single groove lifter vs dual groove

I'm still fighting the lifter tick in my Dart, 78 360. I've found that my engine has the single groove lifters, while the ones the parts stores come up with are dual groove. Is there a difference, a aside from the extra groove? Any benefits? I'm debating putting those in, in hopes they will fix my tick. Thanks!

I'm assuming your preload is good. More info on when it started/what work preceding the noise. Have you pressed down on the rocker arms while idling (lifter end) while idling with a wooden hammer handle & any got quieter (those are the bad ones) to ID the specific noisy ones? & definitely not an ex leak which reportedly can be nearly identical & sometimes very hard to differentiate. Yes you might need new lifter(s). No info on the 1 and 2 groove difference. (only 1 oiling hole I am assuming)

It's a brand new engine, ~800 miles. Shafts torqued to 20 ft/lbs. Is been doing this since I started driving the car. Once it heats up, it develops a tick, and won't issue in gear. When the engine is child, it runs great. I have changed a couple of lifters to no avail.

I would definitely check preload distance (see if you have at least .020") & hammer haandle check em to see which ones are noisy. Clarify what you said it does when in gear (& is that idling or driving). I'm assuming your psi is adequate?

At hot idle, it has about 20 psi oil pressure. At idle in gear is when it has problems. Sometimes it idles OK, then drops down like it's going to stall. Sometimes it does stall, other times it doesn't.

On the stalling I would shoot a 3 second blast of starting fluid into each of the two idle mixture screw holes (remove the screws/count # of turns to lightly seated to easily return them to their original setting) & might need to enrich em slightly. 20 at idle is OK if it jumps up when you goose it. I would go ahead & check preload first for the clattering. I'm assuming you have enough initial for your cam

I have been adjusting the timng. Attached is the cam spec sheet. What initial should I run? Other than the cam, its a mostly stock 360, with an edelbrock 1406 carb.

that cam should be very quiet.

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What initial should I run? Other than the cam, its a mostly stock 360, with an edelbrock 1406 carb.

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15-18 on ported is fine. Might just be as simple as richening the idle screws some. I would definitely blow em out with starting fluid first tho. On the ticking, I would check preload & if good there it might be as simple as the noisy ones need replaced & if so a new cam breakin procedure needs to be done again