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Forum: Pontiac - Race 08-11-2022, 11:08 AM
Replies: 46
Views: 3,343
Posted By bignate
Oh absolutely not… if I do end up using these...

Oh absolutely not… if I do end up using these heads on something they will get all new good valves.

Nate
Forum: Pontiac - Race 08-10-2022, 07:45 PM
Replies: 46
Views: 3,343
Posted By bignate
Just cleaned up one of the tips of the intake...

Just cleaned up one of the tips of the intake valves and sure enough there is a hand etched DS #. Exhaust valves are production pieces not sure if those were replaced when the valve & guide job was...
Forum: Pontiac - Race 08-09-2022, 10:25 PM
Replies: 46
Views: 3,343
Posted By bignate
Pretty sure it’s just a scratch… one head was...

Pretty sure it’s just a scratch… one head was laying on top of the main caps of the block in the loft of the barn. I’ll look closely tomorrow and grab some more pictures.

BTW Paul, I’ll be...
Forum: Pontiac - Race 08-09-2022, 08:45 PM
Replies: 46
Views: 3,343
Posted By bignate
Other pictures.

Other pictures.
Forum: Pontiac - Race 08-09-2022, 08:43 PM
Replies: 46
Views: 3,343
Posted By bignate
Dug into these a little farther tonight. ...

Dug into these a little farther tonight.

Exhaust crossover is cast blocked off, not filled or welded.

There are several bolts screwed through the deck against other passages and surfaced...
Forum: Pontiac - Race 08-09-2022, 11:03 AM
Replies: 46
Views: 3,343
Posted By bignate
Yes the picture in #6 was one I grabbed from...

Yes the picture in #6 was one I grabbed from Rocky’s for sale add on here of an unmolested (except for the obvious repair) head.

Nate
Forum: Pontiac - Race 08-08-2022, 07:58 PM
Replies: 46
Views: 3,343
Posted By bignate
Numbers stamped on center exhaust ports. Nate

Numbers stamped on center exhaust ports.

Nate
Forum: Pontiac - Race 08-08-2022, 07:54 PM
Replies: 46
Views: 3,343
Posted By bignate
No paired rocker stud bosses on these. Nate

No paired rocker stud bosses on these.

Nate
Forum: Pontiac - Race 08-08-2022, 07:53 PM
Replies: 46
Views: 3,343
Posted By bignate
Ok just doing a quick cc job using a plate and a...

Ok just doing a quick cc job using a plate and a graduated cylinder I’ve come up with:

Chamber: ≈75cc
Intake port: ≈200cc

I say approximately but I’m sure it’s within 1cc either way.

I...
Forum: Pontiac - Race 08-08-2022, 01:27 PM
Replies: 46
Views: 3,343
Posted By bignate
I’m going to get these cleaned up and cc some...

I’m going to get these cleaned up and cc some chambers and ports this week. I would like to get them on a flow bench at some point too, just for curiosity’s sake.

After I get them cleaned up I’ll...
Forum: Pontiac - Race 08-08-2022, 07:49 AM
Replies: 46
Views: 3,343
Posted By bignate
Yes right on the ledge at the gasket surface. I...

Yes right on the ledge at the gasket surface. I thought maybe it was done by whom ever did the port work.

Nate
Forum: Pontiac - Race 08-07-2022, 11:21 PM
Replies: 46
Views: 3,343
Posted By bignate
Do you remember where the stampings were? There...

Do you remember where the stampings were? There is a # starting with ES stamped on the center exhaust ports on these.

Nate
Forum: Pontiac - Race 08-07-2022, 10:08 PM
Replies: 46
Views: 3,343
Posted By bignate
They for sure have had a bunch of work done… I...

They for sure have had a bunch of work done… I was told by the previous owner it was done by Diamond-Elkins in the late ‘70s.

Just going by a measurement off the lower accessory hole (I know it’s...
Forum: Pontiac - Race 08-07-2022, 01:14 PM
Replies: 46
Views: 3,343
Posted By bignate
191/7 Round Ports with small chamber

I just picked up this set of ‘71 455 HO heads and trying to decipher what I’m looking at. They do not have an external date code. I have not cc’d the chambers yet but will soon, and I’ll report back...
Showing results 1 to 14 of 14

 
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