I see oGoBugeyes. Is. Viewing....

How about 28.1 in a 2020 Scatty Charger on regular pump 87 ?

That is some pretty good mileage Doc. I don't get that kind of mileage from my 3.6 300.

Yo oGo ... I’m kind of impressed toooo ... but better MPGs are expected.... driving it S M O O T H L Y ! ... the 28.1 was done on the flat ... I-75 in Florida with the cruise clicked at 71 AND the tires were at 44psi. BTW ... the tires were at 49 when I picked it up... SO MUCH for proper DEALER PREP ! supposedly it’s set at that high psi at the assembly plant for ease of loading on RAIL or a semi trailer. And quite honestly it did not ride uncomfortably and it handled and braked quite well.

Now ALSO .... the aero on your 300 is no so good ... compared to the Charger... so I’ve been told.

HRD just wait until you can have the block decked to finish the build. You know you won't be happy with it and will just wind up building another to replace it down the road if you don't.

I would but I already assembled the short block and put it in the truck while I was getting the heads done. I can't push it off any longer I got several big jobs waiting where I need the 3/4 ton and I am actively trying to sell the 1/2 ton.

the lack of quench on this one also so it just is what it is, pistons about .020 in the hole .035ish head gaskets.

Given any thought to the thinnest head gasket available?

Maybe it is not as important on the Hemi head because the quench flats are so much smaller than on the Magnum 5.2/5.9 V8 combustion chamber.

The Hemi head is supposed to have far greater “tumble”
as compared to “swirl” and “quench” on the Magnum combustion chamber..
Tumble is swirl turned 90 degrees.

The shallow “soap dish” cast into the Magnum 5.9/ V10 piston crown is to increase tumble in addition to increasing combustion chamber CC’s and adding some valve clearance.

The 5.2 Magnum stock piston does not have the soap dish and you would think the quench in the 5.2 would be of higher magnitude.

Willem Weertman writes a little about the piston design of the 5.9 V8 and how it was used in the iron V10 as well in his book “Chrysler Engines”

When I read this years ago I wondered:
“Is the dish of the 5.9 V8 a little too big because it also had to work in the V10?
Is the combustion chamber in the cylinder head of ideal size in the 5.2 with its flat top piston,
but a cost driven compromise in the 5.9 V8 and V10 ? “

If high compression ratio on regular gas is an indicator of good chamber gas velocities
the 5.2 beats the 5.9 V8 and 8L V10 by that measure.

The aluminum Viper V10s had several “tweaked” chamber and piston crown features over the years.

Does your SRT8 have sodium filled exhaust valves?

Seems like I read that the SRT package mods included sodium filled valves one year.

The SRT8 has eagle heads, it's got serious compression, eagle heads have about 10CC smaller chambers that the 6.4. I did mirror polish the entire head of the ex valves on that to keep them from absorbing as much heat from combustion, I did the same on these.