View Full Version : 6-cylinders id

06-28-2009, 07:59 AM
how can you tell the difference between the 170 and the 185 flathead 6-cylinder? and how do you id. the engine? with out tearing it down? what is the max. overbore? are they the same block?any info would be welcomed. thanks hotrodstude

06-28-2009, 11:18 AM
What's the engine number? It will be stamped into a raised portion of the block.


Matthew Burnette
Hazlehurst, GA


Dwain G.
06-28-2009, 03:25 PM
The easiest way might be to check the block casting number found low on the left side of the block about half-way back. A 185 will have the number 533870 there. (Ignore any suffix number you see there)
185's were used in cars and trucks from 1955 through 1958. They were also sold as factory replacement engines for earlier models, so there may not be a stamped engine serial number on those blocks.
These blocks have been successfully bored 1/8" over, but pistons that size are sort of a hot rod item. Probably .060" over is the largest readily available piston size.

HEY, you're not Wilbur!