Widening TBI intake bores

[Chewy1576]

I just picked up a complete big block throttle body for my 383. Comes with 65# injectors, adjustable fuel pressure regulator, IAC valve, and TPS. I need to widen the TB bores in my Edelbrock intake. Does anyone see anything wrong with using a gasket to locate the holes and using a hole saw to widen the bores to 2"?


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[skylark]

it will be a giant pain without a drill press because there is nothing to center the hole saw.

 

[Chewy1576]

I guess I could use the gasket to make a template out of a 1/2" thick piece of scrap wood and let that keep the hole saw from wandering?


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[TagAllen]

Machine shop!

 

[Chewy1576]

Machine shop!

That's Plan B if I don't feel comfortable drilling it out myself. I have access to a drill press at work too.


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[twomanymontes]

I would use a die grinder with a carbon bit. Place the gasket down, draw out the circle and grind away. Just be sure the intake is off the truck and you flush it out good before installing it.

 

[Chewy1576]

I would use a die grinder with a carbon bit. Place the gasket down, draw out the circle and grind away. Just be sure the intake is off the truck and you flush it out good before installing it.

Definitely getting the intake off the engine before anything! I don't want to destroy that year old crate engine by dropping filings down in the heads.

After doing some more looking around (by looking I mean Googling every variation of "big block TBI on small block" I could think of) the TB I bought is the later style with the bigger footprint. Because the Edelbrock intake has a raised mounting surface that matches the small block TB, I will need a spacer that matches the bigger TB to get it to seal. That spacer will work well for marking and/or boring the larger holes also.


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[Chewy1576]

Ordered adapter harnesses for the IAC and TPS. Just need to track down a spacer and I should have everything needed to do the swap.