Don Terrill’s Speed-Talk

I spoke with Jesel about this when I ordered mine. The response I got was that they built a bushed lifter because customers were asking for them, not because they thought that they were any better than a needle lifter. I run my Jesels with about 375seat and 1,100 open.

For what it's worth... I just had a customer break the casting on a M155 (not HV) pump. 7,200 rpm engine, 1/8th mile deal. Apparently Milodon makes their pumps from stronger material to help prevent this. I'm sure others do as well? Milodon also makes a pump support brace. Cheap insurance. My custom...

n2omike wrote: ↑Fri Jan 20, 2023 2:52 pm Are you sure the valves are not STRETCHING... which would thin them out in the middle?

No, they have a distinct wear pattern where they have been riding in the guide. There is a ridge where the wear starts and stops.

Baprace wrote: ↑Sat Jan 21, 2023 1:06 am SRS_Chris, is it possible the heads were assembled with 8mm .0315 LS valves ?

No, they started life as 11/32 stems.

I have run into this situation a few times with E heads. I’ve only seen it happen on heads that were run “ootb”. One set of SBC heads, a few sets of BBM heads. Heads that I have prepped/sold, when they come back in for freshening have essentially no wear on the valves. My summation was/is, the guid...

In both instances they are the valves that came in the heads from Edelbrock. Stainless valves with bronze guides. Beyond that, I'm not sure what specific stainless steel or bronze materials Edelbrock would use.

I came across something a little unusual for the second time today. The valve stems on all 8 intake valves were worn beyond recognition. I didn't measure, but think .030" wear! The middle of the stem was worn away. This is only the second time I have ever seen this. The first time both intake a...

davidbraley wrote: ↑Fri Jan 13, 2023 12:28 pm https://www.magnifier.com/40x-measuring ... eticle.htm

That's neat! Thanks.

Otherwise, if you want to measure it, eye ball it will a caliper. It's not highly critical if the seats vary by a thou or 2 in width This is what I am curious about. If anyone has any other measurement techniques besides "eye balling it" with a caliper. The reason I ask is because I like ...

How is everyone measuring valve seat cut width(s)? I have tried various methods, but have not really found a way I like/trust yet.

Call Jesel. They may have a set on the shelf for you. I sent a set back not too long ago because they were incorrect for my application. Worth a shot.

As a few of you have suggested, it really just seems like the studs are not up to the task of handling the increased spring pressure. I suppose this should not come as a huge surprise as many of these parts are supplied by the lowest bidder to GM. Hopefully a set of ARP's cures the issue.

The rocker arms need to be checked for clearance. Clearance of the stud and spring retainer. An unbent paper clip works for this if thick enough. Crane came tech info explains this. Most owners expect valvetrain parts are just bolt on and go and find the bad results later. Did this already... not t...

BOOT wrote: ↑Tue Jul 10, 2018 6:18 am First what size stud?

Is this a power adder engine and if so is it the exhaust studs?

3/8" stud

Naturally aspirated engine. Not a real power house by any means. The two studs that broke were both intake studs.

midnightbluS10 wrote: ↑Tue Jul 10, 2018 6:13 am You were still using the stock, non-adjustable Vortec rockers when the studs broke? Roller trunnion with non-roller tip?

They were adjustable style, self-aligning, 'ball and socket' (non roller tip, non roller pivot) style rockers.