Re: Head Gasket Thickness for 1969 L-78 (375hp/396)???
I used the steel shim gaskets, and was very careful with my PTV clearance - after learning that the slugs are sunk in the holes further than one would think, there was no problem clearing the valves  If/when I redo this engine, I will get the heads cc'd and won't use the TRW's again 
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Marlin
70 Yenko Nova-350/360, 4speed M21, 4.10 Posi (Daddy's Ride)
69 SS Nova-396/375hp, 4speed M20, 3.55 Posi (Benjamin's Ride)
67 RS Camaro-327/250hp, 2speed Glide, & 3.08 Open (Danny's Ride)
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