A last question about con rods. Do you know where the early connecting rods fail ... bolts or in the con rod member?
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My understanding was that the 5/16 inch bolts in the early rods were the weak point and the main advantage of the 125E rods was the move to 3/8 bolts. However I have never seen a failed early rod. I have seen 125E rods that have had both rod failures and bolt failures they where not using high stregnth rod bolts.
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I've found that SDF is still around and they seem to be purely an OEM supplier? http://www.sdf-auto.co.uk/
The "26" stamping makes me think that Lotus must have used these at some point instead of the 116E rods that I would expect to find in my engine. (S2, 26/4461, engine LP2946LBA) They certainly don't seem like something you'd swap it if you were going to the trouble of replacing rods.
This is what mine look like. They'll be getting replaced with beefier ones!
1965 Elan S2
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