what valves to use 1g head

[RocCitySlayer]

Assuming that they are perfectly straight and not cracked or anything, would you say that they would be ok in a build with the goal Im aiming for?

 

[spoolin ddub]

I will forever stay with Ferrera valves on any of my builds from now on. I used Super-Tech's for many years, and this past year I had pistons contact the head. They broke off and took out the pistons.

This could have been just a manufacturing defect which could happen form time to time on any part. This is what I've found. Most say run Supertech due to the inconel exhaust valve which is great against heat. Specifically Supertech uses Inconel Alloy 751. The thing that confuses me as to the reason most say to run inconel and what most don't seem to know is that Ferrea competition exhaust valve is made out of Super Alloy and Inconel is in the Super Alloy family ....but Ferrea Super Alloy is Nimonic 80A based material and is a grade higher than Inconel. Supertech exhaust valve material is rated at 1800*. The DSM Ferrea Super Alloy exhaust valve material is rated at 1850*.

 

[rhamlinii]

I guess, I'd never expected them to hit or are they designed for that. However, after looking at the aftermath. I felt had they bent, before they broke. It would have been far less damage. I then went with a different brand the cost more, to prevent that from happening if ever again. 3000.00+ dollars worth of damages at start up. Not reving it, or racing it. It only broke in one cylinder, but touched on them all. My opinion, are based off of what happened to me.

 

[dexterholland04]

I've only ever run engnbldr or Manley valves. Both are fine.