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 61 
 on: January 05, 2023, 07:21:51 pm 
Started by keri - Last post by keri
Hi Neromoto yes as i had to send the head to my machine shop for a new valve seat to be fitted they confirmed it has 9mm valves   so should be later series 2 valves thanks for all the advise it really helps.

 62 
 on: January 05, 2023, 03:38:16 am 
Started by keri - Last post by neromoto
If you are replacing a new intake or exhaust valve, check the stem diameter.
S1 and S2 have different stem diameters.

 63 
 on: January 04, 2023, 10:03:04 pm 
Started by keri - Last post by keri
hi thanks for that i think where i have misunderstood s1 s2 heads is the picture above shows a series 2 head but at glance it looked different to mine but looking again it still has the gasket attached so blocks off some holes, also the fresh air holes on series 1 heads  do i need to block these off on mine i assume not as the heads  that came off were not blocked and it all seemed ok.

 64 
 on: January 04, 2023, 09:49:05 pm 
Started by keri - Last post by keri
I think where I've misunderstood about the heads is the picture of the head above which is a series 2 must still have the old gasket attached as i can see more cooling holes in my head than i can see on that so thats why i thought they differed by the way the fresh air ports for s1 heads should i block these off on my series 2 or does it not matter as they were not blocked on the heads that came off.
thanks
Keri

 65 
 on: January 03, 2023, 11:16:27 pm 
Started by keri - Last post by inthedark
Keri,
The heads are the same it is just the gasket
that was updated with aids to cooling flow

 66 
 on: January 02, 2023, 05:08:04 pm 
Started by keri - Last post by keri
  thanks for the pictures of the head and gaskets but to confirm is the picture of the head defo series 2 as it has less cooling holes in it than the 4 heads i have here so I've assumed the series 2 head has more cooling holes than early head? and also the gaskets that came of mine are the same as the ones out of the packets on the pictures with more holes so are these gaskets series one or two just so i can order the correct ones.
thanks again for all your help

 67 
 on: January 02, 2023, 04:45:33 pm 
Started by keri - Last post by keri
excellent thanks for clearing that up  so does it matter when fitting these to an injection engine i don't think it does as both head types seem to have them from what i can see only reason i ask this is one of the replacements head i am going to use seems to have these holes blocked of with a hard substance which can be cleared if required.

 68 
 on: January 02, 2023, 10:22:56 am 
Started by keri - Last post by neromoto
Quote from: inthedark on January 01, 2023, 09:24:12 pm
Keri, the holes to the exhaust ports are for the series one emissions system
They trick the engine into adding fresh air to the exhaust gases, it reduces
the emission readings and. Causes the pop pop on over run.

 69 
 on: January 01, 2023, 09:24:12 pm 
Started by keri - Last post by inthedark
Keri, the holes to the exhaust ports are for the series one emissions system
They trick the engine into adding fresh air to the exhaust gases, it reduces
the emission readings and. Causes the pop pop on over run.

 70 
 on: December 31, 2022, 01:40:51 pm 
Started by keri - Last post by neromoto
Two types of gaskets.
The picture of the head is S2.

It is better to make your own gasket for the intake manifold than to use a kit.

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