![]() Then, in 1963, the smaller 153 tooth flywheel was introduced. Up until 1962, the ONLY size flywheel was the 168 tooth version. 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. 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 externally balanced ones fit the newer cranks that dont have the big flange and weight on the crank. The reason is because the starter bulge on a bell housing for the big flywheel is too small for the alum starter nose. The internally balanced ones fit the old cranks with the large flange on the rear that bolts to the flywheel. BUT, a starter with a staggered bolt pattern and an ALUM nose will ONLY work with an auto tranny flywheel (flex plate). 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. 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. The chips were just like cast iron powder. Have a graph-looking thing with dotes also.My 70 Z28 4-spd has the 168 tooth with the 621 bell. I have seen a few bellhousings with 80 in the circle these are obviously date codes. MOST of the lo-perf SB cars, such as a 283, 307, 327 2bl or 350 2bl, got the smaller 13in 153 tooth flywheel. Needs maintenance).There are one or two circles divided in half that areĮngineering codes and may contain some sort of date code. Many SB cars got the 168 tooth flywheel, and MOST trucks (BB or SB) got the 168 tooth flywheel. 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 Gen III, IV, V LS/LT series engines feature only the large diameter, 168 tooth flywheels, and flexplates, but carry either a 6, 8, or 9 bolt crank flanges. 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. 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 Hays 24-213 Billet Aluminum SFI Certified Flywheel, Ford Modular. ![]() Mounting hole size, clutch fork ball stud locations, z-bar mounting GM used engines fromīut, there are major differences to consider such as transmission 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 early bells were cast iron with the aluminum bells being phased in. 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 Flywheel Diameter (12. Most people define Chevrolet Bellhousings by the Clutch size (i.e.ġ0.5",11", or 12"). Most people define Chevrolet Bellhousings by the Clutch size (i.e.
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