[Healeys] Hardened seats in a cast iron 100 head

[Robert Markovich]

I would still  put in a lead additive. MDR Relead is no longer made but there are others. It’s cheap insurance. And yes, I would not add hardened valve seats because of the likelihood of cylinder head cracks as a result. The alloy heads come with those—at a steep price! 


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On Monday, August 26, 2024, 11:43 AM, Kees Oudesluijs via Healeys <healeys at autox.team.net> wrote:

 
In most cases hardened valve seats were/are not necessary. There was only a small handful of engines that gave trouble after introducing lead free petrol.
 
 Op 26-8-2024 om 16:43 schreef Bob Spidell via Healeys:
  
 
 My dad had our BN2/100M's head redone--valves, guides, etc.--by a local speed shop we trust (the machinist is a meticulous Kiwi who Dad said got really excited when he saw 'Weslake' cast in the head). Unfortunately, Dad isn't around to ask, but they almost certainly installed hardened exhaust valve seats; it's been SOP since, well, since lead was removed from gas. No issues, and I had it out on the road a couple weeks ago. 
 
 
 On 8/25/2024 7:44 AM, Michael Salter wrote:
  
 
I am still using cast iron heads on both my 100's. Amazingly neither have serious cracks as are so common on these. I am really picky and don't particularly like the different sound that a 100 engine with an aluminium head makes so would like to continue using these cast iron ones.  I'm contemplating installing hardened seats in one.  Hase anyone done this successfully?   
 
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