951carter

get an 87+ head, they changed the ceramic liners to make them more durable. It is cheap to get the intake ported, and you should be able to find an 87+ head pretty cheap if you look hard enough.

highboost951

Howdy Russ! ...I still haven't messed with the cylinder head yet...anyone else?

TonyG

First off, not having a ceramic exhaust port liner will have zero effect on the longevity of anything other than possibly the heat transmitted to the head.

All serious 951 race engines, are done using a N/A core.

Don't think that you can get the proper port dimension and shape by removing the ceramic liner. You may be able to, and then again you may not be able to. I have no idea of what it looks like with it removed, nor do I know the thickness of the liner at all points along its length.

It's a crap shoot, but it looks like there's nothing to lose by doing so.

If it were me, I'd remove the liners, then take the head to a professional porting/cylinder head shop that is capable of porting the head properly. Having the proper tools, and more importantly, the experience to know what the port needs to look like is of utmost importance. Failure to do the job correctly, will for sure result in useless head.

Get a pro to port the exhaust side after you've removed the liner (taking as little aluminum off in the process).

Good luck,

TonyG