Some time ago & also just recenty there has been speculation of whether or not the 655 truck block can be bored to standard 409 or not. The question in my case has been answered, Courosity finally got the best of me !!
I took a 65 production date block to the machine shop & had it sonic checked. Every block is different , some have core shift worse than others, this is how my block ck'd .
Each cyl. was ck'd in 4 places with a low # on only 1 cyl. of .199 & a max of .309. The bore on this block is pretty well centered & is uniform top to bottom . My conclusion is it won't go standard 409 unless you want to see a good block wasted no1:
As an alternative i put some #s together & this is what i would or will do w/ this block / + .090 with a 4 in stroke & comes out to 446 cubes
Chevy people are spoiled w/ big bores & short strokes that will in stock form RPM very well . Other manufactures use long stokes & smaller bores that run very well Okay maybe they run okay ?????
Some of you guys may differ in opinion , so let's hear your opinions.
BTW for a $25.00 charge ?? for a sonic test it's money well spent.
Happy holidays
I took a 65 production date block to the machine shop & had it sonic checked. Every block is different , some have core shift worse than others, this is how my block ck'd .
Each cyl. was ck'd in 4 places with a low # on only 1 cyl. of .199 & a max of .309. The bore on this block is pretty well centered & is uniform top to bottom . My conclusion is it won't go standard 409 unless you want to see a good block wasted no1:
As an alternative i put some #s together & this is what i would or will do w/ this block / + .090 with a 4 in stroke & comes out to 446 cubes
Chevy people are spoiled w/ big bores & short strokes that will in stock form RPM very well . Other manufactures use long stokes & smaller bores that run very well Okay maybe they run okay ?????
Some of you guys may differ in opinion , so let's hear your opinions.
BTW for a $25.00 charge ?? for a sonic test it's money well spent.
Happy holidays