Foxy Green Foxbody Build

1slow62 said:
Have you ran it with the valve covers off?
Click to expand...

I have a set of valve covers with the top cut off but no one has gaskets in stock locally.

I've been advised to put that on, start the car. And using a few towels wrapped around a finger to put pressure on the back of the rocker and see if any of them quiet down with pressure
 
I'm at 1/2 past zero lash. That was the instructions with the lifters. I went back in my notes and verified that's where I set them the first time and did so again.

I can try 3/4 past zero but I'd like to change the oil as well. Trying to see if any of my neighbors or friends have equipment I can use
 
screw driver stethoscope to valve cover to hear which one? not just an exhaust leak?
 
When you get it home, before you restart engine, pull the rockers you noted as being the loudest, check pushrod ends for wear and pushrod cup in the rocker for wear, and rocker fulcrum bearing for wear, ie., looser clearances than new out of package.
I think I remember you having issues with guide plates and studs?
Look that over also.
Hope for the best, you have been on a very steep learning curve.
 
As far as idle mixture goes, you may want to use a smaller idle fuel restrictor or larger idle air bleed.
With a cleaner idle burn, you will better determine the best base timing for "your" engine.
 
No valve cover gaskets around town. Oil changed. Definitely smelled like fuel. Disconnected alternator just to make sure it wasn't something weird. Fired it up. Sound is still there. I have to find a gasket and check while watching it
 
Why do you need another gasket? I’ve reused valve cover gaskets 100 times. You didn’t silicone them did you? The blue rubber gaskets have always worked great for me.
 
I had stethoscope on it. Header, intake, valve cover, nothing seemed louder than the other, nothing stood out.
 
Patriot Racer said:
Why do you need another gasket? I’ve reused valve cover gaskets 100 times. You didn’t silicone them did you? The blue rubber gaskets have always worked great for me.
Click to expand...

The valve covers I have vs these other ones I cut up are oddly shaped and I don't want to go fuckin up my good ones. I'm pretty sure Napa will have a gasket at their warehouse. Tomorrow is a new day. My brain hurts
 
89 Fox 427 said:
The valve covers I have vs these other ones I cut up are oddly shaped and I don't want to go fuckin up my good ones. I'm pretty sure Napa will have a gasket at their warehouse. Tomorrow is a new day. My brain hurts
Click to expand...
I say that all the time!

Keep at it, you're learning and it will work out for ya.
 
89 Fox 427 said:
My thought is that with as much air this cam pisses out the exhaust at idle the a/f should show leaner than that. The internet guys also mention a leaner idle helps the car start when hot because the fuel vaporizes instantly and contains more fuel vapors.
Click to expand...

The issue as I understand it, is with a decent amount of overlap there's not enough scavenging to clear the cylinders out on the exhaust stroke (at idle) so you have cylinders partially filled with dead air. The slightly richer mix will give it a better opportunity to light off. At 14.7 there's a chance you'll end up with a lean miss.

Try it for yourself, I suspect the "internet guys" either don't have much overlap or they're running EFI. Although I guess the ironic thing is I'm also an "internet guy" as far as you're concerned.
 
hq308 said:
The issue as I understand it, is with a decent amount of overlap there's not enough scavenging to clear the cylinders out on the exhaust stroke (at idle) so you have cylinders partially filled with dead air. The slightly richer mix will give it a better opportunity to light off. At 14.7 there's a chance you'll end up with a lean miss.

Try it for yourself, I suspect the "internet guys" either don't have much overlap or they're running EFI. Although I guess the ironic thing is I'm also an "internet guy" as far as you're concerned.
Click to expand...

By internet guys I meant one youtube warrior and he sounded smart and showed back to back tests. You're probably correct and I need to understand every engine is different, and all these little things add up and make variances.

I'm excited to get to tuning on this thing and work out the kinks.
 
@Badd_Dadd I think you're right about the air bleeds. Another thing I discovered is that it has idle speed adjustment screw on both the primary side and secondary side. I had the primary backed all the way out, it was idling only off the secondary. I have some work to do to even those out. Here's a pic of the current carburetor specs. Power valve seems correct based on my vacuum readings at idle. I don't know squat about anything else without testing on the road. Throttle is snappy as hell though with no stumble.

20251029_091349.jpg
 
You must log in or register to reply here.
Back
Top