![]() ![]() Also, if the oil holes in a full-groove-type setup are aligned exactly (oil hole in the bore saddle and oil hole in the cam bearing), oil pressure can potentially feed-back, momentarily preventing oil from traveling around the journal, which can minimize the necessary oil wedge. From 1977 to 1982, M-block (351M/400) engines were a mainstay of Ford light truck powerplants. This more efficiently creates an oil film between the cam journal and its corresponding bearing. ![]() However, even if a full-circumferential groove is present, as we mentioned earlier, it is necessary to position the cam bearing's oil hole at a specific position (at approximately the 2:00 position as viewed from the block front) in order to allow cam rotation to create a slight oil "wedge" during operation. ![]() Blocks and heads using a 360 °oil groove located behind the bearing oil feed. By comparison, the '92-97 Chevy LT1/LT4 features a full-circle oil groove, which might lead you to think that exact clock position of the cam bearing oil hole is not important (since oil will feed into the space between the bearing and cam journal and will travel along this groove, eventually feeding into the bearing's hole anyway). (The illustration shows the optimum engine oil feed hole location for a camshaft that is turning clockwise as viewed from the front of the engine.) Maximum camshaft support will be realized by installing the cam bearing oil feed hole to the optimum clock location. used with crank sprocket 464617 and cam sprocket 340235 Timing chain, double row. As a case in point, earlier small-block Chevy blocks might feature only an oil-feed hole that aligns with the main cap oil passage, in which case the cam bearing's oil hole must align with the saddle's oil hole. Balancer, 1969-80 350 ci Chevy V - 8, all W / S / H / P, 8 in. ![]()
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