Re: intake sealing
Cork ones just get me angry! and always start leaking.....although plenty of people hear have success with them. They are called valley cover gaskits.
I too prefer the big bead of silicon, rest the manifold on top, tq it as mentioned, then let it set for 24hrs and trim off excess. Make sure you use a good engine parts cleaner to prepare the metal surface for better bonding (not degreaser).........spray on a clean rag and wipe it over.
Whilst on the topic, I also use a silicon bead around each of the ports on my intake manifold gaskits. Poor sealing ones allow engine oil to be sucked up into the ports. Some come wth a built in bead.
393 Tremec TKO 9"