what will I need to swap in a holley intake?


ps: Are underdrive pulleys a good mod?

 

youll need a tbi spacer so the egr will fit. i have the holley pro jection intake and its a nice intake, but the egr location is a tad too close to the tbi and the egr wont fit under the tbi without a spacer under the tbi. underdrive pulleys are a nice mod.

 

id skip the u-drive pulleys if it primarily sees street use. Might cause problems with the alternator and cooling at low rpms. As for the holley projection stuff, there have been issues about the location of the tbi being different and causing problems hooking things up. A carb intake and an adapter might be a better route. I think PAW makes a good adapter from what i hear.

 

I loved my Holley Pro-jection intake. I would still be using it on my 383 if it weren't for my vortec heads.
I had egr turned off in my chip, and used a block off valve so no spacer was needed.
The only other mods to make the manifold work are minor and easy to do. You would need to use them if you were using a carb manifold as well, so it's not a big deal. There is only one vacuum port on the manifold, where as the stock manifold has two. All you need to do is use a "T" connector. Also, the coolent line to the diverter valve is in the front of the manifold as opposed to the rear. I had to modify the throttle bracket slightly as well.

On the other side of the table, a carb manifold w/ an adapter will cost less as well as be useful if you ever want to swap to a 4bbl tbi or carb.

I recommend the crank underdrive pulley if you can find it for a reasonable price. I ran the crank and alternator pulley until my alternator died while I was staging. Needless to say no more alternator pulley....

 

Do the manifolds still maintain the proper relations? I read awhile back of someone having trouble getting one in.

 

Mine fit perfect, it was the 300-66 for '87-up cast heads. Never leaked or anything either. It could be the person was using the wrong one for his year heads.