Looking over the posts of the blower motor in the dyno and all the discussion about the valley line I had an idea.

I can't remember where I got the idea of the valley line for my motors...maybe the Performance American style in Florida. But I never really thought that the oil might flow back through the other way. It could very well I suppose...when the pressure drops in the system maybe??

At any rate some of these big know builders should let us know some info... :smile:

I did talk to a guy that races stock cars and while talking with him he said his father raced AMCs years ago and they had a bunch of parts. I got his number and called to see if any were for sale (of course not...I later found out)

But one of them said they had a dry sump system 8) and they use the valley line also. But he said it had 4 lines on it of each main bearing. I never say the motor or system, has anyone heard of this?

Don't know if that would be better...UNLESS a person would take it one step further...Now this may sound "out there" but some of these ideas come up after a few too many beers. :razz: 111!!! :razz:

What if a person drilled the mains like in the posts of "Extreme Mains" then drilled all the way to the inside of the valley to locate the main bearing feeds.

Then drill or tap the hole bigger at the top, insert a tube (either thread or epoxy it in place, braze?) that will be feed by a separate line or pipe.

Since the line in the mains now is blocked by the tubes you could use the valley line method to get oil in-between the tubes to oil the lifters.

Of course the tubes would have to oil tight at top also in the valley.

Oil for the new main oil line could be supplied by a separate pump line (Indy cover or another "out port" on MC's new cover he's working on??!) to assure a good unrestricted oil supply.

I know, I know...it's probably possible, but would be ALOT of work and add many spots for failure at joints...but if you tear down every so often it's no big deal to test and check things.

That brings me to this...is it just AMC that have the reputation of spinning mains at high RPM? I haven't spun one yet...but I limit RPM to 6000. To me if you street drive it, at any gear, if you're going 6000RPM or more the cops are going to give you a ticket for something. 8) 8)

On a race motor is different...I suppose some of these guys spin them pretty fast...anyone race at 7500RPM for extended time with a AMC?

I'm going to try for 600hp+ on my next motor for the pulling truck and still "street it" also 111!!! (years away as I slowly upgrade the running gear to handle the 460hp I have now.)

Is big hp without the RPM a problem with spun main on the AMC?

Maybe the oil is alot better now days and spinning the mains was an issue years ago...
Has anyone on here had a spun main?
Do you have some pictures?

I can't recall seeing any resent posts with a spun main bearing and a picture?

I know the cam and dissy gears is fixed. Maybe the spun rear main is also, but we don't believe it ourselves.

I've read that to much oil over a bearing isn't good also.
I also have heard and talked to few Chevy guys that spun mains at high RPM...and they have had high volume and high pressure pumps forever. They have had bronze dissy gears forever also.