shaving the head

[64racing]

has anyone shaved a 93 saturn DOHC head before? if so how much did you take it down too? Is it possibly to do this even with a timing chain?
Thanks

[sierrap615]

from http://teamscr.com/racefaq.html

Shave the head – taking off 0.50mm will bump the ratio from 9.5 to about 10.2
Install the flat faced intake and exhaust valves from a 1991-1993 DOHC – this alone will bump the ratio +0.3


to me 50 thou is a litttle much, i would go with 0.030 to be safe. going over 0.040 starts to effect the timing i'm told, and i don't know the clearence of the valves to piston(remember this is a interference engine)

i can remember if the domed valves started mid-93 or in 94

[64racing]

Thank you sierrap615, anymore help or information about this would be great thanks again

[64racing]

do you think it would be worth doing? how much power would that add?

[sierrap615]

my understanding is it will give a slight to mild increase in power, most noticable at low RPM. if you are going to rebuild anyway, i would do it, in fact, i am going to do it with my upcoming rebuild.

[64racing]

someone was telling me it will screw up the knock sensor and it wont run right?

[sierrap615]

if you shave enough off and raise the compress you may have pre-ignition or detenation, in that event you would need to use a higher octane fuel