Distributor For 400 build
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Joined: Oct 2001
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From: Augusta.GA
Distributor For 400 build
I'm building a 351M as 400 according to recipe described here using an RV cam and such.
I've read quite a few posts about the merits and demerits of performance distributors and such, and am leaning toward a stock Motorcraft Duraspark ll instead of duraspark l or high output stuff.
I can't find my receipt showing choices, but it seems parts people wanted to know whether I had dual or single advance? I've asked this once before and think it's single, but it's been awhile and I need to verify.
I've read quite a few posts about the merits and demerits of performance distributors and such, and am leaning toward a stock Motorcraft Duraspark ll instead of duraspark l or high output stuff.
I can't find my receipt showing choices, but it seems parts people wanted to know whether I had dual or single advance? I've asked this once before and think it's single, but it's been awhile and I need to verify.
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Joined: Sep 2001
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It depends upon whether you use EGR or not. If you don't use EGR then use the advance mechanism for a 1971 400 from a Ford LTD. It is a dual diaphragm if I remember right but see if they have a single unit listed. You use only the main port not the side port on the dual unit. If you do use EGR use the advance mechanism to match your year or the unit for a 78/79 truck 400. You may have to modify the 1971 advance unit arm to make it operate properly.
I will be using the DS-II distributor on my 400. The 400 is not a high RPM engine so you do not need an ignition system designed for 6K+ RPM operation.
Don't use an RV cam. Use a Comp Cam 255DEH or 265DEH but you will get better mileage with the 255.
I will be using the DS-II distributor on my 400. The 400 is not a high RPM engine so you do not need an ignition system designed for 6K+ RPM operation.
Don't use an RV cam. Use a Comp Cam 255DEH or 265DEH but you will get better mileage with the 255.
Last edited by Torque1st; May 30, 2005 at 12:01 PM.
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Joined: Oct 2001
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From: Augusta.GA
Mild Build 400 Distributor
Thanks again.
The CompCam 255 DEH with the "K" kit and matching dual roller timing set is sitting in a box on more computer room floor. I probably went this route from your ealier recommendation, though I thought the 255DEH was an RV cam.
I won't be using EGR, so it's the 1971 400 LTD Duraspark ll. They offer both the single and dual diaphragm. I messed up when I said dual advance.
I don't like the sound of "modify the advance arm", but trust it's in the doable range for a first timer.
The CompCam 255 DEH with the "K" kit and matching dual roller timing set is sitting in a box on more computer room floor. I probably went this route from your ealier recommendation, though I thought the 255DEH was an RV cam.
I won't be using EGR, so it's the 1971 400 LTD Duraspark ll. They offer both the single and dual diaphragm. I messed up when I said dual advance.
I don't like the sound of "modify the advance arm", but trust it's in the doable range for a first timer.
