SPL311 Parts from Rallye Enterprises, Ltd.

Is your cap not sealing properly? This may be the culprit.
One thing that can help this part endure life is to be sure the little hose that runs from the thermo housing top plate to the rad is of VERY flexible light material.

Even the original hose is too stiff. The jockeying around of the engine and a too-stiff hose contributes to the plate fracturing or the piece on the radiator fracturing. I'd also suggest making the little hose longer; so it has a big gentle curve in it; this would also tend to reduce impacts when the engine rocks and the radiator stays still.

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