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Old 05-16-2011, 10:22 AM
AA eron AA eron is offline
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Default cylinder head numbers/interchangeability?

Hey guys, I'm new here, I put up an intro post in the intro section.

I'm in the middle of a cylinder head swap on a 2001 3.0 gas engine (not flex fuel) and I've got a question about the heads. Mine are cast F6DE, 19 on one head and 20 on the other. Do I need these exact heads or are there others that will swap? I have a friend that works at a large chain auto parts store and can get me a great deal on remanned 3.0 heads that are supposedly for a 2001 Ranger, but their website lists the part number as F6DA. Anyone know if these heads will work?
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Old 05-16-2011, 10:47 AM
01B3000 01B3000 is offline
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Default Re: cylinder head numbers/interchangeability?

I'm unsure about the part numbers, r the changability optiions, but that part number may be for the flex fuel model.
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Old 05-16-2011, 11:04 AM
AA eron AA eron is offline
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Default Re: cylinder head numbers/interchangeability?

well, according to the casting number on my heads, F6DE-GC, they are not flex fuel. The flex fuel heads used the suffix EB instead of GC. I guess what I need to know is has anyone heard of, or seen the casting number F6DA? I guess it's possible that it's a misprint on the website...
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Old 05-18-2011, 05:44 AM
AA eron AA eron is offline
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Default Re: cylinder head numbers/interchangeability?

So I found the correct heads that I needed and picked them up. Now I have another question. The heads I got are freshly remanned. To be on the safe side, I checked the assembled valve spring height according to the manual. The spec given is 1.650" - 1.736". All my valve springs are under spec, with no shims, the farthest one out of spec by .080". Do you guys think I should be worried? I understand that the important thing is valve tip to rocker clearance, or lash, and since there is no adjustment I'm worried that the lash will be too great. I plan on assembling the heads and valve train and checking the lash, just wondering If I should be concerned about the valve spring height.
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Old 05-18-2011, 03:41 PM
AA eron AA eron is offline
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Default Re: cylinder head numbers/interchangeability?

so it looks like i've got heads that are set up with the 86-94 valve spring height of 1.58". I don't know if this will be acceptable or not. If the change to 1.65 was achieved by cutting the valve seat deeper, I think I'll be okay. My worry is that if the change to 1.65 was achieved with a higher spring seat, then I might end up stacking the springs at max lift. My plan is this: I know cam lift is .260" and the rocker arm ratio is 1.61:1. That means max valve lift is about .419". I'll start at the valve with the smallest assembled seat height 1.570", subtract .419" for a value of 1.151". I'll compress the spring on the head and measure from the spring seat to the top of the spring and if it's less than 1.151" I should be okay. My only concern is why the change to 1.65"? My only guess is that the roller tappets (starting in 95) weren't happy with the higher spring compression of the earlier spring height? I have roller tappets...

I'm probably waaaay overthinking this and I'd be better off to just bolt the damn things on and go. whatever.

Last edited by AA eron; 05-18-2011 at 03:57 PM.
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Old 05-18-2011, 03:58 PM
AA eron AA eron is offline
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Default Re: cylinder head numbers/interchangeability?

and the verdict is in- spring compressed height is 1.150". Hmmmmm....that's pretty tight....
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