lt1 58mm intake porting ??
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From: mesa,arizona
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From: mesa,arizona
i got the tb for a real good price its just sitting in a box ready to be installed so im going to install it on sunday thanks everyone for all your answers i appreciate it
Stock bores are 52mm not 54mm.
With that said its pretty stupid to open them up with the intake on the car considering how easy it is to pull it off. All it takes is a couple shavings to get past the rags to trash your shortblock, and I really don't think saving 30 minutes of work is worth the risk. Not to mention you can do a much better job with it off the car.
Hell I had an intake ported a couple years ago by a popular head porter and it was still full of aluminum shavings. If I didn't check it I wouldn't still be running a stock shortblock.
With that said its pretty stupid to open them up with the intake on the car considering how easy it is to pull it off. All it takes is a couple shavings to get past the rags to trash your shortblock, and I really don't think saving 30 minutes of work is worth the risk. Not to mention you can do a much better job with it off the car.
Hell I had an intake ported a couple years ago by a popular head porter and it was still full of aluminum shavings. If I didn't check it I wouldn't still be running a stock shortblock.
Please back this statement up with some facts, like how does this happen when there isn't anything being changed FUEL WISE with a TB swap??? if you did some tuning you might end up moving your TQ curve I guess but seriously dude its not a carb....
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well i took my time and prepped everything b4 i started porting the intake it came out very nice no shavings got passed the oil rags if you take your time prepping everything will be alright but thanks for the input tho guys i will post pics when i get them off my camera
Pics! 
I assume you used a dremel or air bit? Thread Starter
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yes i used a dremel i dont have air at home 
i just took my time soaked the rags with oil taped up everything plugged the inside holes with ear plugs and went to town wit the dremel it took a little longer then i expected but it wasnt bad 
i just took my time soaked the rags with oil taped up everything plugged the inside holes with ear plugs and went to town wit the dremel it took a little longer then i expected but it wasnt bad 
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Yea I ported 2 upper TPI plenums, both I did siamesed TB bore but I used air and it still was time consuming heh
Wonder why no one does siamese intake 'runners' on the LT1 manifold like people did on the TPI base :\ Meh dumb idea, just thinking aloud lol
Wonder why no one does siamese intake 'runners' on the LT1 manifold like people did on the TPI base :\ Meh dumb idea, just thinking aloud lol
If your car is still a 350 there is no need for a 58mm tb. a 52 is just fine for stock cubes.
If you do decide to port the intake please take it off or just trash a motor for 20 mins worth of work.
the floor of the intake is acually lower than the heads so gasket matching just makes the angle too miuch.
If you do decide to port the intake please take it off or just trash a motor for 20 mins worth of work.
the floor of the intake is acually lower than the heads so gasket matching just makes the angle too miuch.
read the bfranker page and it tells about the 58mm on a stock motor. it does help
I got this information from Ed Wright. He had dyno tested this on his 383 and stock cube motors. I trust what he says and was tring to help others.
