So, these "production GT1 engines in LMP1" then...
It seems you can have a bespoke 6.0 race engine running 32.5mm restrictors, or a 4 valve per cylinder homologated engine (eg. Aston V12) using 33mm restrictors, or a 2-valve lump (eg. Chevy C6R based engine) using 34mm holes.
Is this likely to make a Chevy engine a cheaper (yet as powerful) option than an off-the-shelf lump from Judd, Zytek or AER?
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