What do you have for push rods?

 

BTR chromoly push rods

 

Not enough spring load? Cam too aggressive?

 

Too much spring is better than not enough.....And are the springs set up right?

I broke some parts over the years and when I went higher on spring pressure than anyone recommended, the parts breakage stopped.

 

Sounds like coil bind possibly.

 

Or too far away from coil bind. A lot of people who do not build engines look at tighter coil bind specs as bad. When it's exactly the opposite.

So a few years back I had a friend busting up valvetrain parts. I asked him how close to coil bind he was running the springs.

He said " oh it's not that, I have a ton of coil bind clearance......"

I said, "that's not how that works......"

 

That's really not a lot of spring pressure to cause damage and you must check piston to valve clearance on the overlap stroke. Install a soft checking spring and rotate the engine while checking. Sounds like the valves are hitting the piston.

 

Check exhaust PVC at 10 degrees before TDC. Check intake PVC at 10 degrees after TDC

 

Or set up as others have said.

 

ya or that

 

Can you buy an on head spring checker. You can check all the seat pressures.

 

finally got the motor out and pulled the intake it broke the head of the intake valve off and it got over to the other side of the fucking motor some how so yea its probably fucked up pretty good

 

Oh man that sucks.

 

So it was the springs one spring the whole that got destroyed the intake spring was completely dead

 

LSM makes a great on head spring tester. Every winter and sometimes mid season we record every seat pressure and the exact valve lash. Its taken some time and money but our BBC valve train is very stable at 7500. years ago we had a flat tappet valve train that we changed the springs every winter because of the aggressive profile and it wouldn't rev higher than 6800.

Good luck with your rebuild.

 

yep thats something ill be doing from now on I saw in the logs what looked like valve float but i thought it was the trans or converter or something else since the springs were brand new on a hydraulic setup with lower spring pressure no less but next time i wont over look anything giving it the benefit of the doubt cost me.
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My motor guy is doing right by it though hes gonna take care of it and fix everything now my only concern is will sleeving cyl 7 weaken the block or not cause ive seen mixed shit on whether you should sleeve an iron block