U-928

I'm just getting back into reassembling my 4.7L. after about 8 years apart. It's the replacement engine for my failed 4.5l in my '82.

Is there anything specifically different between readily available M12x1.5 Class 10 Steel nuts and the OEM (and filthy) cylinder head fastening nuts? Hard to justify $2+/pc for new oem, when i can get identical spec'd ones for half the cost. I'm reusing the OEM washers as they're in good shape unless I'm otherwise advised.

I'm backdating the cams to an early 78-79 set for the slightly better performance to go with the ported heads and headers. Since the cams are not native to the cam carriers, and my machinist says the cams are withing spec for the carriers, what should I be doing about the lifters? New set? Where from? Is the a VW option like there is on the 32V's

Cam comparison table courtesy of Storsek Ultra:


TIA!

928FIXER

New nuts and washers. I would never risk having to do the job over for the price of new hardware. Plus it's clean and shiny. Funny saying in the auto repair business,never enough time to do it right,but always enough time to do it over.
I do seem to remember trying the cam swap you are considering. The early cams and the barn door MAF do not get along together well. Not sure if the extra 200cc of displacement will help, as the LSA and overlap are different between the K-jet cams and the L-jet cams.

U-928

Overlap shouldn't be an issue with the cam, the plan is for Megasquirt, as I've done with one of my other cars. I do have the original cams from the '84 engine. A coworker with better knowledge of cams mentioned I might run into an issue with the earlier cams as the dynamic compression in the midrange would increase the likelihood for detonation, with the higher compression from the later engine (9.5+:1 vs 8.5:1).

Jadz928

Welcome back! Glad to see you still doing it.

GregBBRD

New factory nuts.
They are taller than regular nuts.

Re-use washers. They are special hardened washers designed to not bend. i have them replated routinely, so they look nice.

Lifters should never be moved from one cam lobe to a different cam lobe....the two surfaces "break-in" together. However, if you are concerned about 20 nuts at $2.00ea, the price on new lifters will put you into coronary arrest. (And you might consider a different "hobby car"....$80 of parts on a 928 is like $.01 on other cars.)
I've swapped '78/'79 cams into later engines a few times. Frankly, I couldn't tell the difference and quit bothering with this. I believe the slight change in cam timing was mostly because of the difference in the fuel injection systems of the two different models. (Don't the '80-84 engines make more power than the '78/'79 engines?)