Quote:
Originally Posted by 1badchevelle
Nice project looks like you know what you want. I do have a question why ls6 heads and not the l92?
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I love answering this question. To be honest, I aquired the LQ4 with the intentions of running L92 heads, but one heck of a deal came across my plate and I had to take it. The heads without valve springs only ran me $650 shipped and I already have the springs, locks and retainers I was going to use on the L92s. They were also recently redone and milled for a smaller chamber, which is a must on the LQ4 with dished pistons to bring up the compression ratio.
Here are the technical reasons that made the final decision for me.
1. The valve size on this head is only 2.0" as opposed to the giant 2.16" valve on the L92 meaning I can run a much more aggressive cam before running into PtV issues.
2. The runner volume is 30cc less than L92s meaning more port velocity and more torque, especially on an engine that might not have the highest compression ratio in the world. Or cubic inches. This is a street car after all.
3. They flow within 10 cfm at peak and 5 cfm everywhere else of the stock L92s. I will be giving up a few peak HP in trade for more torque, but I will make up for it with the camshaft.
4. My LS6 heads will use my stock rockers that I already have. If I had a larger budget I'd get the needle bearings replaced, but I'm just going to have to sit on this one. They checked out good during inspection anyway. No need for offset rockers that L92s need.
5. Did I mention that they were $650 shipped?
-Nathan