V10 swap or 460?

[85_Ranger4x4]

Had no idea these were a thing, neat!

Lexus GX is basically a 4Runner with a different front end, a V8 and a bunch of luxury crap...

 

[fastpakr]

Are you sure the GX isn’t a larger platform? I thought the 4Runner shared with the Land Cruiser prado.

And now I’m wandering off down a rabbit hole…

 

[85_Ranger4x4]

Are you sure the GX isn’t a larger platform? I thought the 4Runner shared with the Land Cruiser prado.

And now I’m wandering off down a rabbit hole…

GX is also Prado based.

Lexus GX - Wikipedia

en.wikipedia.org

 

[fastpakr]

You posted before I made it back to admit the error of my ways.

 

[19Walt93]

Maybe because Ford denied there was a problem. Dad’s 89 that he bought brand new had a problem from day 1 and Ford refused to do anything about it for 30k, then quietly fixed the truck. 80k later it was back to the same problem. The 94 made it about 100k before it became an issue. Despite 3k mile oil changes. I should make a video on how bad these guides are, the valves rattle around and you almost can’t pump air in the cylinder fast enough to hold the valve up to check it without pulling the head.

I’ve talked to a number of other people that have had 460’s with an oil consumption problem that is typically the valve guides

If a customer had a complaint we tried to fix the problem, Ford didn't try to tell us to ignore anything. Most TSB's originate in information from the dealers.

 

[19Walt93]

I have heard stories of guys being told a quart every 5-800mi was "normal" by the dealer on a 460.

Both of mine burned it. My 97 ate about a quart every 1500mi which i thought was pretty average...the 89 (79 motor) drank over a qt every 1000mi. Never looked into the cause though

Those guys need a new dealer, the normal spec used to be a quart in 1500 and we saw darn few complaints after the 80's- except for customers who used Amsoil, Amalie, or Castrol.

 

[19Walt93]

This. Ford insisted that a quart of oil consumed every 500 miles was “normal” and even when it got to a quart every 100 miles it was still “within spec”…

There’s nothing normal or within spec about that level of oil consumption. Especially when the valve guides have more slop than… well, use your imagination. My suspicion is that they had a stockpile of soft valve guides from the leaded gas era and just used them up rather than getting harder valve guides.

Until engines got aluminum heads the guides were integral to the head, not pressed in and replaceable. Ford didn't have a pile of "soft guides".

 

[19Walt93]

I read somewhere a while ago that one problem with the V10's was that dealers ordered them with 3.73 gears thinking they'd get better mpg when the truth was that they need to spin a bit for best efficiency and did better with 4.10's.

You are exactly right, the 6.8's torque peak was higher than 5.4's.

 

[19Walt93]

When the 4.6 came out there were 2 versions, the Romeo engine had 6 flywheel bolts and full length spark plug threads, the Windsor engine was considered heavy duty, had 8 flywheel bolts but only got short spark plug threads. Crown Vic's- and I think Mustangs- only got Romeo engines. The 5.4 and 6.8 were Windsor based engines. Over torque the plugs like they had iron heads and you're headed for trouble.
The zip-them-out-with-an-air ratchet guys would break plugs in 3 valve engines. My crew figured out quickly that warming the engine allowed the plugs to be removed without breaking them so we didn't have problems with those, either.

 

[lil_Blue_Ford]

If a customer had a complaint we tried to fix the problem, Ford didn't try to tell us to ignore anything. Most TSB's originate in information from the dealers.

Maybe you got better engines or a better dealership network or something. I don’t know, I can only speak to the experience I’ve had and I’ve never had a great experience at a local dealership. These dealerships around here make you want to burn your car in front of the showroom.

Those guys need a new dealer, the normal spec used to be a quart in 1500 and we saw darn few complaints after the 80's- except for customers who used Amsoil, Amalie, or Castrol.

We didn’t use any of those oils… and the local dealerships would leave the 1 off of that number in telling you what was acceptable.

Until engines got aluminum heads the guides were integral to the head, not pressed in and replaceable. Ford didn't have a pile of "soft guides".

I’m going by what I was told, I haven’t personally worked on these heads yet. I had two machine shops insist they were pressed in guides that were too soft. Maybe they are wrong, maybe I misunderstood something, but that’s what I was told by people who I figured should know if they’re rebuilding engines. I haven’t rebuilt an engine yet because I haven’t had a place to do it, so all of my limited knowledge is secondhand or third hand

 

[85_Ranger4x4]

I’m going by what I was told, I haven’t personally worked on these heads yet. I had two machine shops insist they were pressed in guides that were too soft. Maybe they are wrong, maybe I misunderstood something, but that’s what I was told by people who I figured should know if they’re rebuilding engines. I haven’t rebuilt an engine yet because I haven’t had a place to do it, so all of my limited knowledge is secondhand or third hand

My 302 was non-replaceable, if they were I would have.

My old tractors are replaceable and it is awesome to be able to just pop in new ones.