L-Head motor?
Edit:
Willys model 441or 442 “Go Devil” 4-cylinder in-line water
cooled side-valve (L-head) gasoline engine, developing 60 bhp (54
net) at 4000 rpm and a max. torque of 105 lb-ft (95 net) at 2000
rpm Cubic capacity 134.2 in. (2199 cc). Bore and stroke 3.125 x
4.375 in (79.375 x 111.125 mm). Compression ratio 6.48:1. SAE
and RAC rated hp: 15.63. Firing order: 1-3-4-2. Valve tappet clearance
(cold) inlet and exhaust: 0.014 in. Spark plugs: Champion
QM2 or Auto-Lite AN7,14 mm, gap 0.030 in. Auto-lite ignition
distributor (dust-proof on certain vehicles); contact breaker gap:
0.020 in AC model AF mechanical fuel pump. Carter model
W0-539S downdraft carburetor.