Reply to "anyone have vintage engine compartment photos to share?"

The J heads are nice and thick on the exhaust ports.

The casting number on the GT40 heads is C6FE. I know it looks like an 8, but there is no such thing.



I am sorry to say that I only document my projects recently since I got the Sony SLR. I don't have pictures of my heads to show you.

What I did was match the exhaust ports to Mr.Gasket exhaust header gaskets and blend back into the port. The pockets above the valves are enlarged, the exhaust bump is taken out and the valve guides are cut down and blended back.

I did cc them before and after and without my notes in front of me want to say that they were 80cc's stock and 115 finished.

Both intake and exhaust are a very significant improvement over the original castings.

I'd like to say that they look like these GT40 exhausts but that might be wishful thinking?

I did cc both the intakes and exhausts. Those numbers are in my notes. The intakes wound up at 210cc's.



The J intake ports need a little gasket matching at the edge.

Both pockets need work in the bowls. Similar to what the racers do to the Boss heads. The volume of the J heads is too small at that point.

The Windsor heads, all of them, are like the SB Chevy heads in the sense that race flow on them is in the area of 250 on the intakes and 120 on the exhausts. Getting near that created a lot of iron dust from the die grinder on my workbench.



To go larger on any small block heads, you are wasting your time unless you add cubic inches.

I think the 302TP's are a good example of that?

When the engine was still a 302, I ran a set of worked '69 351w heads. They were shaved .020.

Very disappointing. Saw a hp loss across the rpm range.



331's work really really well at high rpm. Boss 302 heads like the combination.

347's do very very well too, but are not really 8000 rpm engines. Not for very long anyway? What you build all depends on how you want to drive it?


I haven't seen Mangusta headers listed by anyone in a long time. Chances are it would be the Byers Bros who would make them for you. I'm pretty sure they have the jigs for them?

I'm told that Wilkinson, Hall and PrecisonProformance are all down the street from each other.

I'd start with Precision first for headers, even if I had to wait for them to build them for me. They, I believe, are the source to all of the other vendors headers?

If you install 1.60 exhausts, you need 1-3/4" od tubes.