So my 340 is .060” over, 9.8:1 compression, 308 heads ported and flowing 264 cfm at .500”. Originally a 4 speed with 3.55’s and now a T56 with 4.30’s, the 3.55’s just weren’t enough for the cam. 750 DP. Street car that’s getting pretty close to 40k miles now, the original Lunati PR lifters lasted until around 30k miles or so when I had a couple collapse and just never pump up again.
I’ve had adjustable rockers on it the whole time. The valve train has always been loud, it’s not a specific noise or tick at any speed it’s just louder than your typical hydraulic cam. Honestly sounds more like a solid lifter set up than it does hydraulic. And I’ve played around with the lifter preload (within reason), loose or tight doesn’t seem to change the noise significantly.
I didn’t trust the stock stamped rockers for that much spring, which is the reason I run the adjustables.
I like the cam, it’s a little too much for how much I use my car on the street but power hasn’t ever been an issue. It’s a rocket ship above 3k rpm, although it drops off pretty fast under 2,500 rpm. But between the cam, head porting and large carb it’s not surprising.
Do you remember your pushrod length?
Huh. I know they’d been having supply issues, I didn’t know Summit had dropped them.
