| Also known as | CP29/40 |
| Listed in parts books | Not catalogued by year yet |
PISTON SET +.040 (64mm) 5T 1939-57 - 7-1 COMPRESSION - Use CP161 for 9:1
Oversize +.040 (64mm) piston set for the 7:1 compression Triumph 5T, 1939-57.
This is a +.040 oversize piston set for the Triumph 5T, sized at 64mm, built for the 7:1 compression engines used across the 1939-57 span in the catalog listing. It's an oversize option, meaning it's meant for a bore that's already been taken out .040 over standard, typically during a rebuild where the cylinder has worn or been machined.
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The catalog entry is specific about compression ratio here — this set is for 7:1 engines only. If your 5T runs 9:1 compression, the listing points you to CP161 instead, so it's worth checking which compression your engine is set up for before ordering.
We don't have more detail on this one beyond what's in the listing. If you're not sure whether your cylinder has already been bored to +.040 or what compression ratio your particular 5T carries, give us a call and we'll help you sort it out before you order.
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