[gtofreek]

Originally Posted by gtobob67

Paul, what tooling process did you use to add those slots in the lifters?

Jeff did the work on them at the shop. He squared them up in a mill vice, in the Bridgeport mill, then used a 5/16 end mill to cut it. They were hard to cut. That's why I feel modifying the block is a better idea. But that would have to be done before a block was assembled. Modifying the lifter is very touchy, as you can't raise the band very far or it will poke out the top of the lifter bore at full lift. Extending the oil hole in the block down another 1/4" would leave no limits on lobe lift. A .353" lobe is getting pretty close, so not sure how a .388" lobe would do with this modification. As it is, with as high as we went, it's only about .030" from poking out.

Good news is the engine is much quieter. There is now just one lifter making some noise, instead of all of them. I will post a video of before and after later. Probably not for a few days though.

[gtofreek]

Originally Posted by AG

Just make a channel (~0.040" deep?) leading from the oil hole in the block down about a 1/4 inch?

We are going to make a fixture that will slip down into the lifter bore, and sit against the top of it, then machine a slot in it to the correct depth to to use as a guide, and to protect the lifter bore from the end mill. I'll post a pic when it's done.

I would say 1/4" should be plenty. If it is wide enough, .040" may work, but I might feel more comfortable at .060", and as wide as the 1/4" hole, so it has all the volume it needs.

[dataway]

Lifters would probably machine a tad nicer with a carbide bit with a very small radius corners. I could tell from the picture of the lifter that something wasn't happy.

Do you mean a lifter bore jig something like this?

[gtobob67]

Picture of the block when done would be great. I'm ready to assemble my roller motor now but on hold waiting for the outcome here. Timing of this thread was perfect for me and I'm sure many will benefit from it. Thanks much Paul!!

[gtofreek]

Originally Posted by dataway

Lifters would probably machine a tad nicer with a carbide bit with a very small radius corners. I could tell from the picture of the lifter that something wasn't happy.

Do you mean a lifter bore jig something like this?

Yes, lifter body was very hard, and hard to cut. You drawing is close, just need a lot more room to work through.

[HWYSTR455]

Think I'm just going to bail, and go back to solid rollers.

Still not clear how some have no noise though. Maybe the base circle, and/or the location of the hole in the lifter bore? I would think the holes in the lifter bores would be somewhat controlled, and consistent?

Not clear how some get replacement lifters for noisy ones that end up quiet either. What, tightening up the internal clearances makes them less sensitive to the volume of oil they get?

.

[i82much]

Originally Posted by HWYSTR455

Think I'm just going to bail, and go back to solid rollers.

Still not clear how some have no noise though. Maybe the base circle, and/or the location of the hole in the lifter bore? I would think the holes in the lifter bores would be somewhat controlled, and consistent?

Not clear how some get replacement lifters for noisy ones that end up quiet either. What, tightening up the internal clearances makes them less sensitive to the volume of oil they get?

.

Good luck, and keep us posted. For my part, I had issues with a solid roller build and went hydraulic roller for that very reason. As best you can tell from reading the internet, I personally think your chances are better at a reliable street engine with a hydraulic roller build than a solid roller, even given all the concerns raised in this thread.

Eventually I will get around to pulling my valley pan to see whether the oil band on my new Comp 857's lines up with the oil holes in my IA2 block. For now, the lifters seem quiet, the car runs great, and the combination is exactly what SD Performance seems to sell hundreds of, so I think everything is going to be ok.

["QUICK-SILVER"]

Originally Posted by HWYSTR455

Think I'm just going to bail, and go back to solid rollers.

.

Just talking about making what you got work.

Could you get a little longer pushrod and adjust a set of HR's from the bottom up instead of top down?? Then just set them at what ever gap like they were solids.

I'm puzzled by some noisy in one engine and not in another. It sounds like spring pressure is out running bleed down rate on the lifter. Weak plunger spring? Faulty check valve? Their not recovering for some reason when the valves are closed. If the plunger cup is full, looks like the lifter would refill.

[i82much]

Originally Posted by "QUICK-SILVER"

Just talking about making what you got work.

Could you get a little longer pushrod and adjust a set of HR's from the bottom up instead of top down?? Then just set them at what ever gap like they were solids.

I'm puzzled by some noisy in one engine and not in another. It sounds like spring pressure is out running bleed down rate on the lifter. Weak plunger spring? Faulty check valve? Their not recovering for some reason when the valves are closed. If the plunger cup is full, looks like the lifter would refill.

I have heard many times that the newer Comp 857's are much better than the old full travel version. I have also heard that the old 857s short travel version was much better than the old full travel version.

[71 T/A]

So which are the best HR lifters for Pontiacs?

[71 T/A]

What about the short travel Johnson HR lifters Butler sells?

[grivera]

Originally Posted by 71 T/A

What about the short travel Johnson HR lifters Butler sells?

Not sure if those are the ones Paul was referring to here:

http://forums.maxperformanceinc.com/...2&postcount=53

[tom s]

Lets see if this works.Email from Dave at SD.Tom
https://mg.mail.yahoo.com/neo/b/mess...OTVulw&fromId=

[JLMounce]

Access denied on my end. It's likely tagged to your individual email account. You'll probably need to copy/paste.

[tom s]

I did copy and paste.Tom

[tom s]

try again
Oh my word!!! I don't have time to read all that but FYI the new Comp 857's previously sold as 857S (the ones you have been using) have the oil band 1/4" higher than the old style 857's which sure look like the Johnson lifters and I've had them in the shop and the oil band is in the same location so this might be a big part of why the new 857's have been working so well. Not saying I haven't had any issues but it's been a fraction of a percent of what we've sold and in one case I'm convinced the customer wrecked them by bottoming them out instead of following the correct installation instructions.

Everyone seems to like to dump on the Comp lifters but I've had plenty of customers with issues with all of them and in my opinion the current 857's are a good lifter that has been very reliable overall.

I'm stupid busy in the shop for the next few days so I don't need a distraction but you're more than welcome to share the info I just shared with you and thanks for the heads up on the thread.

[tom s]

There you go!Tom

[JLMounce]

Thanks for sharing the information!

[TCSGTO]

Originally Posted by tom s

try again
Oh my word!!! I don't have time to read all that but FYI the new Comp 857's previously sold as 857S (the ones you have been using) have the oil band 1/4" higher than the old style 857's which sure look like the Johnson lifters and I've had them in the shop and the oil band is in the same location so this might be a big part of why the new 857's have been working so well.

The way it's written is a little confusing. Is he saying the new Comps or the old ones look like the Johnson lifters?
You gotta love Dave though. The guy is a machine. He really has no use, or time, for forums.

[tom s]

The Johnsons bodies go straight town the sides where the roller shaft is.The Comps are rounded just above the end of the lifter body.Might be made by Johnson but to diff specs by Comp.Not sure how high the bottom of the oil band or where the oil hole is located on the Johnsons but in my pic you can see were they are located from the face of the roller with the rule next to it.Tom