Chamber size vs bore size
10-12-2006, 10:52 AM
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Chamber size vs bore size Hello, I tried to search but search is down. I am trying to find out if the following setup would be a problem.
I have a stock bore LS1 out of a 02 Camaro. I purchased a used set of CNC ported heads from a local guy who had them ported by a top end porter in St Pete. The runners are 225-227cc. they have 2.05 int. and 1.6 exh valves. They were on a 408 and it look as though they had some port work in the chamber to unshroud the larger valves. I get 3.935 with a digital caliper measuring the width of the chamber from side to side across the valves. I would also venture to say that the extra porting in the chamber increased the cc's. They were also just recently freshened up and received a 10thousands mill. On the side of the heads reads 64.6cc. So after milling they ended back at the stock cc for a 243 casting.
My question is, will the larger size chamber(3.935) vs the stock bore(3.898) present a problem even thogh the cc's are back to 46.5. I assume the compression should be around 10.4-10.5 like a ls6. I just don't know if the wider chamber is a bad thing.
Also should I consider milling them some more to bump the compression or possibly run a .040-.043 head gasket.
The cam I am going to be running is a Comp XER 232/236 .595/.601 114+4.
I wonder what my DCR will be and also need to check PTV.
Mike
I have a stock bore LS1 out of a 02 Camaro. I purchased a used set of CNC ported heads from a local guy who had them ported by a top end porter in St Pete. The runners are 225-227cc. they have 2.05 int. and 1.6 exh valves. They were on a 408 and it look as though they had some port work in the chamber to unshroud the larger valves. I get 3.935 with a digital caliper measuring the width of the chamber from side to side across the valves. I would also venture to say that the extra porting in the chamber increased the cc's. They were also just recently freshened up and received a 10thousands mill. On the side of the heads reads 64.6cc. So after milling they ended back at the stock cc for a 243 casting.
My question is, will the larger size chamber(3.935) vs the stock bore(3.898) present a problem even thogh the cc's are back to 46.5. I assume the compression should be around 10.4-10.5 like a ls6. I just don't know if the wider chamber is a bad thing.
Also should I consider milling them some more to bump the compression or possibly run a .040-.043 head gasket.
The cam I am going to be running is a Comp XER 232/236 .595/.601 114+4.
I wonder what my DCR will be and also need to check PTV.
Mike
