I have an A15 with a GX/competition head in my '59 Austin Healey Sprite. It has had at least one valve job before and the head was resurfaced at that point and may be resurfaced again this time as well (if it needs it).

My question is this.....by milling the head do I need to shim the valve springs? What should the installed height be?

I am fitting new SI valves (30mm & 37mm) and I also have new GX springs, retainers, etc. that will be going on it and want to make sure everything works as it should when all is said & done.

Any help would be great. I've done a lot of searching here and on Google and can't seem to find what I am looking for. Sorry if this is a stupid question......the machine shop guy asked me and I had no idea what the answer was.

Thanks.