This Intake Manifold Insulation was used all through the 1960s, and into the 1970s on big blocks, except hemi. It's not likely to
have been used on 440-6 engines, and it's not likely to have been used on mid-1970s-and-later high performance blocks.
Its purpose was listed in parts catalogs as "Valve Tappet Noise Reduction Silencer Package." Some say its real purpose was to
prevent the intake manifold from cracking due to heat. Some say it was only used on air conditioning cars.
Those who have observed many original engines have seen its two pieces tucked under the intake manifold.
It is POSSIBLE to install these exactly-reproduced pieces after your manifold is already in place, but it's much easier to do like
|the factory did. The pieces were placed on the pan, large piece in front, small piece in rear, then the manifold was bolted in. These pieces should have engine paint overspray.|
These silencers are a heavy aluminum foil filled with a fiberglass insulation pad. The foil is correct in size and shape. The pads are a pair that don't look like each other, nor did the originals. The edges of the pads are sealed correctly. Retainer not included.