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Old 11-21-2005, 01:02 PM   #1
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boring out edelbrock 3704 tbi manifold

ive been searching on this topic and i see mixed answers about boring out this intake to 2". can you do this without running into water jacket? ive seen pictures on this site showing it done but others say differently. could the castings vary and some are ok and others are not ok?

thanks
dewayne
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Old 11-23-2005, 10:59 AM   #2
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Yes it can be done. Search under my user name for "boring Edelbrock TBI intake a success".
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Old 09-15-2010, 11:03 AM   #3
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Re: boring out edelbrock 3704 tbi manifold

I bought a used 3704 and I'm not sure if it is bored out or not

I'm taking my block to the shop this coming up Monday and if i don't need to take my intake that would be great. I used measuring tape and it measures 2 inch across (50mm) but i have a feeling its not due to the fact that i lack some tools to properly measure it.

here's a picture

http://www.postimage.org/image.php?v=TsS2EYS

Let me know what you guys think
Thanks

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Old 09-15-2010, 11:57 AM   #4
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Re: boring out edelbrock 3704 tbi manifold

that is not 2". closer to 1.687-1.750".
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Old 09-15-2010, 12:29 PM   #5
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Re: boring out edelbrock 3704 tbi manifold

I didn't think it was thanks for looking. Should I go 50mm or 47mm I'm using stock tb.
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Old 09-15-2010, 01:49 PM   #6
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Re: boring out edelbrock 3704 tbi manifold

If using using the stock tbi, leave it alone. Unless you think you might want a bigger throttle body later. Then u might want to bore it while its off.
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Old 09-15-2010, 02:27 PM   #7
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Re: boring out edelbrock 3704 tbi manifold

I read somewhere on here that the stock 3704 bores are smaller than stocks. If it won't matter with stock tb then there's a dime I saved. Thanks
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Old 09-16-2010, 04:37 PM   #8
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Re: boring out edelbrock 3704 tbi manifold

I had mine bored out and I'm still using the stock TBI. It won't hurt anything.
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Old 11-29-2010, 10:12 AM   #9
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Re: boring out edelbrock 3704 tbi manifold

Just had mine bored to fit a 50mm throttle body and it went into the water jacket...luck that I bought a used one to try this on. Work was done by a reputable machine shop.
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Old 11-29-2010, 10:15 AM   #10
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Re: boring out edelbrock 3704 tbi manifold

Just had my Performer TBI bored to fit a 50mm throttle body and it did go into the water jacket.....Work was done by a reputable machine shop. Luck that I bought a used one to try this on.
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Old 11-29-2010, 10:57 PM   #11
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Re: boring out edelbrock 3704 tbi manifold

Quote:
Originally Posted by sharpeningman View Post
Just had my Performer TBI bored to fit a 50mm throttle body and it did go into the water jacket.....Work was done by a reputable machine shop. Luck that I bought a used one to try this on.
Hmm. must be casting core shifts or something? two said okay and one said not okay...
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Old 11-30-2010, 06:39 AM   #12
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Re: boring out edelbrock 3704 tbi manifold

I dont think that u will actually need bigger bores and TB unless u want a big motor producing more than 300hp to the crank people say the stock TB with ultimate tbi mods will support up to 280 hp going bigger on a stock 305 or 350 tbi is just not worth it unless u want more horses than what the stock unit will support, i really dont see the point in the E. Performer TBI since in my opinion its a copy of the stock one that came on the engine already, im sure they flow pretty much the same.
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Old 11-30-2010, 10:05 PM   #13
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Re: boring out edelbrock 3704 tbi manifold

I might do this when I have my motor out and tore down when I eventually do the heads and stuff. But until then im going to order my 2" adapter to manifold and run the holley tbi and see what it does.
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Old 12-01-2010, 09:30 AM   #14
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Re: boring out edelbrock 3704 tbi manifold

how can there be a water jacket on the top mounting flange ???? I'm a machinist and don't understand this one.... at MOST you are only taking out .156 thousandths of an inch around the existing bores (holes) ?????????
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Old 12-02-2010, 06:22 AM   #15
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Re: boring out edelbrock 3704 tbi manifold

Quote:
Originally Posted by sharpeningman View Post
Just had mine bored to fit a 50mm throttle body and it went into the water jacket...
Could you post a pic?
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Old 12-02-2010, 06:50 PM   #16
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Re: boring out edelbrock 3704 tbi manifold

A PIC OF WHAT ?
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Old 12-02-2010, 07:37 PM   #17
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Re: boring out edelbrock 3704 tbi manifold

Of where the boring went in to the water jacket. I'll post a pic of my manifold tonight when I get off of work. Mine works just fine, thinking about selling actually. I haven't fully decided.
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Old 12-02-2010, 07:57 PM   #18
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Re: boring out edelbrock 3704 tbi manifold

HA OK, IT WAS'NT MY INTAKE THAT GOT MESSED UP, JUST CURIOUS HOW IT COULD GO WRONG. SORRY FOR THE CONFUSION . ROCK ON !
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Old 12-03-2010, 04:30 AM   #19
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Re: boring out edelbrock 3704 tbi manifold

Quote:
Originally Posted by 88 z28 View Post
HA OK, IT WAS'NT MY INTAKE THAT GOT MESSED UP, JUST CURIOUS HOW IT COULD GO WRONG. SORRY FOR THE CONFUSION . ROCK ON !
Can't you see"
Quote:
Originally Posted by sharpeningman e:
Just had mine bored to fit a 50mm throttle body and it went into the water jacket...
" in post #15 on your computer?
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Old 12-03-2010, 04:30 AM
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