OK, back to car stuff. :D

Starter works, valves readjusted again as setting them from zero lash (just to the tension the pushrod wouldn't turn) and pre-loading a 1/2 turn was resulting in a couple rattlers. Re-adjusted checking the previous pre-load when backing them off and reset them with 5/8 pre-load which quieted them down but still detect a little valve train clatter so I'll probably give them another 1/8 turn for a total of 3/4.

After the valves I pulled the card to check transfer slot exposure which is supposed to be .025" according to the Holley tech. My Demon was spec'd at .020". As suspected due to flat condition right off idle, the transfer slots were not exposed which probably happened during the break in when my helper dialed them open and didn't note the turns in.

I fire the motor with the slots set at .025" and fuel screws at a rich 1.75 turns out, and the idle bypass circuit in the mid position approx. 2.5 turns out from open. When up to temp the idle speed was 2,200, closing the idle bypass circuit lowered it to 2,100 rpm.

I tried leaning and richening the fuel screws to see if they would have any impact on idle speed adjustment via the bypass valve but no luck. I backed off the throttle idle screws 5/8 of a turn and obtained 1K rpm but from the top of the venturi's it looks like the transfer slots are close to zero exposure again. A quick test drive indicated it was still a little flat when the clutch fulling engaged but it was an improvement from previous settings.

Looks like the only way I'm going to get some transfer slot exposure and the idle speed around 900-1,000 is by backing off the 16* initial timing and setting idle speed with initial timing to a point that allows some idle speed adjustment via the carb circuits.

Then make up the loss of initial timing with more total mechanical and quicker ramp up via lighter springs.

Does it sound like I'm on the right track?

Long answer - yes


Short answer - yes


Be careful trying to quiet down the valve train... you don't want to preload those hydraulic lifters too much. Half a turn on ARP studs equals .030" and a full turn should be .060"

Can't remember - did you go with flat tappet cam? What's different? Rocker arms? Rollers?

Flat tappet same cam specs reground, existing rockers - Comp Cam Magnums stamped roller tip 1.5 ratio, existing push rods, new Sealed Power HT817R lifters.

The heads didn't have studs, I installed Comp Cam 45022's that are 3/8-24, previous heads had 24 pitch thread also.

Don't want to cross the line, that's why I started at 1/2 turn which appeared to be what the shop had them set at. When that didn't quiet what sounds like one or two lifters when decelerating in the 2,000 to 1,000 rpm range I double checked my work and added an 1/8 turn. I only did a short trip around the neighborhood so a longer drive is in order.:D

The typical recommended pre-load is 1/2-3/4, but you can find recommendations of up to 1+ and if it's on the internet it's true. :D

Yeah ---- I'd be waiting for Jer to chime in and see what he thinks...

I'm not a lifter guy... and run hydraulic rollers -- but I also have lifter noise in my hot rod motors... but it doesn't bother me... cause I also have injectors clicking etc. That's why I love loud exhaust!


LOL

It's times like this I wish I had mechanical lifters. :D

The exhaust isn't quiet and it does have a quiet gear drive........... :P

I go zero lash then 1/2-1 turn.. (some guys only go 1/2 turn) I adj intake when exhaust starts opening and exhaust when Int starts to close

IMOHO once the cam is broke in, I like to go over it again with the engine running, I have a cut valve cover to stop from making a total mess

Back off the rocker nut until you here a clicking and then tighten down until the clicking just stops then go 1/2- 1 turn

This can explain it better then I can and saves me from a lot of typing ;)


http://www.crankshaftcoalition.com/w...raulic_lifters

http://www.cadvision.com/blanchas/54...c/tappets.html

then another 1/8 turn while tightening your lock allen.....are you positive it isnt a header leak? triple check. that one gets everyone.

Thanks Jerry :thumbsup:

I ran them lifter heading down adjust the adjacent valve.

The more I thought about it adjusting while running made sense. I could take the plasma cutter to the old set of valve covers.

Appreciate the input.

NO! But I did think about the possibility more than once. :D It sounds too mechanical to me and during low rpm during decel though they sound a little lose at initial start-up. Lower oil pressure levels in both conditions.

You always come up with the logically obvious! Obviously a lot of experience. I will double check though. :thumbsup:

MAKE SURE YOUR ROCKERS AREN'T HITTING THE VALVE COVER I ran the same VC's you are and some of my rockers were hitting