Best head
Started by
_fishfaceman_
, May 18 2009 04:52 PM
10 replies to this topic
#1
_fishfaceman_
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Posted 18 May 2009 - 04:52 PM
If you have a choice between a red 9 port head and a blue 12 port head for a 202, is there any reason why someone would choose the red 9 port head, in terms of performance.
#2
_Squarepants_
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Posted 18 May 2009 - 04:53 PM
Do a search, plenty of info on this already.
9 ports can be hogged out further to give better flow, 12 ports are better standard/mild application.
9 ports can be hogged out further to give better flow, 12 ports are better standard/mild application.
#3
wot179
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Posted 18 May 2009 - 04:55 PM
Best head?
Kind of expecting more.....
Kind of expecting more.....
#4
Heath
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Posted 18 May 2009 - 05:00 PM
The 9 ports are a lot better to work on etc, including simple things like putting hardened valve seats in.
The 12-ports are rumoured to be very prone to fracturing, which relates to Spongebob's post above lol
But yeah for flat out pushing the boundaries of Holden 6 performance, most tuners opt for a 9-port I think, because you can take the ports out so far
The 12-ports are rumoured to be very prone to fracturing, which relates to Spongebob's post above lol
But yeah for flat out pushing the boundaries of Holden 6 performance, most tuners opt for a 9-port I think, because you can take the ports out so far
#5
_fishfaceman_
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Posted 18 May 2009 - 05:10 PM
So if I'm thinking of getting my red 202 worked I should stick with the original head instead of buying a blue or black head.
#6
_fishfaceman_
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Posted 18 May 2009 - 05:11 PM
Best head?
Kind of expecting more.....
I needed to get peoples attention somehow.
#7
GML-31
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Posted 18 May 2009 - 05:42 PM
bit of a let down, a topic by fishfaceman about head and its really about a head
#8
_Herne_
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Posted 18 May 2009 - 05:46 PM
bit of a let down, a topic by fishfaceman about head and its really about a head
LOL
PMSL It did get attention though......Herne
#9
debkar
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Posted 18 May 2009 - 05:53 PM
Or you could use 9 port red converted to 12 port, old mod using aluminium dividers
#10
Heath
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Posted 22 May 2009 - 10:58 PM
If you want a mild 12-port head, you're much better using a Holden 12-port rather than making your own.
Unless you are really concerned about making your motor look original for the car or something, I don't see much point in installing the dividers; in a really hi-po application, you're not gonna benefit from it a huge amount, and in a mild application, the late model heads are a better shaped port than what you can make out of a 9-port anyway.
But yes, good on you for bringing it up because I forgot that practise.
Unless you are really concerned about making your motor look original for the car or something, I don't see much point in installing the dividers; in a really hi-po application, you're not gonna benefit from it a huge amount, and in a mild application, the late model heads are a better shaped port than what you can make out of a 9-port anyway.
But yes, good on you for bringing it up because I forgot that practise.
#11
debkar
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Posted 18 July 2009 - 10:23 PM
If you want a mild 12-port head, you're much better using a Holden 12-port rather than making your own.
Unless you are really concerned about making your motor look original for the car or something, I don't see much point in installing the dividers; in a really hi-po application, you're not gonna benefit from it a huge amount, and in a mild application, the late model heads are a better shaped port than what you can make out of a 9-port anyway.
But yes, good on you for bringing it up because I forgot that practise.
Hey Heath,
Benefit of being wrong side of 40 years old , have tried all the holden 6 options, and sometimes can remember some of them.
Yes , old school conversion still holds it's own. especially with correct manifold and triple dual throat carbs.
I still use head with the conversion,
combustion chamber of the same head, before recent freshen up
Regards Simon
Edited by debkar, 18 July 2009 - 10:29 PM.
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