Then, in 1963, the smaller 153 tooth flywheel was introduced. Up until 1962, the ONLY size flywheel was the 168 tooth version.
BB CHEVY168 FLYWHEEL.....WHATSIZE BENDIC MANUAL
So, you need a staggered bolt pattern starter with a cast iron nose which is what came on all BB/4sp cars and SB cars with the 168 tooth manual flywheel. Up until 1962, the ONLY size flywheel was the 168 tooth version. For the smaller, 153 tooth flywheel or flexplate, it's not an issue. For the smaller, 153 tooth flywheel or flexplate, it's not an issue. Thus, only the cast iron starter nose will fit into a big bell housing. The reason is because the starter bulge on a bell housing for the big flywheel is too small for the alum starter nose. BUT, a starter with a staggered bolt pattern and an ALUM nose will ONLY work with an auto tranny flywheel (flex plate). BUT, in your specific case, ONLY a starter with a STAGGERED BOLT PATTERN AND A CAST IRON NOSE will work!! That is, in regards to a stock type starter, NOT an aftermarket mini starter.Īny starter with a straight bolt pattern will work with a 153 tooth auto or manual flywheel.Ī starter with a CAST IRON nose and staggered bolt pattern will work with either an auto or manual 168 tooth flywheel. Exception is some trucks use 6 bolts on one pattern. A 6 bolt hole pattern on the flywheel where the converter attaches just means that two different converter styles will bolt up, because 3 holes are one pattern and the other 3 are another. Have a graph-looking thing with dotes also.My 70 Z28 4-spd has the 168 tooth with the 621 bell. The 153 tooth starter has the bolt holes straight across, and the 168 tooth has them in a diagonal pattern. I have seen a few bellhousings with 80 in the circle these are obviously date codes. Needs maintenance).There are one or two circles divided in half that areĮngineering codes and may contain some sort of date code. Molds and dies to help with quality control(as in number seven cavity Aluminumīells? I saw discussion on a forum that the single number over the part # But, there are variations in the starterĭate codes: Most cast iron bells have an alpha numeric code. Inspection covers: I've found three different sizes for aluminum bells.ġ53 tooth, 168 tooth and truck. Places on the inside (starter hole, fork hole) with the outline of trans Paint: Most Chevy bellhousings I've come across were panted whileĪttached to the engine and transmission, and have over-spray in various On the 168 tooth bell, the starter is farther away from the crank center line and therefore needs more room in the bell. Engine Size: 6. In the above photo you can see the difference between the starter sides of the two aluminum housings. Provisions, starter, clutch fork hole location and, of course, factory Mounting hole size, clutch fork ball stud locations, z-bar mounting We never saw anything coming up from the hole that we could say was the rest of the BB.
We ended up reaming it with an undersized 3/16 reamer and pressing a 3/16 dowel in the hole to take the place of the BB. I expected the other half of the BB to pop out at some time but nothing ever did. GM used engines fromīut, there are major differences to consider such as transmission The chips were just like cast iron powder. With that said, most Chevy bells will physically fit Small Blocks fromġ955 on up, 6 cylinders from 1963 on, and all Big Block engines, WĮngines, as long as they are Chevrolet engines. Eventually aluminum became the only material for all factory bells. The test is to mount the starter on the flat plate that goes between the block and bell housing without the bell housing and check its engagement with whatever flywheel you end up with. The early bells were cast iron with the aluminum bells being phased in. The number of teeth is not as important as how far aft the ring gear is on the flywheel. That a 11" clutch and pressure plate will fit.Ĭhevrolet has always had just two sizes of flywheel: Big (168 tooth 14"ĭiameter) and Small (153 tooth 12.75" diameter), with the 153 tooth Multiple bolt patterns, and the aftermarket makes a 153 tooth flywheel Teeth is more accurate because some 168 tooth flywheels are drilled with Flywheel Diameter (12.75" or 14") or number of Most people define Chevrolet Bellhousings by the Clutch size (i.e.ġ0.5",11", or 12").
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