View Full Version : differences 259 & 289

10-20-2006, 11:35 AM
I'v read the difference between the two engines is in the stroke,so that would make the crankshafts diff.It would also seem the camshaft would differ.Rod & main bearings are the same what about bore & piston rods,heads etc.I'm talking factory specs for stock engines ?

kmul & the $$ eating 63GT

1956 Hawk
10-20-2006, 11:58 AM
As far as I know the only difference between a 259 and 289 is the crankshaft and the pistons. Because the rods are the same length the piston pin is located higher on the 289. Also on non R series engines the 289 used a dished piston to keep the compression ratio the same as the 259 with flat top pistons.

Mike Van Veghten
10-20-2006, 12:38 PM
Like 56 Hawk says...the crank and pistons are the only differences dealing with the cubic inches.

Your question only asks about 259's and 289's as a displacement question.

As I'm sure you know...over the years, there were many cams, head castings, pistons, distributors, carburetors, intake manifolds, at least two exhaust manifolds, a few oil pans, water manifolds, valley covers, rocker covers.......need I go on?
These were all "OEM" changes.