318-3 Poly?

[BlackCSS]

Hi folks...found today,what is supposed to be a Poly 318-3. I am told that those engines came with hydraulic lifters. This engine has a sticker on the valve cover which reads "202HP",and the exhaust manifolds are ribbed. I did not have time,or a wrench to pull a valve cover to check. Anyone have any info on these engines? Thanks....

[wideblock]

the 202 hp stickers and the ribbed exhaust sounds like a LA block 318, not a poly. does it have the smooth edge on the valve covers or the fluted edges??

[BlackCSS]

The valve covers are fluted,and has the two bolts through the top,so it's a Poly for sure,and it also has an engine speed govener(sp?,oil bath air cleaner,and a two barrel. I will have to take my camera and snap a few pics.

[PwrWgnWalt]

Here's a quickie on the "Premium" 318-3 (poly):

................................318-1.................318-3........
Compr. Ratio:.........8.25:1...............7.50:1
Compr. Pressure:....120-160 psi..........90-130 psi
Timing:...................10` BTDC.............12.5`BTDC
Camshaft:.............chain................roller chain
Conn. Rod Journal:..2.124"-2.125"........2.1235"-2.1245"
Bearing clearance:...0.0005-.0015"........0.001-.002"
Bearing Material:.....babbit..............Tri-metal (ex. main brng #5)
Valves:..................solid stem............stellite faced
Valve Lift:..............0.380"................0.381"
Ex. Valve Rotator:..No....................Yes
Tappets (lifters):...Mechanical............Hydraulic
Ex. Vlv Spring:.......137-150 lbs...(open)..178-192 lbs
......Pressure.........49-57 lbs...(closed)..80-90 lbs
Oil Pump pressure:..50-70 psi.............60-80 psi
Oil capacity:...............5 qts..(less filter)..6 qts
Manifold heat:...........Thermostatic..........None

And there you have the differences! (Yes, the 318-3 has hydraulic lifters) Lower Compression, Higher pressure oil pump, exhaust valve rotators, different exhaust valves, more oil capacity, and "premium' bearings!

Hope this helps your quest...

PwrWgnWalt

[BlackCSS]

Thanks Walt! I am hoping that this is one of those Premium units. I have a bunch of the solid lifter ones,and was wanting to locate one to add to the pile. I will post at a later date with my findings.

[wideblock]

if it has the governor on it, you got a real good chance of it being a 318-3. the smaller trucks didnt have the gov, and the ones that did were all the big trucks that got the 3 series engine. good find. take the gov off and she will run tons better.