Senior Tech Team
Join Date: Sep 1998
Location: Mustang, OK USA
Re: 1968 327 PCV system
ALLLLLLLLLLLLLLLLLLLLLL 68 small block engines DID NOT have the hole in the rear of the block for crankcase ventilation.
IT IS POSSIBLE, ALTHOUGH, EXTREMELY UNLIKELY, THAT ANY VERY EARLY 68s HAD LEFT OVER 67 ENGINES WITH THE HOLE IN THE REAR.
AGAIN, POSSIBLE, BUT EXTREMELY UNLIKELY. The reason is specifically because 68 is the year that crankcase ventilation changed from the rear of the block to the valve covers and that configuration would have been the same for all engines at the beginning of 68 production.
As I commented elsewhere, I personally have seen and owned a 68 327 that had the boss in the rear of the block for the crankcase vent hole, but it was not machined, now was there a boss on the underside of the bell housing flange which would be required to machine a hole for the passage into the rear of the lifter valley.
Therefore, beginning in 68, on all small blocks (BBs began in 65), the crankcase/PCV setup was accomplished with holes in the valve covers. Also, 68 was the LAST year for an oil filler tube at the front of the intake manifold. The 69s got an oil cap in one valve cover (BBs always had an oil cap in one of the valve covers).
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