One step forward and two steps back

[johnnydog]

There are some interesting technical articles available on Chris Witors website regarding the head applications for all models, and also the flow rates for the 219016 head.

[Binny]

Hi Alec,

As far as I know PI engines up to MG 50000 had the 516816 head with 32 mm dia exhaust valves. Both my cars are Mk2 with engine numbers in the MG 1800 to 2100 range so think my donor car will have one of those although I’m going to check this afternoon.

[Binny]

I’ve read the info on Chris Witor’s site regarding cylinder heads - it’s very informative, thanks Johnny Dog.

I think I might contact Chris to see if he can point me in the right direction as to which head and valve springs I should use.

[Binny]

I can confirm that the head on my original 71 pi is a 516816 with double valve springs. Also the height of the head is 3.45” which is the same as the 219016 head.

[Binny]

I’ve just heard from Chris Witor and he recommended using the 219016 head but reducing its height to 3.4” and using the double valve spring set up as used on the original pi head.

So it’s off to the machine shop