[Andrew Blow]

Ford engine into a Bristol?
Ford 6 cylinder engines, in fact virtually any other 6 cylinder engine WILL NOT FIT a 6 cylinder Bristol without significant surgery.
The value of the car drops almost to less than the car was without an engine, in my "humble" opinion. Remember that Bristols made many more engines than they did 6 cylinder cars, so engine supply is actually not that bad.
Also bear in mind that the "lowly" 85 series engine, fitted to 400s, 401s and 402s, can be made to give a very usefull 100 bhp without anything very radical these days, so I implore people to look for these engines and get them working, rather than endless discussions about fitting an xyz engine. Also bear in mind that other engines are going to link to other instruments, so your dash will change as well, futher devaluing the car. The same applies to gearboxes.

ACs made chassis to take a wide variety of engines - quite sensible if you are (dare I say it) a "kit car" company. Bristols only made the 6 Bristol car to take a 6 cylinder Bristol engine. End of story.

6 cylinder "Bristol-type" heads have been made for several years, so I think this is another dead end. Yes, you might make them cheaper, but the demand is not actually that high, so the chance of a successful enterprise is very low, I feel.

One request, for a personal project, I am looking for some valve gear (rockers, shafts etc) for an 85 head. Anyone got a box full??

Andrew Blow