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Thread: budget build questions for the advanced tuners 6825 ecm $0d bin

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  1. #1
    Fuel Injected! jim_in_dorris's Avatar
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    budget build questions for the advanced tuners 6825 ecm $0d bin

    Ok, I know I am going to catch a lot of flack for this, but the budget is really tight right now. I have a low milage 283 that I can replace the cam in (the current cam is waaay to large) bolt on my rebuilt 193 heads (I hand lapped the valves) and drop it in my truck for around $200. My questions center around 2 things;

    1. if I am using the 8625 ecm, should I use the 350 knock sensor or will the 305 knock sensor work better?

    2. In the bin, I have changed the displacement to reflect the correct value, and I will be using the 61# 350 injectors (I estimate HP at around 289hp at 5000 rpm) do I need to change anything else in the bin? I know that the fuel and timing will need to be changed to get it right, just need it up and running soon, I can make data logs and change my tables once it is running.

    <edit> I realized my title got the ecm incorrect, it is an 8625 that I have a $0d bin in.
    Last edited by jim_in_dorris; 1 Week Ago at 12:26 AM.
    Square body stepsides forever!!!

  2. #2
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    283 was a nice engine and very fuel efficient although it doesn't produce a ton of torque.

    Knock sensor should match bore diameter as close as possible. A 3.8 / 3800 Buick engine is probably closest at 3.800" bore. If I had to pick a smallblock sensor I would use the 350 version.

    Cranking fueling and acceleration tables are often MS pulse width and are not affected by injector constant. They could be very rich for your engine. Maybe someone who knows this mask better could address that?

  3. #3
    Super Moderator dave w's Avatar
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    The 8625 PCM requires using a 4K resistance Knock Sensor. I agree with 1project2many, a knock sensor with a near identical bore, as long as the knock sensor measures 4K +/- a very small %.

    dave w

  4. #4
    Fuel Injected! jim_in_dorris's Avatar
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    Thanks guys, that's the response I was hoping for. The block has been bored 30 over so the bore is 3.9, half way between the 3.8 and 5.7 bores.
    I think the $0D mask uses injector sizing. I know the fuel will be way off, and I am fairly certain the timing will also need work, but that is okay, it isn't my daily driver.
    Square body stepsides forever!!!

  5. #5
    Fuel Injected! jim_in_dorris's Avatar
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    Any thoughts on using a comp cams 12-230-2 cam. 250/260 adv. duration. 110 lsa. 432/444 lift with 1.5s, 461/474 in 1.6s. Will it be able to run at all on a stock $0D bin?
    Square body stepsides forever!!!

  6. #6
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    Comp's online cam selector doesn't show this cam for an EFI application but I think you'll be ok. It looks fairly mild. It's got less lift and duration than the Speed Pro cam in my '57 although the lobes are a little tighter. 35 deg overlap vs 64 on the Speed Pro.

    Is this something you have already, or is one for sale at a good price?

    Edit: I just started looking at cams for SBC and nearly fell off my chair! $250 for flat tappet cams??? Ouch!!
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