Titanium – with Funny car pedal , blow back tabs , Quad bolts (4 – 3/4″ cornerbolts), and magnesium spacer to move release bearing slightly further into transmission area, studs for lenco bolt pattern |  |
Material :
– Aluminum (yes there is still some out there)(* no longer certifiable )
– Steel Thin (* no longer certifiable )
– Steel with aluminum inspection cover (* no longer certifiable )
– Aluminum “new style“
– Steel with steel cover and clearance hole cover
– Titanium with all titanium components including bolts | 
Steel – 8 5/8 with FC pedal – covers are not aluminum
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Depth:
– stock – this is lakewood style stock , usually curved on top to fit door cars
– less than 8″ really old – but still out there
– 81/8 ” – these may be re certifiable for multi disc clutches – usually 2 disk
– 8 5/8 ” – most common today 3 disk alcohol some 4 disk fuel
– 8 5/8″-converted to 9.4″
– 9.4 ” Fuel multi disk | 
Stock style Note: shown is with removable
bottom and is no longer approved
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8 5/8″ converted to 9.4″
Note: spacer plate between engine and front of bell housing, and spacer with large internal hole so release bearing actually sits in front pocket of cannon to achieve enough clearance for 4-5 disk multi-stage clutch |  |
| Note: (right) cross shaft has also been moved further away from center – to clear moving clutch parts and provide better geometry for fork and release bearing wide clutch fork to allow bearing to sit between arms – for additional clearance |
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