How can you tell if a head is off a 5E? We got 2 16v heads at the shop, not sure what they're off of though. They say S43 on them, only number I can see. They are DOHC, one cam gear, intake cam runs off a gear on the exh cam. Evenly spaced exhaust ports. I can't tell if they are off a 4AFE or a 5EFE.