<Ul> <Li> All T engines utilize a timing chain and have a cast iron block with an alloy cylinder head with hardened valve seats and a hemispherical combustion chamber design (HEMI). </Li> <Li> All T engines are carburated except those with electronic fuel injection, "E" designation . </Li> <Li> All T engines use a 2 valve OHV design except those with a DOHC performance head, "G" designation . </Li> <Li> The 12T / 13T has a sub-cylinder directly behind the spark plug that leads into a smaller chamber for emission purposes . </Li> </Ul> <Li> All T engines utilize a timing chain and have a cast iron block with an alloy cylinder head with hardened valve seats and a hemispherical combustion chamber design (HEMI). </Li> <Li> All T engines are carburated except those with electronic fuel injection, "E" designation . </Li> <Li> All T engines use a 2 valve OHV design except those with a DOHC performance head, "G" designation . </Li>

What is the b in the toyota corolla