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https://www.google.com/aclk?sa=l&ai=DChcSEwj4koWy3NKDAxUnX0cBHeOPB3MYABAAGgJxdQ&ase=2&gclid=Cj0KCQiAnfmsBhDfARIsAM7MKi0nknbxLqs9UFse39J4NvBBRaPs44mSDXEXRA3BtQPDEUeXvlT9fYsaAk8IEALw_wcB&sig=AOD64_3BgZ9cu5tUYnRS2Y6pQghEV8G3wQ&q&nis=4&adurl&ved=2ahUKEwjN0P2x3NKDAxWQv4kEHW5LDdEQ0Qx6BAgFEA I've...

I had this with the double roller I installed in my LA. when torqued the balancer snout sandwiches the slinger. If the chain links and pins are wide enough they rub the inner surface of the slinger during rotation ,making a pretty "spirograph" (how old am I)pattern etched into the tin and plenty...

Not sure, I don't have any cast heads. The real issue is the close proximity of the injector bosses to the gasket rails.

Here you go,I put a straight edge along the upper rail to show the gaps.Between the injector bosses and cover rails, I figure about a 1/4" total. Stamped covers would require considerably less. BTW a note on the "fabbed" covers now being sold by some of the bigger names (rebranded china...

When I get in tonight,I'll take closer pics

I use the SV intake. If using aluminum heads and non stock valve covers ,there are issues. Grinding of the injector bosses and upper valve cover flanges (depending on brand)will be required.one picture shows a cast cover not able to seat ,The fabbed covers had to be "notched" to clear the...

I also use the Moroso's. I had to modify them a little for the Edelbrock heads where the bolt ears meet the rocker shaft pedestals, but have had the covers on and off a bunch with no issues.

Glad you got it figured out .

the test I posted ensures the valve is seated during no vacuum and opens(vacuum leak) with vacuum applied. You've already tested the diaphram,so there's either another leak which is made worse with egr open or it would seem the temp control valve might be leaking allowing at idle egr

What is your base vacuum reading? Being carbed, with added vacuum it should roughen up.On a B2 I wouldn't expect less than 19"hg without a leak

I'm guessing it's a B series truck,this is from Alldata. I hope it helps Testing and Inspection Remove air cleaner. Start engine and run it until it reaches normal operating temperature, then shut off engine. Disconnect vacuum hose between EGR valve and water thermo valve at EGR valve...

I'm using it in my 408 roller, no problems, though as it wears timing is effected. With my XFI sportsman EFI I set a code at the top of 2nd gear once for #1 reference out of range. It was time for a new gear.

not harsh, point made.

here it is...

The current ID on the failed rockers is.874" on both sides and are not out of round. Again, this engine has over 1600 miles on it, 2 seasons of driving and was apart in January when I replaced the Crane retro roller lifters for the Hughes. I had 1 lifter that came up to high in its bore and...

Edelbrock performers with the steel PRW/PQ holdowns that came with the kit. The exposed shaft is mostly a reflection, There are 3 different shim materials and the thinnest is shiny spring steel. The roller tips have/had full coverage on the stems.

I appreciate all the feedback, and expert advise. Since starting over I will again be doing the geometry process. For the record and according to the 8 page setup instructions that came with the new setup, my roller wipe pattern, (that was evident on the non damaged valve stems) was in spec with...

The builder that sold them to me with the top end components offered to take care of it for me,but I opted to switch brands. I'm sure that these probably work fine for most applications and mine isn't that special. They just failed on me, the two years I've been using them have been eventless...

Kinda',though the boat ran longer and harder. The end result would seem the same

The fact that they broke in the same place on the same side was suspect. Especially since it was 2 on each bank.The wear pattern I saw on the valve tips would say they were hitting flat.As far as being skewed over the valve,it doesn't look that way, but shouldn't affect the valve side of the...

No It's about .040" untouched top and bottom.it was the first thing I checked after I took it apart. The heads are already at the machine shop getting checked and 3 valves, so I can't get pics till Friday. As far as B3, let me get all my stuff in hand before I get involved in that.Thanks

This was my main concern, I understand that if in fact the roller slid inward off the valve tip and jammed, breakage would be inevitable (and would've started at the thin part of the roller) and this post/question would've been different. The stress fractures seem contradictory to geometry...

Thanks for the input. The roller sweep wear is dead center with about .040" untouched top and bottom. The retainer interference wasn't just a little. The rocker shaft couldn't be bolted down. The pic is during assembly with no pushrods. To get the centerline where it needed to be would've needed...

I felt the same way about reading of failures and not seeing. That's pretty much why I posted and to see if maybe I missed something. But after 1600+ miles and only three and a half trips down the track I would tend to believe its parts failure. The heads should be back before Friday (3 chipped...

well ,if anyone wants to add 4 new ones they can have the set....... I didn't machine anything I noticed it during assembly and replace the springs before fire up Have you run it yet?

The heads were purchased assembled as part of a "blueprinted" known performance top end. They came with the roller cam and rockers. I did have to change to beehives due to the retainers locking up on the fulcrums. Geometry wasn't the culprit, just clearance. The replacement springs were sent to...

I have my limiter set at 6500 through the FAST XFI system, It did bounce off it quickly in the water box , Shift point/light is set at 5800. I just can't figure out how the cracks start and open at the top and not at the thin roller end. That's the part the would make me think casting issues...

So I took the car to E-town Mopar show for the first time. I planned on making some time runs and if all went well park it in the show and make it a day. The first 3 passes in this car since finished netted an 11.4,11.3 and a shut down at 1000' 11.4 . I didn't want to screw up the cars racing in...

was cranes now hughes on a comp cam