681F 6015 rare JA casting designation.

[KiwiFord]

Hi buying a ‘special block’ 681F 6015 JA casting designation motor. Apparently only 50 ever made. Is this correct. Any help would be very much appreciated.

 

[bert]

681f is a rwd block from a cortina I think so not "rare"

 

[RWD3M]

Hi, and welcome to the forum!

Though I must say, assuming that you have access to Google, it surprises me somewhat that you would post this query on what is essentially a welding forum.

Regardless, a quick Google search reveals that @bert is quite correct but that so much more is available.

 

[RWD3M]

A slightly longer trawl suggest one can see where seller might be getting his information from:

Lotus-Ford Twin Cam - Wikipedia

en.wikipedia.org

'Assembly of the first 50 engines was contracted out to J.A.Prestwich. Prestwich also machined the raw cylinder head castings (cast by William Mills) on these early twin cam engines.'

However, I suspect that the 'JA' deignation is merely coincidental, and even if it wasn't, there were some 34,000 engines of that spec built.

 

[colnerov]

They weren't the most reliable of engines and were replaced by GT engines to keep the car mobile. The engine then spent the rest of the time in the back of the garage with a rebuild promise until...