1FZ Cylinder Head Valve Differences 93-97

[mcv1998]

Was doing some research and found that the valves on the gcc spec/gen market 1fz heads have a different part number. does anybody know the differences off the top of their head? pic for reference. and no its not the carb version or coil pack version.



GCC spec valve

USDM Valve

 

[Fj80oregon]

@OGBeno whats your thoughts?

 

[bjowett]

The only obvious difference is the 13715-66020 appears to have a touch of back cut machine work done on the tulip. This would give possible flow benefits.

13715-66030

 

[OGBeno]

I’m assuming something to do with fuel quality in different regions.

Toyota had different valves for F/2F/3F engines for different markets with different fuel grades.

Otherwise, I’m sure there are other engineering reasons.

 

[GCCFZJ]

I’m assuming something to do with fuel quality in different regions.

Toyota had different valves for F/2F/3F engines for different markets with different fuel grades.

Otherwise, I’m sure there are other engineering reasons.

I went through this situation when I pulled my head.....ultimately I went with Ferrea valve's and didn't look back