I’m tinkering with the 95 22RE and wondering if anyone knows if the W16EXRU Denso spark plugs are the same dimensions as the W20EXRU? I have NGKs in it now, so don’t have a W16 plug to compare the W20 to. I believe the W20 and W16 Denso’s are identical aside from heat range. So yeah, just an off the wall question about dimensions. The NGK plug o have is just slightly shorter than the Denso W20. I don’t wanna put this W20 in and smash my piston. Although unlikely I’d assume…. Let me know. Thanks YT

 

The specs between the 16 & the 20 seem exactly the same, so no danger of bashing pistons.
https://www.densoproducts.com/denso-...ove-spark-plug
https://www.densoproducts.com/denso-...ove-spark-plug

And you're right, only difference is heat range (16 vs 20): https://www.densoproducts.com/heat-r...ersion-chart-2
The lower the heat range number the hotter the plug.