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I think that they use a 4.00 stroke crankshaft with 4.030 bore.
Maybe I am not shure ...
Because a 401ci is made from a 3.875 stroke crankshaft with 4.060 bore
4.030 bore (0.030 over) and 4.00 stroke make 409. That's a lot of stroke, and most won't recommend boring more than 30 over on the LT1 block. I know there are people here that have 409 LT motors. I'm guessing it will take a lot of clearancing.
4.030 bore (0.030 over) and 4.00 stroke make 409. That's a lot of stroke, and most won't recommend boring more than 30 over on the LT1 block. I know there are people here that have 409 LT motors. I'm guessing it will take a lot of clearancing.
I agree thats alot of stroke! I am curious as to just how much clearancing is involved. And if it would be worth it over a 396 or 383?
I seem to have this wild hair up my azz about rebuilding my short bolck this winter. Just tossing around a few options!
Now that's an LT1!!!! (actually an LT4 but you know what I'm sayin!)
That Thing is a Beast! Plus his car is way setup!!!
However I don't think there is that much advantage over a 396 except 409 sounds bigger?!?! I feel like you could get the same HP with either. Maybe a little more torque with the extra CI.