L36 with incorrect aluminum intake

[Andrew S.]

I recently bought a July-built '66 L36 that I had inspected by a Master NCRS Judge before purchase. The block #'s match, but were painted over during restoration, so he couldn't inspect the broach marks.

However, at some point in it's life, someone decided to put an aluminum intake on it. Here're my questions:

1) How can I tell (without taking it off...) if the intake is from an L72?

2) Were the aluminum intakes on the L72's able to just be bolted on to an L36 block? Would there have been some sort of perfomance advantage for doing so?

Thanks! I've also posted a question about broach marks in a different thread.

Andy

[Joe R.]

Re: L36 with incorrect aluminum intake

Andy,

The part number of the L-72 intake manifold is 3885069. The part number is visible on top. What is the part number on your intake? Can you post a picture?

As far as I know the L-72 intake would bolt right up to L-36 heads. Assuming that the rest of your engine is L-36 (cam with matching hydraulic lifters, oval port heads), I would think that the L-72 intake would have a detrimental effect on HP and torque.

Joe

[Duke W.]

Re: L36 with incorrect aluminum intake

The L-36 has oval port heads and the L-72 has rectangular ports, so there is a significant mismatch in port cross section when using an L-72 manifold on a L-36. Not a good combination - certainly worse than the OE L-36 manfold.

Duke

[Joe R.]

Re: L36 with incorrect aluminum intake

Andy,

Here's a couple pics of my L-72 intake.

Joe

[Andrew S.]

Re: L36 with incorrect aluminum intake

I'll take a harder look at my intake once I get home tonight to determine just what the heck it is

Are the attached photos of a correct manifold for an L36 without K19?

Part number looks right to me. Any opinions on the condition?

[John H.]

Re: L36 with incorrect aluminum intake

Andrew -

That's the correct 948 intake (cast June 30, '65), and the ends of the "hot-slot" have been plugged (saves you the trouble of doing it). Looks OK to me.