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> Jensen Healey & Jensen GT Tech > VIN Database for Jensen Healey & Jensen GT > Engine number interpretation |
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> Jensen Healey & Jensen GT Tech > VIN Database for Jensen Healey & Jensen GT > Engine number interpretation |
| Moderated by: Greg Fletcher |
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| Engine number interpretation | Rating: 
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| Posted: 02-08-2025 10:19 am |
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1st Post |
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David_R1 Member
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Hi all, I am looking to purchase what looks to be a Jensen Healey MKII but I am a bit confused as to how to interpret the engine number (taken from the back end of the block). It reads as B7403 6197 with a substantial gap between the 2 sets of numbers. Also, the zero in 7403 is not fully stamped, so could possibly be a 9. I thought the engine numbers are only 4 digits, hence my question. Appreciate any guidance that can be provided
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| Posted: 02-08-2025 11:17 am |
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2nd Post |
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David_R1 Member
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Also found the number BB107 on the head. Is this meaningful information ? If so, what should I glean from that number ?
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| Posted: 02-08-2025 01:16 pm |
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3rd Post |
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noomg Member
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David, That B74 identifies the motor as a '74 which has the improved rear seal the earlier motors B73 used a rope seal which could be problematic (leaks). The MkII is easily identifiable from the MkI, it has rubber bumpers, wood trimmed interior, and all but the early ones have a 5spd.
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| Posted: 02-09-2025 12:23 am |
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4th Post |
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Tim Murphy Member 
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As I understand it, B7403 means the engine was built the third month of 1974, the 6197 is the four digit engine number as you stated.
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| Posted: 02-09-2025 12:41 am |
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5th Post |
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David_R1 Member
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Thanks guys. Are you able to point me towards where I might find any more info with regards to the build spec of this engine number ?
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