I'm currently rebuilding a C20LET to put into my Calibra and will be ording parts for it very soon to begin rebuilding it. Most parts will be std GM parts (ie water pump, belts, bolts etc), I intend to fit Phase 3.5, aqumist, porting on the head and balance/lighten crank/flwheel.
Now GM have a gasket kit, and I want to know is it worth going for a standard C20LET gasket or the steel Z20LET gasket? Will this fit correlty on my head/block (COSCAST head)? Also what are the benifits of fitting an uprated gasket?
I've done a search on prevoius posts, some people have uprated steel ones, but these are quite expensive, is there anyhting wrong with the std or Z20LET headgasket? The Z20LET sounds like 1.9mm thick where the C20LET is bout 1.1 to 1.3mm thick.