Originally Posted by
danmw2003
I dont need any information. The calculations should have been done during the build planning phase of your project, prior to installation. Everything needs to be measured with a degree wheel and your chambers volume to do all the math required to see where your CR is at. If I had to guess your CR is around stock 10.5 ish and probably should be closer to 12.0:1 for that cam. But to get to 12.0:1 CR there's piston to valve clearance issue you have to deal with along with the volume of the aftermarket heads you put on it. A lot of variables there to account for, and no way to really know without measuring and documenting everything. The tune can be perfect, but wont make any compression to bring your power up. Compression is your best friend for NA cars, and should be a focal point during planning. Most people dont do any of this and just slap parts on because of what they read on the internet, and or whatever salesman they talk to, tells them at their chosen speed shop retailer. Again no pun intended, so dont take any of this the wrong way. Just my humble opinion and obviously, just another keyboard warrior here, but I think you'd have much better results with a smaller cam.