Just wondering whether to consider this as an option at this point.
Basically I have a TU5 blacktop Saxo VTR engine running bike carbs, PH3 and a 4-2-1. Makes 110bhp and will do it all day long.
However, it's in a Hillman Imp, still running the Imp transaxle. The torque of the TU5 could probably kill the transaxle, and it's an iron block, so I'm carrying a slight weight penalty at the rear end. That said, I'd like to keep the TU5 head as I have the carbs/cam etc already fitted, and it's all plumbed in nicely.
Was wondering if the TU5 head would fit a TU3S block I have? It would save me some weight, and reduce the torque slightly (certainly move it up the rev range a bit) while *hopefully* not losing too much in the way of power. I'm thinking the valves will clear the pistons, because they're smaller than the TU24 valves, which use the same bore as the TU3. Not sure about compression ratios though, and it's been suggested this could be an issue.
Anyone been there, done it?