Well guys, I have no experience in running stage II headed car on the street yet but I will by next year for sure. At this time I have no real numbers to tell you guys. I know a street car varies in definition for most people. Well in my book a street car is; driving to the shows, track and a pleasure drive on a Sunday morning and of course with ac and heat if needed)
I am willing to experiment with stage II heads. My combo is, on center block Stage II heads a 230/230 street solid roller cam, either 76GTS or GT42/76 turbo and AC driving about 1000 miles a season and see what happens. I have the stage II motor ready to go sitting on my engine stand. I have talked with people that have experience running stage II heads on a street car including Mac, Mike Licht and others. I came to the conclusion that I will no issues as far as running the stage II heads, we will see.
The other reason I went with stage II heads was; I got a nice pair of stage II heads, roller rockers, valve covers and misc for around $750. If I were to get GN1’s with all that it would be around 3K, so it was a no brainer. I was also discouraged by the GN1’s cracking ( the early one’s, I had a set) The valve guide issues and smoking. I know they have come a long way and the GN1R’s pretty darn good.
I know that you can accomplish a lot with GN1 heads, I have seen them deep into the 8’s To get the maximum power out of a stage II heads you need to run a bigger turbo than what you would use on GN1’s. In my case I am not looking to light the world on fire. My objective was price first then everything else.
Bison, I have a great deal of respect for you for what you bring to the table, you are asset to our community. With all my research I am with Mac on this one for my own sake
. We will see.
Just my $.02
Prasad