What are the differences between the 4.5 and 5.6? They both are M117-series engines. Are any parts interchangable in the valvetrain? I wouldn't think a piston would be, but would the cams be "Higher performance" if compatible at all?

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

The differences are significant; the 4.5 through 1980 was an iron block, but MB changed to aluminum from 1981 on for the 380 and 560. Don't know how much is interchangeable, but I'd expect not a great deal.

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Craig Bethune

'97 SL500, 40th anniversary edition

'04 Olds Bravada (SWMBO's)
'06 Lexus ES330
'89 560SL (sold)


SL--Anything else is just a Mercedes.
(Kudos to whoever said it first)