porting tb opening while on engine?
Thread Starter
Staging Lane
Joined: Dec 2015
Posts: 56
Likes: 0
From: Killadelphia
porting tb opening while on engine? Any safe way to go about opening the TB ports from 48mm to 58mm while still on the engine? Really dont want to pull the manifold if I dont have to. But if thats the best way to go about it, then of course I will pull it...
TECH Veteran
Joined: Apr 2008
Posts: 4,985
Likes: 112
IIRC the stock intake manifold opening is 54mm. you really don't want to shave off that much metal while manifold is installed on motor...shavings WILL get into motor
You can buy a 52 or have the stock TB bored to 52 (preferred) and just leave the intake manifold alone.
You can buy a 52 or have the stock TB bored to 52 (preferred) and just leave the intake manifold alone.
TECH Addict
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
Who does the TB boring?
On The Tree
Joined: Apr 2013
Posts: 179
Likes: 0
From: Utica, IL
I have been looking for someone too. There was a pretty good listing on ebay in 2014, but it does not look like they do it anymore. It is a shame too because it sounds like a stock TB bored to 52mm operates better than any of the aftermarket ones.
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I donw mine back in the day on the car. Shoved some shop rags in the intake and used a shop vac to pull all the shavings out. Never had a problem
On the throttle bodies, What did they previous guy charge? Any idea where he got the butterflies? We have a machine shop, it may be something we look into
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Thread Starter
Staging Lane
Joined: Dec 2015
Posts: 56
Likes: 0
From: Killadelphia
Yea I picked up a used 58mm TB with all sensors included on it for 80$ so I am not complaining. I just was seeing if I could do it without pulling the manifold. But it looks like I am going to pull the mani and paint it also. Thanks for the help guys. Oh one last ques, whats the best type porting bit to go about using to port it open?