Anybody built a C5R 427 with C5R heads?

GRB · 04-25-2008, 10:48 PM

I know most 427s use LS6 or heads other than C5R. In particular the .090 heads which GM sent to a few dealers and racing teams. I would assume Katech experimented with the 090s too. The point is the 090 C5R head has a very small combustion chamber and could cause compression problems if used with the wrong pistons.

Anyone seen a case where this happened or have other experiences with 090 or similar C5R heads??

GRB · 04-30-2008, 11:31 AM

Try this. How much dish would the pistons have to have to get the comp. ratio down to run street gas? Any ideas? The ones I've got have about a 1/4" of dish. We are running static comp. checks now, but I'm just wondering if anyone else has run into this?

learning-vettes · 05-01-2008, 12:14 PM

I have a question on the Magnetic Selective Ride Control? Does anyone know what the difference is in a vet with that or the Z51 package? Does the normal driver need the MRC or will they be just as happy with the Z51? I was told that the MRC doesn't even come in to action until you hit 90 mph or more is that true?

GRB · 05-01-2008, 05:51 PM

I don't think that's true. Now, tell me what you know about C5R heads and their small combustion chamber.