[Tyler Townsley]

I might as well interject a thought. While cavation could be a problem and is a known issue with the LT-5 I would contend that the bypass system is the root of the problem and much easier to solve.Mark is correct that the engine heat generated by rpms over 6100 rises faster than one in a racing environment can contend with, however this is due more to the fact the water ceases to flow through the radiator when the rpms pass 5800 or so rpms. In fact over 5800rpm the water is routed directly back into the block via the bypass which helps explain the dramitic increase in temp.

I do not have the skills to reengineer the bypass but I have tested in normal driving and at least one owner tested in racing the following.

1. Install a radiator that can flow at least 100 gpm.
2. Cut the thermo spring so that it is always open.
3. Block the bypass flow path with a plug.

I ran this configuration for over 50k miles with no overheating, in fact I had to block the radiator with cardboard in winter to have enough heat for the heater. This configuration was what Fastlane used in his car (it was he who told me this trick) and was tested by at least one roadracer with satisfactory results.

Tyler