i'm interested in putting a performer rpm air gap on my 89 firebird with tbi and a factory power bulge hood and have a few questions.

1) edelbrock's site only shows one for 86 and earlier engines. what's involved in fitting them to 87 and newer (non-vortec) heads?

2) it doesn't have a provision for egr. can one be added? does egr just go straight into an intake from the fitting, or is there internal plumbing for the egr cast into an intake that is egr ready?

3) how about the height? the edelbrock website shows this:

performer: "a" 3.50" "b" 4.60"

performer air gap: "a" 3.72" "b" 4.92"

performer rpm: "a" 4.20" "b" 5.25"

performer rpm air gap: "a" 4.20" "b" 5.25"

performer tbi: "a" 3.70" "b" 5.10"

it also says the performer tbi is .250 taller than stock.

i'm kinda puzzled by the performer tbi dimensions. the difference between the "a" and "b" dimensions is pretty extreme. why is the tbi angled forward so much more tha carbs?

does anyone have the "a" and "b" dimensions of the factory tbi intake?

 

hey, guys, i need some help here!

 

there is a picture of an external egr on here somewhere on a previous post, man i wish i could remember...

 

Yes, the intakes are angled ("A" and "B" not equal) because the engine is tipped, and you ideally want the carb (or TBI) to shoot downward.

 

You don't need or want the RPM for your 305. The performer is more than enough. It will run better for your setup than the RPM. It also comes with an EGR port so you don't have to get an under carb adapter plate. The performer is usually the same hgt as a stock carb intake. So it should fit your hood I would think. The RPM may not. You have to drill out the two center hole to get them to line up on a pre 87 intake. I believe a 87 up performer is available. So no drilling necessary. The TBI intake is a direct bolt on.