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What size allen wrench for inside vacumn advance diaphram? Mopar Performance small block dist

If the cam manufacturer calls for a spec for valve adjustment with the engine HOT, how many thousands difference is there when its cold? I know the gap closes some when hot but how much?

I already know the answer. In the picture below, when the marks are lined up as shown you can then install the distributor aimed at number 1 on the cap. True or False

Are W-2 rocker shafts the same size (outside diameter) as factory shafts?

I found 4 part numbers that fit small and big blocks.

I need 8 offset roller rocker arms for T/A heads but can only find them listed for W-2.

Has anyone ground thru into the coolant passage during porting J heads and where are the areas that are closest to the coolant passage?

Are all 340 X heads T/A heads and are all T/A heads X heads?

What is the minimum compressed valve spring spec for use with roller lifters? I want to run a roller on the street but want the lifters to last. .600" lift , max 7000 RPM