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The case is prone to cracking at the pinion pilot support bearing. I had one do it. It was hard to see.

FWIW please adjust the valves using EOIC before you get crazy with the lifter theory.

Johnson

Possibly

I am not saying this is your problem but if you exhaust all other possibilities in resolving the adjustment issue maybe as a last resort try putting in a set of good quality standard lifters and see what if anything that does. The grooved lifters seem to be the one component that deviates from...

Isn't that what the "cam saver" lifters are? A lifter with a groove in them to bypass oil to the lifter face?

I wonder if the notched lifters are bleeding off too much oil pressure and not allowing the lifters to pump up?

This may not be accurate enough with a performance grind camshaft. Try doing it using the EOIC method.

E4OD is a very large trans and may require trans tunnel mods. 4R70W with adapter and an electronic controller is the way to go IMO.

Maybe get them uncoated, fit them and have them coated locally.

OK I see what you mean. They are not like that. They fit well and are very nice quality. I had to dimple one tube with a hammer because it was very close to the box. This may be because I was not using factory motor mounts. IIRC they were around $500 plus shipping uncoated but that was 10 years ago.

I have FPA headers. They are a mid-length header that fit pretty well. The driver's side required a little clearancing around the steering box. Not sure what you mean by going under the cross member.

You aren't going to hurt anything with low speed air bleed changes. You are looking to determine if the issue is the result of a lean condition. The easiest thing to change to help you do that are the air bleeds. If that change seems to help you know you are on the right track and that up sizing...

With a stock cam I doubt it is cam surge. I think more likely it is lean in that area of operation (which is usually the t-slot) and/or you are experiencing some detonation because the high compression ratio with the stock cam is going to require something higher octane that pump gas premium...

Yes he took an original 72 R code and "improved" it. I haven't seen anything posted on it in a long time. Edit: Here it is https://www.7173mustangs.com/thread-update-on-500hp-electric-72-kigerstang

Clean is the word! Well done!

Welcome. Hope your Dad is doing better. You have been a busy boy. Looks like you're having fun. Good job on the floor, but major bummer on the tire blowout causing body damage. I think you made the right call on the skull delete.

I use the Goggle search tool on the Forums page.

Maybe 400 hp 450 ft/lbs

You may find some more of those chunks if you ever pull the oil pan.