Bob,
Yes the Mid priced ($1785-$2285) Locomobile Junior-8 (JR-8) was an Over Head Valve (OHV) Straight 8, 198.9 CID Rated at 66 HP @ 3000 RPM.(Quite advanced for the time; "Listed as the first engine to go 3000 RPM". Now Noted as Contintenal "built for Durant". Further confirmed today by a Friend's sending me the 1926 MoToR Manual LOCOMOBILE specs.
Some MINOR CHANGES to previous data:
The BIG Luxury ($9500-$12500 Aprox) Model 48 was a 6 Cyl, 524.8 CID "T" Head built by Locomobile straight through to (1929 models*).
The upper Mid priced ($5500-$7500) Model 90 was a 6 Cyl 371.5 CID "L" head built by Locomobile from 1926 to (1929 models*)
The lower Mid priced ($2900-$3500) Model 80 was a Lycoming 298.6 CID "L" head Model 4HL. Sold by Locomobile 1927 to (1929 models*)
The NEW Low Mid priced ($1875 to $2550) Model 70 was a 8 Cyl, 246.7 CID "L" head Model 10S Continental. Sold by Locomobile from Mid 1927 to (1929 models*)
The Pen-ultimate LOCOMOBILE Model 8-88 ($3350) for 1929* then Final 1929 Locomobile called the Model 8-86 (Jan to Mar 1929). Lycoming 298.6 CID "L" head Model HDL.
* Model year Began Sept 1, 1928. Ref; National Used Car Market Report "Red Book" April,May,June 1931.
Note: Other references combined for more accurate data.
Lance C.

Do You own a car built by Durant? 25 Locomobile JR-8 Brougham, 25 Loco JR-8 Sedan, 26 Loco JR-8 Roadster project, 30 Durant 610 Deluxe Sedan

I have heard of guys putting IHC Red Diamond engines in their Packards. They are 450 or 500 cu in sixes. Getting close to that T-head Locomotive size! But they get those heavy old heaps really rolling from Minnesota to Arizona.

Do You own a car built by Durant? yes

Cdmn,
Yes you are right most of those big "Ole" Locomobile and other Big Classic "T" and "L" head engines were huge, low compression, not real high horsepowered but were real Torque-monsters. All the better to get 2 1/2 to 3 1/2 Tons rolling!

The FAGEOL from 1921 (Fagol Motors Co.,Hollywood Cal.) was a 142 inch WB, 6 Cyl, 825 CID (5" X 7" Bore & Stroke)Hall Scott monster, that put out 125 Hp at 1300 RPM! Sold as a Chassis only on 34 X 4.50 Tires, and priced at $12,000 in 1921! Wow, 825 Cubic Inches!
Lance C.

Do You own a car built by Durant? 25 Locomobile JR-8 Brougham, 25 Loco JR-8 Sedan, 26 Loco JR-8 Roadster project, 30 Durant 610 Deluxe Sedan

The sad thing is they were built to run forever, but we threw them away when they were 3 years old.

Count Louis Zboroswski's original Chitty Bang Bang had a big engine, a 23 litre six cylinder Maybach aero engine. The car ended up in a junkyard, but there was no real-life Caracticus Potts to rescue it.

But Zb' built an even bigger one, "Babs" which used a US Army Surplus airplane engine, a 1918 V12 27 litre Liberty. [Engineered and built by Packard.] That's just about 1650 cu in. It used an obsolete chain drive Mercedes Benz running gear from 1908. It set a speed record, but a year later crashed while trying to defend it. The car was buried in beach sand for 42yrs, but then dug up and restored.

Do You own a car built by Durant? yes