Just a reality check - are all stock stamped steel rockers for LA 318s and 340s interchangeable?
stamped steel LA rocker arms
- Thread starter str12-340
- Start date
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pishta
I know I'm right....
Supposed to be a heavier stamping in the 340/360 but that was debunked once. But they are the same dimensions.
I was culling through my stock of stamped rocker arms yesterday, looking for a set to clear the 1.5" O/D springs on my 360. Some are ground for clearance, I always assumed bcause 340/360 springs are larger diameter. Also, some have a more pronounced "detent" where the spring/retainer would be. I also have some of the supposed HD rockers, which seem to be stamped LH/RH vs. LT/RT, and I've found a weight difference of 15-20 grams. Again, this is all based on what I've found with the ones I have.
I know that Direct Connection offered heavy duty stamped rockers - I have a set on one of my engines, but the overall dimensions are the same, which is the question... this is on a 318 street engine and I wanted to make sure that any of the stamped rockers that I have around would fit. Has anyone ever see the pocket for the push rod fracture and break away?
The engine ran just fine, but when I went to replace a failed valve cover gasket, there was the top of the pushrod visible through the rocker. It never pushed through the rocker and the tip of the pushrod doesn't seem damaged at all. The pocket just fractured all the way around including splitting the oil hole - not worn through.
The engine ran just fine, but when I went to replace a failed valve cover gasket, there was the top of the pushrod visible through the rocker. It never pushed through the rocker and the tip of the pushrod doesn't seem damaged at all. The pocket just fractured all the way around including splitting the oil hole - not worn through.
Back when the 340 was new we broke plenty right at that spot
even with stock spring pressure.
I do believe the 340 rockers were heavier duty from what I remember
back them.
even with stock spring pressure.
I do believe the 340 rockers were heavier duty from what I remember
back them.
I had a pushrod go right through the rocker once. Popped the top right off the pocket, it landed in the valve side of the arm. 470-something lift, not a lot of spring pressure, just cruising down the freeway.
Where the heck is Winock, WA ??? - I even tried googling it with no success
junkyardhero
Well-Known Member
yeah, the overall dimensions are the same.
as long as you're not concerned with the 340/360 "notch" to clear big springs (which i'm guessing no), then go on ahead and ship it.
and yeah, i've seen the pocket/cup tear/fracture and pull away. stock 2bbl 360 no less!
About 10 miles south of Chehalis/Centralia.
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