The saga of my Hemi has ended

[John Lang]

Being a former Hemi Racer,(still have it) I have been taught that with alot of valve spring pressure you should make sure that you run a RADIAL single groove valve lock, as the square cut grooves tend to act like a guiolotine and clip the valve off, but leaving the valve locks in the retainer with the valve stem intact ! Excuse the spelling as i don't know how to spell Gilotine very well ! I learned about the Radial groove valve locks after # 8 Intake valve decieded drop through the top of the Piston ! Shazam,......That's what I was told !..........John

[Tom P]

Bummer about the Hemi Phil, hope it can be pieced together. Our hero Dave was at the oldies drags and i wondered where you were.

[Philip Saran]

Originally Posted by Phillip marvetz

Paul, There have been alot of days that I wish I had kept my 64 Plymouth and done Max Wedge instead,lol

Phillip, that's the problem with hindsight, we figure all that stuff out after the fact.
There are alot of days I wish I had never started on this BB Duster and just kept
my 1969 340-S Barracuda FB (had that car for something like 12 yrs).

[Phillip marvetz]

Originally Posted by John Lang

Being a former Hemi Racer,(still have it) I have been taught that with alot of valve spring pressure you should make sure that you run a RADIAL single groove valve lock, as the square cut grooves tend to act like a guiolotine and clip the valve off, but leaving the valve locks in the retainer with the valve stem intact ! Excuse the spelling as i don't know how to spell Gilotine very well ! I learned about the Radial groove valve locks after # 8 Intake valve decieded drop through the top of the Piston ! Shazam,......That's what I was told !..........John

That's pretty much what looks like happened. The square groove in the lock was gone, All the locks on the intake valve show signs of wear while the exhaust locks look brand new ( because they are lol). The fellow that did the heads say's he thinks it was valve float that beat the locks up. This thing had maybe 20 minutes of run time total. I was thinking maybe the locks were not hardened properly but I would think the exhaust locks would be beat also if that was the case.
Thanks for the advice about the radial groove, I'll keep that in mind when ordering up the new parts. Anyone have a single Mopar aluminum head they want to sell?lol

[jmcarter]

Sorry to hear about the failure Phil, and I'm still with you on what the source of the problem was that started you having to salvage a "professional" built engine. Keep tearing them up with the bracket car in the meantime. Thought visiting Don Little's pit space this coming weekend would be recommended but see he's not on entry list, geez, only 21 Super Stockers at Seattle.

[Phillip marvetz]

Don is on the top of my list for help. I spoke with him on the phone last year and he got me moving in the right direction on fixing a few other issues. I'm still thinking about that 318 also, Just might take a little longer now.

[Terry Bride]

Hey Phillip,

This catastrophic hemi story has given me a little deja vu!
We installed a 517 that the customer supplied into a 70 Challenger that suffered the same fate. This one last about a year with limited driving.
The autopsy revealed that the #3 int. valve had dropped and killed the head and piston and had scattered valve seat bits through out the other bores.
The lash cap and keepers were still in place in the retainer and the tip was in the lash cap but there was another piece shaped like a "C" on the below the tang in the keepers. The bottom of the tip that was left in the lash cap was convex so it had run in a broken state for some cycles. The order of failure was the hardened tip had broken off of the valve and had run with .100" remaining to hold the valve in the retainer and this had peeled off the end of the valve to the point where it let go.
If the valves in your heads were the Mopar Performance valves, take a measurement of the tip that was left in the lash cap and make sure the tip is the same as the tip length of an undamaged valve. This one here was the same length if you stacked the 'C' shaped piece on it, so it was only the hardened tip that initially broke.
Hope you can salvage some of this!

Terry

[Peter Ash]

For added information regarding lash caps. I have seen lash caps which land on the keepers, causing failure.

[Phillip marvetz]

I just checked the lash caps, They have clearance. Thanks for the ideas.