Professional Products lists the years for this type damper line as being 1984-1995 and is a 6-3/4 diameter damper. This damper uses a timing cover that has the tab welded on at about the 12 o'clock position.
There were many weird one-off combos in certain applications. It is at the 12 o’clock position- or 40 before the keyway. Very common on late 70s engines like 305s, most commonly with 6-3/4" balancers (often called 7" balancers) and the timing tab that matches it can be seen by looking straight down behind the water pump and is welded directly to the face of the timing chain cover. Some timing covers (like Speedways 910-11040) have a thin groove, and others are thick. Less common is a balancer with a TDC line that is 45" CCW from the crank keyway. The matching timing tab can be viewed from the front of the engine sticking out underneath the driver's side "leg" of the water pump. The most common type of balancer has a TDC line that is about 10* CCW from the crank keyway (as viewed from the front of the balancer). Billet frame and stainless pointer.easy to add to stock timing covers that dont have timing mark or cover modified to run. So I'll just stick with what I know (which probably applies to your 72). Earlier engines (67 and earlier?) use a different tab and different position for the line on the balancer. This is a very simple and easy conversion for your build. You can use your factory timing cover, although you will need to use a freeze plug to block off the opening for the water pump drive. My experience is only with 70s vintage and later SBC engines. All you need to purchase is a cam core for your year model of LT1/LT4 and then use a timing set for a 87-01 roller cam SBC. Now, the balancers differ pretty much only in the position of the timing line scribed on the outside edge of the balancer. Qiilu Sbc Timing Cover, CNC Aluminum Timing Sbc Polished Timing Cover for SBC 283 327 305 350 383 400 Engines. In other words, if piston #1 is at TDC the keyway in the crank is pointing exactly 45* CW from vertical (as viewed from the front of the engine). These differences net different expansion and contraction rates, which can cause a shearing effect and lead to failure. This cover was equipped with a crank sensor, so the additional room may be to make room for the crank position sensor rotor. Every SBC has the crank keyway pointing exactly at the #1 crank journal, regardless of which balacer you choose. Some differences are: The plastic cover has more room around the crank gear.
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