Timing 472 BBF
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Timing 472 BBF

  1. #1
    Senior Member GottaJet's Avatar
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    Default Timing 472 BBF

    I need to set the timing on a pretty mild 472 BBF Pertronix RTR Billet marine dist.
    I'm hearing 35-38 set at 3k what do you guys recommend?

    Thanks
    Last edited by GottaJet; 10-15-2014 at 08:43 PM.
    Shhh!! Can you hear that?? GJ

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by GottaJet View Post
    I need to set the timing on a pretty mild 472 BBF Pertronix RTR Billet marine dist.
    I'm hearing 35-38 set at 3k what do you guys recommend?

    Thanks
    What compression ratio, what altitude , more info the better ...

  4. #3
    Senior Member GottaJet's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    What compression ratio, what altitude , more info the better ...
    Honestly the guy I got the boat from had no info to give. He has just recently given me the name of the guy who built the motor, so I will be touching base with him soon to see what I can get. He said he thinks it has an RV cam in it and some head porting and valve work. As far as altitude the boat is mostly used on the river (Parker) and here in So. Cal at low altitudes. I guess for now a generic baseline would be helpful.

    Thanks
    Shhh!! Can you hear that?? GJ

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    Senior Member Futs's Avatar
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    I would start at about 32-34. all the fords I have built and worked on don't like a lot of timing.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by GottaJet View Post
    Honestly the guy I got the boat from had no info to give. He has just recently given me the name of the guy who built the motor, so I will be touching base with him soon to see what I can get. He said he thinks it has an RV cam in it and some head porting and valve work. As far as altitude the boat is mostly used on the river (Parker) and here in So. Cal at low altitudes. I guess for now a generic baseline would be helpful.

    Thanks
    Dealing with an unknown (compression and cam) your best to error on the side of caution and time it like Futs suggested for now , is the Petronix a conversion on the OEM Pretolite distributor ? or an actual new unit ?

  8. #6
    Senior Member GottaJet's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Dealing with an unknown (compression and cam) your best to error on the side of caution and time it like Futs suggested for now , is the Petronix a conversion on the OEM Pretolite distributor ? or an actual new unit ?
    Thanks Guys,
    It's an actual new Pertronix Billet Marine unit not a converted Prestolite.
    Last edited by GottaJet; 10-16-2014 at 09:59 AM.
    Shhh!! Can you hear that?? GJ

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    Promoting pollution Smog Pump's Avatar
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    According to RiverRacer, if it has Iron Heads it will run best between 36-38 degrees. Older Iron heads require more advance than the newer Aluminum varieties w/ heart shaped, fast burn chambers. Talk to your builder, but RiverRacer is pretty sure he'll say 36-38 will be best for performance.
    It don't have to be fast to have fun............

  10. #8
    Senior Member GottaJet's Avatar
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    Quote Originally Posted by Smog Pump View Post
    According to RiverRacer, if it has Iron Heads it will run best between 36-38 degrees. Older Iron heads require more advance than the newer Aluminum varieties w/ heart shaped, fast burn chambers. Talk to your builder, but RiverRacer is pretty sure he'll say 36-38 will be best for performance.
    Thanks
    Shhh!! Can you hear that?? GJ

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