If the pistons are hitting the crankshaft, either you have
1. the wrong pistons (350 pistons are relatively short butit is possible to purchase pistons with the same bore but a longer skirt... in which case they would hit the crank)
or
2. the wrong crankshaft with too much "throw"
The Chevy Aveo 1.6L engine is not classified as a zero clearance engine. Zero clearance engines, also known as interference engines, are designed in such a way that if the timing belt or chain fails, the pistons and valves can collide, leading to significant engine damage. The Aveo's design allows for some clearance between the pistons and valves, reducing the risk of severe damage in the event of a timing failure. However, it's always best to maintain the timing components to prevent any potential issues.
They are basically the same heads, If the 93 350 is a vortex motor.
Timing chain may have broke or jumped and the pistons are hitting open valves.
I wouldn't be so worried about the heads as the pistons. Make sure you have enough clearance so that an open valve won't hit a piston.
no.
307 pistons are 3.875" diameter. 305 pistons are 3.736". It might be possible to bore a 305 large enough to accept the 307 pistons, but the wrist pin location would be .230" off because of the different stroke. In short, no.
Pistons don't have bots. More information is needed.
4
like every other piston
the pistons inside your calipers are sticking
.002" is what I have on a fresh rebuild.
Depending on what the engine was used for, most likely dish top pistons. But flat tops ARE possible.