08-01-2014, 09:04 PM
Just a quick one what notch do people get when they change there head gasket the one that came of has 3 and iam going to skim the head do people think I will need a 4 or 5 notch thanks
![[Image: mike_sig_zpsd438fb98.jpg]](http://s307.photobucket.com/user/rallymark1/media/306oc%20Forum/mike_sig_zpsd438fb98.jpg.html)
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Head gasket notches
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Posts: 19,854
Threads: 581 Joined: Dec 2011 Reputation: 195 Location: Bournemouth Car Model/Spec: Supercharged 306 GTi6 
08-01-2014, 09:05 PM
Normally you would measure (probably best to get the machine shop to do it for better accuracy) the head height after skimming then you can work out what HG you need from that.
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft 
08-01-2014, 09:59 PM
I think you have to measure the piston height from the deck
306 XUD9 gt2052s
306 hdi stage 2 (hdi tuning) 205 STDT -new project 
08-01-2014, 10:07 PM
Yup you measure piston protrusion and base it on that
However there is such a small difference in thickness that I just go with the thickest 5 notch these days. 
Posts: 20,092
Threads: 591 Joined: Nov 2012 Reputation: 54 Location: Cotswolds Car Model/Spec: Stage 13 16v HDi
08-01-2014, 10:13 PM
(08-01-2014, 10:07 PM)zx_volcane Wrote: However there is such a small difference in thickness that I just go with the thickest 5 notch these days. and still get valve/piston slappage! 
Wishes for more power...
08-01-2014, 10:25 PM
(This post was last modified: 08-01-2014, 10:26 PM by zx_volcane.)
08-01-2014, 11:45 PM
Thanks for the info I will prob just got for 5 as I don't want any valve to piston damage
Posts: 5,203
Threads: 110 Joined: Jan 2012 Reputation: 20 Location: Devon Car Model/Spec: Estate, DT, GTI6 and 205
09-01-2014, 08:24 AM
Let me know what you want to do mike and I can get a 5 notch sorted for you
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