One of these things is different than the others.....

[Davesmopar]

Are you aware that 340 arms are different from anything else?
And that the 340 cam needs 340 valve springs, installed at the 340 spec height.
Ima thinking that your valvesprings lost control and the cam slapped the lifter, slapped the pushrod, and the rocker arm was coming back when POW! they met going in opposite directions.

You can tell the 340 arms by flipping them upside down; they are clearance-ground for the larger diameter 340 dampered springs.

the DC-268/276/114 is a pretty good street cam, in an engine with matching cylinder pressure, and if yours is still in good shape.

I'm running 340 heads with stronger springs with helper springs.... springs set for. 500(+) lift, rockers show no signs of clearance issues....

9.1:1 compression ratio......heads running 188's and fully ported and polished 80% of the vlvvť

Basically I had a 340 and the block was cracked so I used the heads intake, 340 spec cam... forged pistons....

I just think that you can shift at 5-6K so many times before something breaks ..... lol

 

[MiradaMegacab]

I upgraded to the Mopar Performance Roller Rockers and pushrods made of lead....... Lol

 

[Duke5A]

Those look an awful lot like Proform roller rockers. MP certainly didn't make them, so probably rebranded. I ran a set on a 360 and could never keep the adjusters from backing off. One of the rockers even had the threads stripped out of it. Keep an eye on those.

 

[Davesmopar]

Ok here is an update.....

Not sure if I posted that or not.....

Here is the new parts.....

I installed them Thursday, still have to change the oil before test firing it...

More to come.....