Chevy R07 Aluminum Heads will fit on a small block. They've got about $10,000 in machine work and parts and labor, over $1500 in the valve train alone, they cost about $2600 each direct from GM. Which leaves about $3300 in CNC machine work. These are the cylinder heads that were purpose built by GM for NASCAR Racing.

Titanium Intake valves : 2.180 head x 5.980 long x 6mm stem weighs 73 grams
Titanium Exhaust valves : 1.6325 head x 5.735 long x 7 mm stem weighs 63 grams
These come with valve seat locators, polished PSI valve springs & mini top lock titanium retainers.
Approx Spring Rates: 200 lbs @ 2.00 in, 575 lbs @ 1.250 in
They have been fully CNC machined and ported, Intake port: 1.730" x 1.985"
They flow upwards of 375CFM and can handle up to right around 12,000rpm.

I acquired these in a trade and the data above is what the previous owner gave me.

I live in Golden, Colorado and would prefer a local trade or sale around the Denver area.

$3500 sale or trade.
Contact via PM here or email me at jorjohnso@gmail.com

 

 

These will make for an amazing build! I hope you don't have to hold on to them for too long, but hopefully the post here will help move them along!

 

I do still have these.