Maybe I could get them from Lunati. Summit quit handling Lunati products.So I run the Lunati 704 in the 340 in my Duster. I’m not some engine guru, so take all of this knowing I’ve only built a few engines and my 340 definitely had some hiccups. Initially I tried to run it with single springs on the advice of the guy that did the machine work on my heads. I wiped out a set of Harland Sharp rockers that way. Not enough spring for that cam. Maybe it’s possible, but it didn’t work for me.
I had my heads cut for doubles and run the recommended Lunati springs now. Not sure what you’re running for lifters, but the Lunati lifters that come with the 704 are their “performance replacement” lifters with the wire clip retainer. They worked fine for quite awhile, but then I started having issues with them collapsing. I replaced them with the Lunati Micro-trol lifters, they have a c-clip style retainer and are their higher performance lifter. So far those have been holding up well.
Lunati’s have pretty fast ramps, and the 704 in particular seems to be pretty tough of valve train parts. Now that I’m running it with the micro-trol lifters, Smith brothers push rods and Crane ductile iron rockers it seems to be happy.
These are the lifters I’m running now. Unfortunately it looks like they’re not available anymore…
Lunati 71977-16 Lunati Micro-Trol Hydraulic Lifters | Summit Racing
That sounds more like carburation....However the other day I put my foot in it and seemed like I lost power. It seems runs stronger with not full throttle. Motor was rebuilt 2 years ago.
I have had valve train noise since install. Not on break in with the singles. At 2200rpm I get ticking .It sounds like the valves. Not a lifter tick. Many others with this cam have complained of the same issue with this cam. Car is quiet on start up. After warm up it starts. Runs fine. However the other day I put my foot in it and seemed like I lost power. It seems runs stronger with not full throttle. Motor was rebuilt 2 years ago. Did 800 mile easy break in. I am running comp cam lifters, factory rocker arms. The lunati lifters failed. Thats why I switched lifters. Tried adjustable rockers. No change. I dont race my car. Like to drive it and occasionally put my foot in it. 71 340, .30 over, Holley 750dp, 2800 stall, 3.91 gears, headers.
Maybe I could get them from Lunati. Summit quit handling Lunati products.
It kindof depends on if there have been changes to; your operating elevation, or the ambient temperature. Lemmee see if I can remember this right; A change of 2000ft or 30*F, is one jet size.It could be carberation. Thought about that also.
IDK man; 234/242/110 is pretty big for street in an iron-headed 345. But you got most of it covered with the 2800/3.91s.
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.