I decided to cc 5 different cylinder heads that I have in stock to see how close they are to the advertised combustion chamber size.
The results may surprise you!
The 5 heads tested are as follows:
1. stock 862 casting 4.8/5.3
2. 799 casting rebuilt by Advanced Induction - 63cc as verified by them
3. stock 799 casting
4. milled 799 casting - supposedly milled .040"
5. Texas Speed/PRC Stag 2.5 243 casting
This test leads to more questions now... will a milled 799 perform as good or better than a 706/862 head?
We know from Richard Holdener's tests that the smaller cc 706/862s do better below 5000 RPM - but is that only due to the increased compression from smaller chambers? Or are there other factors involved?
That will be a dyno test for another day.
*** Grab a syringe like the one I used in the video here: amzn.to/3OpJQPg ***