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406chevycaprice 01-16-2008 09:41 AM

406 or ?
i'm confused on what i really have .i rebuilt a sbc 400.i bored it .30 over put 5.7 cam clearing rods in with a 400 crank .now does this make it 406 or ?

DoubleVision 01-16-2008 09:45 AM

You have a 406.

406chevycaprice 01-16-2008 09:47 AM

406 or ?
i thought with a longer rod it would make more displacement

DoubleVision 01-16-2008 10:21 AM

Nope, the lenth of the rod has no effect on the stroke depth, only the crank does. When you have the same bore and stroke you have the same cubic inches. You increased the bore size so you picked up about 5 cubic inches, but the lenth of the rod has no effect, the stroke of the crank stays the same regardless of the rod lenth.

UR50SLO 01-16-2008 02:31 PM

Yes.... the displacment is the same but there is alot of benifit to having a longer rod there. You did the right thing putting in the 5.7 Rod.

You won't regret it.... My 406 went 11.60's on pump gas through the mufflers on Dot's. In a 89 Camaro.

Now my V6 go's 10's but who's counting... :thumbup:


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