78 3.0l vibration isolator orientation

[juanbenae]

looking to get my weber 40's set back on my motor and do not recall the orientation of the intake gaskets & vibration isolator cut out. please see the pic below and let me know which one is right. with the cut out in the intake of the head i do not see enough mating surface area to align the isolator cut out with it. tia

[Flat6pac]

You dont have CIS insulators. They should have extra fiber to cover the injector recesses in the heads.
Looking closer, those are MFI insulators...and a little small for your application.
Bruce

[juanbenae]

bruce, i dont follow. they are isolators for a 3.0L with carbs as far as i know. they've been in play for a few years since the 40's came aboard. the intake diameter on the isolaters is the exact same size as the gaskets for carbs i got at parts heaven today.

when you say small i assume you mean port hole size?

[BURN-BROS]

You need CIS insolators...not MFI insolators. Contact PMO to get the right insolators. Let them know what port size you have and that you have CIS heads.

EDIT: You need PMO CIS manifolds in order to match the CIS ports to the Weber carbs....Regular manifolds may seal but the probability of a vacuum leak will be high.