I'm not sure when it happened but damn. What's the plan? Start taking the heads off or am I gonna need to take the oil
pan off?

 

did the value drop in, because if you only need to replace it i once replaced all the value stem seal with just taking off only the value covers. you just make sure the value is closed and shoot 30 lbs of air pressure in that cylinder and use a tool that compress the value spring. as long as the air pressure is holding the value close it will keep the value in place without pulling the heads.

 

or you can just bring that cyl to TDC and do the retainer swap. The valve will only drop about 1/4" max before the piston stops it

? is did the broken part of the retainer drop "in" the motor

 

I ended up taking the heads to the shop and decided to pull the motor while waiting on the heads. Incase anyone is curious, it broke into 6 pieces and I couldn't find any pieces in the oil pan or front cover.

 

Ok sorry to bring this thread back from the dead, but I just broke another retainer on #6. It seems to be broken like the one in the original picture I posted which makes me think there is some sort of mechanical interference. I have no clue where to go from here.

comp cam 232/240 .579/.576. All valvetrain parts were chosen by a reputable shop that helped me choose the cam. I do know it's kit by BTR with Manley dual valve springs and tool steel retainers! CC pro mag 1.6 RR, trickflow 7.050 pr. I spun the motor over many times when building it and never saw any binding or interference.

Thanks for reading
👃

 

maybe you need to put some clay on the piston and check just exactly how much clearance you have. when its cold and spinning slow you'll have lot of clearance but when things get hot and expand not so much.

 

what is the max lift spec for the springs...with the 1:6 RR the math, assuming your cam lift #'s are using 1:5 RR. is .6176. If the springs do not support that much lift (read you should never be at max lift spec on any spring) you are going to break parts.

Is there any witness marks on the RR body on the intake side of the RR?

 

Already checked PTV clearance when building the motor.

 

Waiting to talk to the shop tomorrow about valvetrain specs, also cam card specs factor in 1.6 rr. I am aware not to exceed Max lift on springs....

The roller rocker body is worn but only because it started making contact with the outer spring. All the others are fine.

 

Something with the geometry is not right. What does the sweep pattern look like on valve tip after using a marker on it?

With RR body getting hit on underside near fulcrum, the PR may be to short

 

Pushrod length should also be ok. 7.050 gave me the thinnest sweep mark slightly on the exhaust side

 

...maybe your lifter(s) are collapsing...which would allow the RR to hit retainer. You would need to pull them to inspect and at that point I would look down the lifter bore and rotate motor to see if cam lobe is wiped on the 2 cyl that you have had retainer break just to rule in/out the cam lobes are good

I got the Lunati spring kit from Lloyd Elliott if you wind up replacing the springs/retainers