Stroking a 340...what machine work needs to be done?

[Challngd73]

Hello all. I have a 1970 340 bored .60 over that I have been thinking about putting a stroker kit in. Is there machine work that would need to be done to put a stroker crank in?

 

[spinman_1949]

Reach out to this member.

http://www.forabodiesonly.com/mopar/member.php?u=18781

I do not think he is particularly fond of 340's but he likely knows more than most, since he builds engines for a living.

 

[tubtar]

How much stroke ? Up to 4 " , you might need to relieve the bottom of the bores a little bit if you are swinging stock rods.
3.79 would be a drop in.
But most kits have rods that are made for this and will work as is.
Over 4 " , you will have to pay attention for sure.

 

[340sFastback]

For a 4" stroke with Scat I-beams no mods to the block are needed.

 

[Challngd73]

Well that is good to hear. 4" stroke and down is a drop in then. Thanks guys.

 

[340sFastback]

Stock rods or H-beam rods will require the block to be notched to clear the lower bore.

 

[Demon416]

H-beam rods I had to also clearance the oil pump.

 

[jimjimjimmy]

once you use a 4 inch stroker crank you will never go back to a 3.31 the torque beats the hp imop