Found the #1 intake pushrod in this condition after a run. The rocker, adjuster and lifter all look okay, which surprised me. No indication as to what caused it. The mangled end is the rocker end.
I don't believe so. The valves and springs look fine. I haven't pulled the head to look at the underside, so can't discount the possibility. Compression on the cylinder is good.Hit a valve ?
Solid or hyd roller? What was the diameter and wall thickness of that pushrod?
Solid roller cam, the pushrod diameter is 3/8. Not sure about the wall thickness.Solid or hyd roller? What was the diameter and wall thickness of that pushrod?
I'll see if any of my racing buddies have a bore scope. Easiest way to find out.Hit a valve ?
Get a bore scope and look in the spark plug hole and see if there is a mark on the piston.
I'll see if any of my racing buddies have a bore scope. Easiest way to find out.
Cut that pushrod off clean and measure the thickness.
I’d want at least .080”, and it should be heat treated.
Could be too much press with the insert which caused a split.
I've already ordered a new set from Smith Brothers, 3/8 chrome moly with .120 wall thickness. That's what my engine guy recommended.Pushrod looks kinda cheap...W2 setups are not something you want to skimp on pushrods. I'd put as big of a pushrod in there as you can get, double tapered if possible...just my 2c
What does the sweep pattern on the top of the valve stem look like?Found the #1 intake pushrod in this condition after a run. The rocker, adjuster and lifter all look okay, which surprised me. No indication as to what caused it. The mangled end is the rocker end. View attachment 1715804075View attachment 1715804076View attachment 1715804077View attachment 1715804080
nope, ball/cup push rods. The cup end is the end that failed.Looks like those are ball-ball pushrods. Too late but Checkout the Manley swedged end pushrods in 5/16”, 3/8” and 7/16” diameters with .080”, .120”, .135” and .165” thicknesses. Very likely available in the length you need.
http://www.Manley performance.com/dl/cat/pushrods.pdf
Yes, they appear to have plenty of clearance, I see no evidence to indicate otherwise. The heads were inspected back in the spring and everything looked good. Unfortunately I don't know what the open spring pressure is off the top of my head. I think I have the specs, I'll have to find them. I really think this was just a bad push rod that just eventually failed. I haven't found any other damage.Man I hate roller lifter that have the tie-bar on the outer side of the roller lifter. Is there any chance they hit the side of your block, I see the pushrods are close to the V on the lifter bar with W2 offsets. Are they clearing. Any chance of tight valve guides??? What’s the open spring pressure?