frogmanjohn

Should i get the 081 or the 416 heads to use on my 305 tbi or is there a better one i might find in my local salvage yard? i found em both.

thank you,
john

Dewey316

they have exactly the same ports. They are the same casting, only one is perimiter style, one is centerbolt.

frogmanjohn

my questions are answered, thank you all.

azvolfan

Speking as someone who has done the swap you are talking about, get the 081's. I got the 416's and wish I had gotten the 081's. The 416's don't mate up nice to the intake. It will require some drilling out the four center bolt holes on the intake. It's doable but if you can get the 081 your much better off.

92blue

iTrader: (1)

That depends on your intake, not everyone is going to prefer the 081s.

azvolfan

well that's true. I was assuming that it would be an intake of similar bolt pattern. But if the intake is also changing, then get the one that will fit it best.

firebirdpl

does anyone know hot to modify the intake, i have a set of freshly rebuilt 416s with big valves and springs i had done up for my boat before the block cra cracked, and an edelbrock tbi intake i would like to use them.

azvolfan

I have 416 heads and just did the intake swap to an edelbrock intake. The usual ovaling out the 4 center bolt holes on the Edelbrock intake will not work. Don't do it!!! The plenum on the Edelbrock is a lot wider than the stock one and the center bolts can not lay back far enough to make it to the holes. What we did (this was James'[90_WS6_Formula] idea) was take a piece of screws all and cut it into about 8 inch (approx length) lengths and then screw it into the head and then bend it up to the proper angle. James actually did it with a blow torch while the 8 inch pieces were off the car. But it worked like a charm. The intake needed no boring out on the center bolt holes. I would recommend doing this to anyone who wanted to use the 416 heads and the Edelbrock intake.

frogmanjohn

well, i am allready running the edelbrock tbi egr intake, so i better go with the 081's then.

john

firebirdpl

can anyone reccomend an intake that can be used with tbi either a tbi intake or with an adapter plate that will work with the 416 heads.

Dewey316

any manifold that is designed for 86 or earlier SBC's will work with the 416s.

firebirdpl

but any specific type of manifold work better with tbi, single plane dual plane etc. that is what i meant.

Dewey316

I am rather fond of single planes with and adaptor.


but I am a little bias.

azvolfan

Dewey aren't you running the Weiand 7525 on your RS?

Dewey316

Yes Sir.