[IDS_Bill]

Okay so I am looking for a block to start the buildup for my 427. Since I am not overly concerned about date coding (Homey cannot affors 8k for a block) I found a 1973 454 out of a truck. I am assuming that this would be the standard Mark IV block? I'm thinking this may be a good starting block but I need to find out...

Bill

 

[Eric Kammerer]

It would be a Mark IV block, and with a 396 crank, it would become a 427.

 

[Larger Dave]

Just rebalance it if you use a 396 crank because the 396 had different bob weights than the 427 due to having smaller bore pistons. If you are looking to rev the snot out of this thing (only reason I can see for the small displacement, I would still recommend a forged 4340 crank fresh off the boat from China as being your most bang for the buck in hopes of never hearing a bang.

If it is to be a street motor, bore it 0.030 over and build a 489 with a 4.25" stroker crank in the 454 block. More grins per mile with a long stroke motor pushing 500 inches. The 396 decals look the same on both engines.

Larger Dave