My AFR 1388's match EXACTLY the Mr.Gasket 302 intake gaskets. ("Joey" recommended them. Said I had to see the flow numbers out of the box)
When I layed those on the C60A (no longer the T/A) the ports on the manifold were 1/8 smaller all around. That is a BIG difference.
I don't presently have a set of gaskets for the 351w 4v here. So I couldn't compare them. I would have no idea how anything would match up to the GT40 heads. I've only seen pics of them. Neither could I tell from pics that I saw if those ports were as cast or gasket matched to "something" else?
Again, I'm not arguing, just trying to learn now what was proprietary information back then.
When I first layed up the gaskets, I remembered thinking that the ports were the same size as the "Blue Thunder" 2x4. That one I port matched to the gaskets and I was running the 68-302 4v heads (massaged as they were).
The ports on that manifold after gasket matching them left very little on the top of the port to seal to the manifold. MAYBE 1/8"?
Since this C60A was virgin, I elected not to go there with gasket matching.
This is probably all just academic anyway? The car is not going to be vintage raced and as it stands will be fine on the street and open tracks.
There is no way I am going to race "hole shot" Gillis under any circumstances. I got the dimples out of the roof and I don't want them back.
Do you know what dimpling the roof sounds like in the driver's seat? It sounds like the car is one big oiling can. I was confused. Never heard anything like that before. Don't want to hear it again.
It had only occured to me that with out of the box flow numbers on those heads around 300 cfm @ only .500, how much of a mismatch the intake ports were.
I've done a few Edelbrocks port matching and if anything, I thought that was detrimental to the overall performance. I seem to recall a note in the box from Edelbrock saying "leave them alone!"
Now let me also say that the nearest "legit dragstrip" used to be Englishtown in NJ, but that was converted to something else. Probably a golf course like Bridgehampton was?
So the locals here, I need to be careful with. They are liable to report me as testing a vehicular battering ram intended to attack "protesters" with? They're kinda' funny that way. One guy threw a garbage can at me because he thought I was gonna' patch out in front of his house.
Wheel stands are absolutely out of the question.