I am seeking the exact movement of a rotating assembley in a LT1 block. The rotating assembley is an Eagle all Forged one. I am concerned with rod clearances. I am needing to know if the assembly moves even a .001" when the motor heats up and up to 6,000 RPM's. Thanks for your time and help.

 

Yes. Why?

A 6 inch long rod grows .001 in length for about every 28* F you heat it, and the crank throw moves out .001 for about every 90*F.

 

Why? Indeed, why? If the "clearance" is just 0.001", it isn't enough.

Rich

 

Thanks for your answers. This will be my first time stroking a closed deck block. I have stroked Honda motors on the side for money only because of the easy open deck design. You can clearly see where the water jackets come and go. I appreciate your help.

 

Good luck. I hope it's your engine.

 

Thank you. It is my motor. I have two blocks and 3 sets of heads (porting my own heads as well). Again I have done it on Honda's but it is not like they are making big horsepower to begin with...

 

Mock it all up before final assembly. Set the crank in and snug the bolts and use a rod/piston assembly and go through each cylinder. Drop the piston into the bore with no rings (wrap some tape around the ringlands so they don't scratch the bores) and put the rod cap on finger tight. You can use the same rod/piston for all 8 or use different ones. Now's a good time to check your deck heights too Gently sping the crank and look for metal to metal. The rod bolts will more than likely hit the block, especially on the #4 journal. Also look for the piston skirts hitting the counderweights. Sight through the cam bores while looking for the big end of the rod to hit the bottoms of the cylinder bores. .100" clearance is plenty in all of these spots, lots of builders go by .060" as a rule of thumb.