200x. Bent valve (a brand new one dohhh)

[tri again]

went and picked one up today guy had new rebuilt motor on it i got it out road it lost compression leaks wear top and bottom gasket go has low compression but wont start what do i do

hi and welcome

there are manuals in the 'world class help' section for free altho they don't always address real world issues.

You can try the search key too.
or start a new thread specific to your particular problem.

For THIS thread, I'd have to agree with the chain theory.
if they stretch, you'd think the valves would open later, but if they're set real close (opening at) to tdc they may kiss if the connecting rod expands when it gets warm.
Sloppy valve guides may let them rock or tip just enough to hit the piston depending on the clearance to start with.
The drive side of the chain, if stretched, seems like it would cause the valves to open later when the piston is already on the way down but backside slop, aka tensioner side, may allow the chain to jump a tooth on either the cam or crank sprocket..

What was the ol' chevy trick?
just put on old timing chain one tooth back to compensate for the wear and stretch.??

Valve keeper let go?
weak valve spring let the keeper fly out?
"cheap' valves can stretch over time and change the clearance between the valve and piston.
but that usually takes lots of heat and time and abusive overrevving.

Whatever it is, I hope it's an easy fix.

Just make sure you polish the 'dent' on top of the piston so it doesn't glow and cause pre ignition pinging.