Gotta use the head ID code on the exhaust center ports to confirm it.

Looks like "16" maybe? In '69 there was no ID code that started with a 1, so your '70 theory may be working here. In 70 they cast a, 11, 12, 13, 15 and 16.

Go here to verify:

Pontiac V8 Cylinder Heads

My guess is it is a '70 (cast in '69) #16 head.

 

Gotta use the head ID code on the exhaust center ports to confirm it.

Looks like "16" maybe? In '69 there was no ID code that started with a 1, so your '70 theory may be working here. In 70 they cast a, 11, 12, 13, 15 and 16.

Go here to verify:

Pontiac V8 Cylinder Heads

My guess is it is a '70 (cast in '69) #16 head.

Thx: Makes sense....

August would typically mean it is the following year production. New castings typically start in July, so August should be 1970 BUT, never assume because it is possible that it may still be the1969 #16 head right at that transition date - Pontiac is known for not following their own rules. So I would just pull a valve cover and see if you have screw-in studs or press-in studs to verify what you have.

Thx Jim....looks like further investigation is in order.

ANOTHER QUESTION:
"Assuming" it is the 1970 head: According to the Wallace Racing chart, 1970 had 2 type 16 heads:

400	290HP	16(sm valve)	1.96/1.66	10 c.r.
400	330HP Big Car	16	1.96/1.66	10 c.r.

I don't understand the 16(small valve) reference for the 290HP listing.
It appears to me that both sets have identical size valves.

Why the difference in HP (290 vs 330)?
Was it possibly due to carburetion.....2BBL vs 4BBL ?

 

August would typically mean it is the following year production. New castings typically start in July, so August should be 1970 BUT, never assume because it is possible that it may still be the1969 #16 head right at that transition date - Pontiac is known for not following their own rules. So I would just pull a valve cover and see if you have screw-in studs or press-in studs to verify what you have.

 

Carburation, cam, & exhaust manifold style could account for the HP difference, for sure. That "sm valve" reference is funny since the valve dimensions given are the same...Hmmmm?

 

Apparently the #16 heads made in '70 did have smaller 1.96/1.66 valves and press in studs.

Some info in the forum link below. I'd do what Jim says and pop a valve cover to see if threaded or press in

#16 Heads - PY Online Forums - Bringing the Pontiac Hobby Together

#16 Heads 68-69 GTO Tempest & LeMans TECH

forums.maxperformanceinc.com

 

Apparently the #16 heads made in '70 did have smaller 1.96/1.66 valves and press in studs.

Some info in the forum link below. I'd do what Jim says and pop a valve cover to see if threaded or press in

WILCO....thx. Your link was a good read.

So mentioned some changes. Are you planning to keep the 350? If so, the 16 heads may be a good platform to be pump gas friendly on a 350 block. If they are the press in stud variety, have a machine shop install the threaded studs, a bigger cam, could be a spicy build with the right cam. Looks like you already have RA manifolds.

Not a lot of LeMans builds on here, and even less LeMans Sports. Nice looking car!

Thank you.
I plan on keeping the 350. I hope to modify the motor for moderate/dependable performance. Nothing crazy, just a smooth everyday pump gas cruiser. I'll be back to this forum often asking for recommendations/suggestions/direction.

To show you exactly what I know about Pontiacs (I was a FORD Blue Blood - 1970 Boss 302), I had no idea that those manifolds were/are RA Manifolds. What identifies them as Ram Air?

 

So mentioned some changes. Are you planning to keep the 350? If so, the 16 heads may be a good platform to be pump gas friendly on a 350 block. If they are the press in stud variety, have a machine shop install the threaded studs, a bigger cam, could be a spicy build with the right cam. Looks like you already have RA manifolds.

Not a lot of LeMans builds on here, and even less LeMans Sports. Nice looking car!

 

There is a lot you can do with a 350. Don't go too crazy with the cam shaft and you should have a fun street car. The ram air manifolds look way different. They are basically cast iron headers and flow about the same as tubular shorty headers. They are perfect for a street application. No need for full length. There are quite a few guys on here running the RA manifolds on large displacement engines.

Here's what the std "log" style Pontiac manifolds look like:

 

Thx @Jared .
Looks like I need to knock the rust off of mine....

@Sick467
Just FYI: I sent an email to John Wallace (Wallace Racing) and asked about the 1970 #16 heads reference to 'small valves'. His rather timely response was:
"They are the same head. (both should say small valve)
Just different hp between the 2 listings."
So that clears that up.