Lotus Elan

1965 Elan S2 engine block question

PostPost by: Certified Lotus » Sun Sep 16, 2018 4:59 am

I recently purchased this 1965 Elan S2 (US Location) and have a question about the engine originality. The block has the following stamped on it: LP 5908LBA. The serial number of the car is US65164055. Any insights would be greatly appreciated.

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PostPost by: Elanintheforest » Sun Sep 16, 2018 7:57 am

Your original engine was LP2437, with LP5908 coming from an Elan built at the end of 1966. Have you checked the back of the head to see what numbers are stamped on that? If it has the half-moon projections in the plug well, it may be the original head to your car. LP5908 would have had the later head.
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PostPost by: trw99 » Mon Sep 17, 2018 10:21 am

Just to add to Mark's posting, Glen, that car was invoiced by the factory in Nov 64, though clearly landed in N America a month or three later and was thus titled 1965.

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PostPost by: Certified Lotus » Wed Sep 19, 2018 3:58 am

Thanks Mark & Tim. I can always depend on the two of you for the answers! Gotta wonder why an engine replacement 2 years from new and from another Elan.......
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65 Elan S2 - 26/4055
72 Europa - 74/2358R
69 Elan S4 - 45/7941
64 Elan S1 - 26/0379
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PostPost by: Certified Lotus » Wed Sep 26, 2018 1:40 pm

Finally back to my garage. The Weber head number seems to be 26E311. Any insights which original block this was mated to?

c27a9c92-f6eb-433e-8c49-45c0f7782c02.jpeg and

e7816dd6-cf6f-4eeb-91ba-2ed7726474fe.jpeg and
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65 Elan S2 - 26/4055
72 Europa - 74/2358R
69 Elan S4 - 45/7941
64 Elan S1 - 26/0379
12 Colin 30 - Lotus Racing Kart
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PostPost by: types26/36 » Wed Sep 26, 2018 1:52 pm

I think the 26E number is just the casting number (its cast into the head) the matching block/head number is lower down just under the small water welsh plug and is stamped although I have seen the early heads with no number stamped and only the casting number.
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PostPost by: Certified Lotus » Wed Sep 26, 2018 2:25 pm

Thanks Brian. How easily I forgot where the serial number is located on the head. Found it! Yes, matches the original block number (2437) , so only the block was changed a year or two after the car was shipped to the US.

4af27551-fc32-4ee6-9d07-bfbc1f539d39.jpeg and
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65 Elan S2 - 26/4055
72 Europa - 74/2358R
69 Elan S4 - 45/7941
64 Elan S1 - 26/0379
12 Colin 30 - Lotus Racing Kart
07 Exige S - Wicked Road/Track Car
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PostPost by: benymazz » Thu Oct 11, 2018 6:16 pm

Certified Lotus wrote:Thanks Mark & Tim. I can always depend on the two of you for the answers! Gotta wonder why an engine replacement 2 years from new and from another Elan.......


I just caught this scrolling through this thread... One (or two) such cases happened to my father's 65 S2. He bought his Elan off the line in England, and had it ferried back to the US. It was stolen off of the ferry once it got back here, but was recovered a few weeks later. Apparently, the car had been abused so badly that only a couple of weeks after it was returned to my dad, when he was driving up a hill on his way home from work it threw a connecting rod. I don't know what happened to that engine, but I believed it may have been swapped immediately.

Later, around 1968, the maintenance log says "New engine - Cortina". The car had 49,450 miles on it at that point. I believe I have this engine currently, but I'm not sure -- the engine block is stamped with LP5494LBA.

I also have a head on a different engine stamped LP6215 or 6245, I can't quite read the third digit.

If anyone has any information on these, I know this isn't lotuscortina.net, but I'm curious...
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