how much can i shave the heads before it causes too much interference. turbos round hear are rare and i'm looking for something to add some pep to my ea82. my sedan is going to become a secondary vehicle so i don't mind reliability issues.
this is going to be something for my dad and i to pull wrenches on so....its mostly for kicks and giggles.
any thoughts would be great tnks
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Guest Message by DevFuse
can i shave the heads?
Started by
pheonix165
, Feb 22 2007 12:04 AM
6 replies to this topic
#1
pheonix165
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Eat, Live, Breath Subaru
- victoria bc (canada)
Posted 22 February 2007 - 12:04 AM
#2
daeron
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Cunning Linguist
- West Palm Beach
Posted 22 February 2007 - 12:43 AM
how much can i shave the heads before it causes too much interference. turbos round hear are rare and i'm looking for something to add some pep to my ea82. my sedan is going to become a secondary vehicle so i don't mind reliability issues.
this is going to be something for my dad and i to pull wrenches on so....its mostly for kicks and giggles.
any thoughts would be great tnks
I am not a sage, but my understanding is that you cannot shave the heads enough to really make an appreciable difference before your intake manifold no longer fits. :-\
I *may* be wrong, but I don't think so.
#3
GeneralDisorder
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Elite Master of the Subaru
- Portland
Posted 22 February 2007 - 02:58 AM
.020" for the manifold to still fit stock. .025" or even .030" if you drill out the manifold bolt holes a size over (no big deal).
GD
GD
#4
baccaruda
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YOUR FAVORITE MOD
- SpoVegas, WA
Posted 22 February 2007 - 09:24 PM
a valve job would be good as well (while the heads are off) or perhaps instead of the shaving...
#5
Phizinza
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Yip yip
- South Australia
Posted 22 February 2007 - 10:51 PM
Wouldn't that offset the intake port on the head to manifold and cause a disruption in air flow and pretty much screw up all the improvements you have tried so hard to do?025" or even .030" if you drill out the manifold bolt holes a size over (no big deal).
Or am I off with the fairies again?
#6
Prospeeder
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Subaru Fanatic!
Posted 23 February 2007 - 12:46 AM
not to mention the ports then wouldnt line up and coolant would pour out into the intake.
#7
GeneralDisorder
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Elite Master of the Subaru
- Portland
Posted 23 February 2007 - 03:29 AM
Go take a look at a feeler guage and then visualize taking that thickness out. For reference, even .030" is less than a spark plug gap. So no, it doesn't matter.
.020" is *technically* the max if you go by the FSM. But many have done .025, and .030 with just a slight oversize of the manifold bolts.
GD
.020" is *technically* the max if you go by the FSM. But many have done .025, and .030 with just a slight oversize of the manifold bolts.
GD
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