Comp Cams DLC Hydraulic Flat Tappet Lifters

[sjre]

We should be doing the break-in later this afternoon, I will post results ....

Under what conditions will they be broken in, springs ,oil ? Please tell us the results . What if they actually work ?

[Procharged 434]

We should be doing the break-in later this afternoon, I will post results ....

Under what conditions will they be broken in, springs ,oil ? Please tell us the results . What if they actually work ?

It will be broken in with full spring pressure(PAC single spring w/damper), which have 115lb on the seat, 300lb over the nose, 1.6 Comp Ultra Magnum Rockers, and Lucas SAE 30wt Break-In oil. Break-In time will be 30 minutes with varying RPM 2000-3000 RPM.

[sjre]

Thank you , like you said not much out there .

[Monza355]

How did it go ?

[benno318]

Genuine GM chilled iron base lifters are back in production.

20231115_084259.jpg

where are you buying these from, legend?? (im also in australia)
i only have a few original sets left in my stocks, been refacing older 2-pc lifters will be good to have a new source again

[Procharged 434]

How did it go ?

We got delayed, found the Radiator seeping coolant, so we are awaiting a new Radiator, then it should be ready. I will post an update here just as soon as possible

[KnightEngines]

Genuine GM chilled iron base lifters are back in production.

20231115_084259.jpg

where are you buying these from, legend?? (im also in australia)
i only have a few original sets left in my stocks, been refacing older 2-pc lifters will be good to have a new source again

Crow have them, they only brought a few sets in tho, just to check them & make sure they're good.
They have a huge order in now they've confirmed quality.

[Tuner]

Genuine GM chilled iron base lifters are back in production.

20231115_084259.jpg

Anyone know who is producing these? Last I heard here, Johnson HyLift was the only remaining US lifter manufacturer.

Bonus question - the button on these is reportedly chilled iron. Way back when, Ed Iskenderian told me chilled iron lifters were not supposed to be run on iron cams, only on steel or hardface overlay.

This is true. Isky catalogs specified chilled Iron for steel and hardface overlay, hardenable iron for regular iron cam cores.

[Procharged 434]

Ok guys, finally an UPDATE!! We got the new radiator installed, and we got it broken in today. Everything went really well and break-in was a success, ZERO issues. The valvetrain seems to be nice and quiet as well. We made sure the carb bowl was full of fuel, made sure it had plenty of timing, and it fired up immediatley. We ran it in a range of 2200 to 3200 RPM for 35 minutes solid, varying RPM.

This is a pump gas 383 Small Block Chevy with ProMaxx "Project X" 185cc aluminum heads, and 10.2 Compression. We used the new Comp Cams DLC Hyd flat tappet lifters, along with the Lunati Voodoo 10120704 camshaft, 281/289 Advertised Duration(per cam card), 233/241@.050", .538"/.560" lift w/1.6 Rockers, 110° Lobe Seperation, camshaft installed at 104° Intake Centerline. We used the Lucas SAE 30wt Break-in oil and Wix filter, along with Isky Rev-Lube(black moly version) smothered on the camshaft lobes and lifter faces. It was broken in with full spring pressure(115lb Seat, 305lb over the nose) and Comp Cams Ultra Pro Magnum 1.6 Ratio Rockers during the break-in. This is in a 1983 Chevrolet K10 4x4 truck with a 700R4 trans, 2300 stall, and 4.10 Gears. Break-In was a success, without any issues whatsoever, hope it continues! I gotta say, I am quite surprised of how quiet the valvetrain is as well. So far so good!!

[Monza355]

That’s great too hear thanks for the update

[Highclasslowlife69]

Hey procharged that’s awesome news and makes me excited about the future of flat tappet cams so excited that I actually made this account so I could reply to this lol in addition to the lifter mating to the camshaft properly I wonder if these lifters will have bleed down issues have you started it up dead cold since the break in? I’m curious if you’ll get the tick for a few seconds upon start up I currently have this issue with my c10 that has a summit k-1102 cam in it with their “brand” lifters they mated to the cam but a few have bad bleed down issues

[Tartilla]

It seems to me one of the biggest variables that no one really measures, save for big $$ efforts, is lifter bore locations and their deviation from design.

What about the ensuring the lobe face angle matches the lifter angle to maximize contact area and ensure lifter rotation?

[Tartilla]

Flat tappets were great back when you could walk into any auto parts store and any oil on the shelf was compatible. I lost three engines in the same week after doing oil changes on all of them, back in 2001 or whenever it was, when the oil specs changed. Never again for me. You guys have fun mail-ordering specialty oil for your obsolete lifters, none of my local stores carry anything that works.

This us why I don't bother looking for such oils.
I run a readily available anti wear oil additive in normal oil I can get both easily , here.

Glad you've found an easy combo solution that works.

I've been wary of mixing additives. More does not always make things better.

Interested in your formula.

I need to run 2x mild BBC flat cams, GM factory 224° 0.510 lift cam/lifters, in a blown marine application. These are low hr use engines per yr, so reasonably expensive oil is not so much of an issue. My plan is to get a system that works, and use oil sampling to determine oil changes. Stored heated indoors over the winter.

[Tartilla]

Hey procharged that’s awesome news and makes me excited about the future of flat tappet cams so excited that I actually made this account so I could reply to this lol in addition to the lifter mating to the camshaft properly I wonder if these lifters will have bleed down issues have you started it up dead cold since the break in? I’m curious if you’ll get the tick for a few seconds upon start up I currently have this issue with my c10 that has a summit k-1102 cam in it with their “brand” lifters they mated to the cam but a few have bad bleed down issues

Both my BMW M-62 V8 OHV lifters bleed down if they sit long enough and need oil pressure to sort them out for a few seconds. But that's a far simpler system compared to the pushrod/rocker slack.

[F-BIRD'88]

Flat tappets were great back when you could walk into any auto parts store and any oil on the shelf was compatible. I lost three engines in the same week after doing oil changes on all of them, back in 2001 or whenever it was, when the oil specs changed. Never again for me. You guys have fun mail-ordering specialty oil for your obsolete lifters, none of my local stores carry anything that works.

This us why I don't bother looking for such oils.
I run a readily available anti wear oil additive in normal oil I can get both easily , here.

Glad you've found an easy combo solution that works.



Interested in your formula.

I simply use Shell Rotella T 15W-40 and ½ the can of MolySlip E Oil Supplement per oil change.
It does have some zinc in it but the main anti wear additve in it is Moly. It works in any engine oil.
I feel a ½ can dose is plenty. "More is not better".
Both Moly and Zinc are sacrifical so you just want to maintain that lil bit in the oil.
There is an American Distributor of Moly Slip "Mr. Moly"

IMHO Liqui-Moly is a good alternative for this.
www.molyslip.com If your cam or lifters is already worn it won't fix that. Start new.