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Author Topic:   stock jetting
Donnie Ross
posted May 06, 2004 08:02 PM
holley 80776 600 dbl pmp jets are 67 w/power valve frt, 73 no valve rear safe starting point on 13 to 1 406?

posted May 07, 2004 07:29 AM
70,78 for a "safe" starting spot. There is a lot of variation depending on your air temp/quality....Those sizes will put you on the "fat" side, but it's better to be there to start with, than too lean.
It's that compression ratio and engine size (as well as probably the cam duration I'll assume is being used) that will cause you to need more than the stock jet sizes.

As always, your best bet is to watch temps and plug colors, and tune from there.

Hope that helps,

posted May 07, 2004 11:34 AM
that sounds good I've been running a 650 dp with 70s and 80s in a 347 ci motor 12 to 1.seems like you might need alittle more carb for that 406.

posted May 07, 2004 01:41 PM
i was thinkin' the same thing.....i run an 830 annular discharge on my 351w.....big cfm for top end and annular discharge boosters for throttle response...

Donnie Ross
posted May 07, 2004 02:18 PM
thanks for the help guys bigger carb is on its way still trying to figure how to hook it up in a streetstock with 8 inch tires, kp cam is .537I .557 E dur. around 260 at .050 if remembering correctly am at work so don have em with me.#3claimer from speedway

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