solo_ryder wrote:Yea, the kl31 1a1 heads have a tendency to drop valves. The KL01 cams are alright, if you can find a set of kl31's then bonus, but the car is still gonna be fast!
For as many ZE that are out there, there isn't really that many instances of dropped vales. Broken retainers are really only a concern forthose who abuse (over-rev) their motors. However, there are much less reports of dropping valves on KL01 ZE's, it's theorised that they have stronger retainers than their KL31 counterparts, but it couldn't hurt to upgrade them either.
As previously mentioned, a KL01 cammed ZE is typical of it's curved-neck varient, while the KL31 cams are usually in the straight-neck ZE. It's extremely rare, but there are a few instances of 01 cams in a straight neck. It's quite possible that the intake manifolds have been swapped, but you never know.
Plus I've started taking the heads off anyway so now is the time to do it right! I guess I'm one of those instances then, who knows what the japs get up to with these engines 