Actually the Police package engines are kind of special. Just about everything internal to them has been upgraded for longevity and HD use. I have a '88 Police 318 in my '65 Formula S and love it. There were also 360 Police engines but not many. If anyone is interested these are the specs and info I've been able to accumulate on these engines:
Police sedans were equipped with a high performance 318 engine, which was equipped with 360 heads and a 4 bbl carburetor (Thermoquad through 1984, Quadrajet from 1985). The earlier ('80- '84) heads have a 4027596 casting number and a cast-in "360" on the top of an intake runner. It has an open combustion chamber with a volume of between 66 and 72.5 cc. The valves are 1.88"/1.60" and the ports are large, averaging 65cc on the exhaust side and 149cc on the intake side. Note how similar the volumes of these heads are compared to the performance heads of the early 1970s. Police engines are equipped with flat top hyperutectic pistons with no valve reliefs. Calculated compression ratio is 8.4:1.
Beginning in 1985, police sedans were equipped with a different 360 head, 4323345, with larger pushrod holes, 11/16" in diameter, instead of 1/2" as found on all earlier heads. The larger pushrod holes are to accommodate hydraulic roller lifters, which were introduced in 1985 (my '88 version is still flat tappet). The chamber is open and its volume is slightly larger than the earlier 360 heads, 69 to 77 cc. Port sizes are very similar to earlier heads, and the larger pushrod hole does not narrow the intake port relative to the earlier heads. These heads also have 1.88"/1.60" valves. Because the piston pin height is 0.020" greater, the calculated compression ratio is similar to earlier engines, even though the chambers are larger. It has been suggested that the 345 heads are a swirl port design, but the port and chamber shape is indistinguishable from earlier heads.
(AHB police package on options plate, E48 or ELE engine code)
Rated rear wheel HP 175 @ 4000 rpm, torque 250 ft lbs @ 3200 rpm
318 CID (block casting #4323330 85-89 flat tappet) with special kolene cleaned 360 cylinder heads (casting # 4323345), special 1.88 silichrome-1 high tempature steel intake valves, 1.60 nimonic exhaust valves, heavy duty valve springs, high strength rocker arms, high temp cylinder head cover gaskets, high temp valve seals and shields, 360 four barrel intake manifold, heavy duty exhaust manifolds, double roller timing chain, hyperutectic pistons (flat top w/o valve reliefs, piston pin height raised 0.020 due to 360 open chambers (approx 74cc), 8.5 to 1 compression ratio), special piston-to-block clearances (allowable by use of the hyperutectic pistons), heavy duty chrome plated oil rings, forged steel connecting rods, lubrite treated camshaft (4bbl hydraulic version had 340 cam: 430/444 lift with 268/276 duration, roller version had 391/391 lift with 240/240 duration) windage tray and a heavy duty water pump (large bearing). (Specs from Dodge, Plymouth & Chrysler Police Cars 1979-1994 and the Allpar website + others).
