham Wallis

  4. #4
    Gone Fishin' Ray Bell's Avatar
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    Graham...

    Did you not post a little while back that as far as you knew all heads with the sandwich plate and paraphenalia with the hose clamps had hard valve seats?

  5. #5
    Guru davemcbean's Avatar
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    I just had my friends 504 head converted to hardened exhaust seats and stainless steel exhaust valves.

    Cost:
    -$120 for the seat inserts
    -$80 for the valves

    Dave
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  6. #6
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    Ray,
    That ties in with the early 1982 date I mentioned.
    Graham

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