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I can tell you the tensioners are different between the 5.7 and the 6.1

I believe the base circle on the cams are different also.

6.1s run a valve spring "shield" intended to control spring "squirm"

6.1s originally came with a "blue stripe" intake valve spring - this is allegedly a higher seat and open pressure than the "green stripe" you'll find in most later crate motors.

The G3 5.7 valve spring's also use a "sheild", cup, damper or whatever you want to call it, but from my experience, the tab's have beeen known to break off so I went to a spring locator with shim's.



From my experience as a dealer tech the original valve springs did not have that sleeve. They were prone to breakage and objectional noise. The TSB to replace all the valve springs came with the replacement springs that had that sleeve on them. I don't really think it was to address any "squirm" issue but rather more a noise issue.

"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.