6.0 Lq9, small 224 cathedral cam with square port heads? - LS1TECH - Camaro and Firebird Forum Discussion

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6.0 Lq9, small 224 cathedral cam with square port heads?

 
Old 12-21-2018, 08:41 PM
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Default 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.

Last edited by LS1 pwrd NOVA; 12-23-2018 at 06:28 AM.
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Old 12-22-2018, 12:46 PM
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Go read . Theres build threads everywhere
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Old 12-22-2018, 03:39 PM
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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.
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Old 12-23-2018, 06:07 AM
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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
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Old 12-23-2018, 11:06 AM
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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.
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Old 12-30-2018, 10:38 PM
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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.
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Old 12-31-2018, 07:41 PM
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Care to share any of the important info he told you?
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