You would need the stamped number suffix code from in front of the cylinder head to know the original application. I have a 348 from a 1960 Pontiac that decodes as 348, 250hp, turboglide. The only difference between Chevy and Canadian Pontiac to my knowledge is the Canadian Pontiac doesnt have the bow tie stamped in the valve covers.

Big Bear wrote:

---

I had a 2x4 intake that was suppose to come from a 64 Pontiac. Unlike the one in the add my intake had a grommet for a PCV instead of the road draft tube.   Did'nt think they had a tube in 65.

---

 What is the tube at the bottom left of the distributor that drops down by the oil filter

The more I look at the picture of the road draft tube the more questions. I think all the car engines had the draft tube down the passenger side to allow room for the automatic transmission kick down linkage. I think that road draft tube is from a truck. Just be aware that the big truck 409 will have the same block casting numbers but will have the block notched to lower the compression ratio. No way to know without pulling the heads. With truck pistons in a truck block I think gives 7.75 compression ratio. With aftermarket pistons I think you could still get 10:1 with a truck block. 

Paul

Use a 454 crank to create a 496 c.i.d W-motor. It has been done.

The 1965 409s are unique and rare animals. Numerous 1-year (1/2 year?) only parts, like exhaust manifolds.

Shown below is a '65 409 with correct manifolds.