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Hi Jason and Paul. Thanks for the info. Thats really useful to know. A little bit of water could creep past the silicone without marking it in the short time I had it running. Stupidly I didn't cheque the torque on the manifold bolts but they did come out rather easily. Despite having to do a...

Thanks for the responses but the car and engine are in a heated garage so no condensation.

Thanks for the response Colin. I forgot to mention that the head/manifold silicone gaskets looked ok but it has made me think about the integrity of the inlet manifold. The bores have got to be honed and new rings fitted which means a total strip down but I will think about pressure testing it...

2 years into a 40 Mark 1 build and two weeks before a booked a UK IVA test my engine decided it didn’t want to turn over very well. An internal inspection with an endoscope revealed water droplets on the pistons and rusty colouring around the top of all 8 bores. The engine, a 365 bhp 302 with a...