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6.0 Lq9, small 224 cathedral cam with square port heads? Anyone running a 6.0 lq9 with a small cam like around a 224 for cathedral heads but with square ports? Or will the lq9 for a fact be better with stock 317 heads? Really wanting some real world experience knowledge if possible. |
Go read . Theres build threads everywhere |
Your gonna get several different answers, and lots of opinions. It’s a very debatable topic that really has no right or wrong answer. I’ll give you a real world experience example that I’m working on right now. I’m starting a build right now in my shop. Just got everything back from machine shop, and everything is together and ready to start mock-up. It’s a .030” over 6 liter block (LQ4) that will have GMPP LS3 CNC’d heads on it. Going in a 99’ Silverado 4wd ext cab, which is a heavy truck. We are looking for torque, and I had Tony Mamo spec the camshaft. It’s a 219/231 Comp hydraulic roller. Engine will never see 6500 rpm. This is not the first square port build I’ve done for torque, and I can make it work with the right parts. As Mavn said in the previous post, there are many threads about this subject. |
I see posts with cathedral heads and a cathedral 224 specd cam. Or square port heads and square port specd cam. I didn’t see a 224 specd cathedral cam with square port heads. I only found one that talked about a small square port cam with square heads. I’ll search again, I’d ask on fb but too bs there vs here |
The issue with square port heads is they tend to need more duration on the exhaust side, up to 12 degrees extra duration. A custom split cam would be best. |
Get a hold of a vendor like Steven from Cam Motion. He is very knowledgeable. I talked with him for a bit about this subject on Friday. He explained a lot about it for sure. |
Care to share any of the important info he told you? |
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