Do your own headwork?
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Joined: May 2007
Posts: 73
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From: Woodlawn VA
Do your own headwork?
I ordered a set of base casting l92s and from looking at all the pics of the ported/cnc l92s there is alot of casting flash and little imperfections from the factory. Would it hurt anything if i polished out the exhaust ports? I know the intake cant be mirror polished or anything cuz of the fuel building up on smooth walls hurting performance, but would it hurt anything if I got rid of the casting flash/buildup in the intake runners? Has there been anyone with the juevos to go as far as port thier own heads 
, if so please advise.
, if so please advise.
Safety Car
Joined: Jun 1999
Posts: 3,570
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From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
A while back, I pulled the head off my 1996 Corvette LT4 with the intention of porting them. After removing the valves, I concluded I really had no clue what I was doing so I sent them to a professional to clean them up and get them pocket ported. Its also a good idea to remove the valves while they are getting ported because all the metal fillings and get the valves ground and lapped to make sure they seal. I got them flowed to see how much of an improvement it made. I picked up 22 rwhp as a result. It cost about $500.
Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
You may think its OK just to do a touch up and remove the flashing, but you need to remove the valves. If you do that, you are bound to nick a valve seat when you do, so it will need them re-ground. A 5 angle valve job can pick up quite a bit of flow at low valve lift.
In my opinion, either don't touch them or send them to a well established professional to get them done right and flow tested.
In my opinion, either don't touch them or send them to a well established professional to get them done right and flow tested.
