340

[brotow]

Ok heres the story, I'm putting together a 70 t/a wannabe(not clone) I have a 340/6pk(72) rebuilt but some one left a piece of plastic in there.  And of course it got jamed in the oil pump, shearing the shaft, welding #1 connecting rod, till it snaped off the crank.  Gouged the crank a bit.  The engine pistons are stamped std. heads=253189-d &-d x heads I believe, edelbrook 6pk manifold(no numbers) stock? block is 340-4. I know all bearings need to be replaced, oil pump, new connect rod, crank repair or replaced (which ever is cheaper --maybe replace with a cast crank?) I'm just wondering nows the time to add  or make any modes for hp or durability.  Whats the best route?

Glenn

[Chryco Psycho]

I would use a 318 steel crank & rebalance it before using a cast crank
 your heads should have casting 3 2841894-?
 edelbrock made the original intakes for the 340 but never had a carb to fit it
 I would use a Hp oil pump , full grove brgs , good rod bolts  , , double True roller timing chain ,& possibly install a cam depending what is in there now
 make sure the rotating assy is balanced as well

[moparnut]

If its a 4 speed you would have to change the flywheel as well if you went with cast,the balancer would have to be changed regardless,stick with forged as CHryco said

[brotow]

It's an auto.  Crank 253245   cam dl  18  1136     block2780920-349-4      heads 2531894   exaust man. 2863553 ?   rods 3418645      pistons 380-99.  I don't know if these numbers mean anything?

[Chryco Psycho]

X heads , presumably a 68-70 block

[brotow]

Block is a 72 I believe

[Chryco Psycho]

it was cast in 72 but installed in a 73 car due to the 9 th month casting date