Could we see the sonic map?

How do you get that out of this:

"According to my records, some of the late truck engines had pressed 1.04 WP's."

That's all I said. Are not FT engines, also FE's?

I said some truck engines and I didn't even say all truck engines. It was just a statement of fact. It appears that not many knew that.

According to my records, some of the late truck engines had pressed 1.04 WP's.

With a std size rod bearing in it, add 2.439 + .975 together, devide by 2 = 1.707.

Measure between the 2 bearing holes, with calipers and add the 1.707 and that will give you the approx length. The dist should be ~4.781 for a 6.488 rod.

Did you mean the head gasket is a 8554 PT FelPro?

I ran your numbers using a standard Scat/Mahle 18cc piston (H beam rod piston) with 0.00 deck clearance and 65.5cc heads and only got 10.36 CR with the 8554 gasket. They are 12.7cc.

With your, 70° IVC, it puts you at 7.95 DCR, a bit out of the 92/93 oct gas range for your 280 cam, you could try reducing the lash to .018. That will give you a little later IVC and see if that helps any.

If you change cams, you'll need to go to at least a 284 duration on a 110 ICL. A custom cam something like a 284-6/294, 114 LSA/110 ICL with mild lobes. Howards has lobes that would fit nicely in that range.

I ran a few number and you will need at least a 22cc piston dish to get it in the pump gas range.

A better estimate can be done if we know the deck clearance, head gasket and what ever the piston cc is.

Here is my take on it:

Based on what he did with the C1 heads and what Steven Magnotti did with the C8-H heads, I would say that your in the 270-275 cfm range, at best.

270 cfm is about the best you can expect from OOB Edelbrock 2.09/1.65 with a good VJ.

So, it's only a weight issue for those but, you can pick up a lot of hp with TFS or Blair built BBM's.

I would try to find someone to flow your heads and see what you actually have. Please report back if you do.

I had to abandon my .309 valves because they were no longer in stock with my valve supplier and would have to wait 4 mo to get them.

I was going to run them with 11/32, 1.75 ex valves, to match in/ex weight, so, I had to buy both at 11/32 and have them drop to Jay so, he can drop ship them to Blair, with the heads, for his 7 angle valve job.