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Discussion Starter #1
---I bought a block for my brother last night, but noticed that one of the cranks he had was a four inch stroke(366 has a 3.76 stroke) and had been turned down .001. And the other wasn't marked(with a marker) at all but did find these numbers cast on them.
The one that we know is a 4" crank had GMT 2(there made have been another number but the stamping wasn't very good) and 7416.
On the other I found GMT 60 and 6223.
I'm not sure if that is enough info, but was all I could find on them.
---My seond question is this. Will the 366 accept a 4" stroke? If so what would that be with just the standard bore? Thanks in advance.
 

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Discussion Starter #3
Where can I find that information out. I'm not second guessing you at all. I looked for that and couldn't find any info on it. Thanks for the help. Jason
 

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Heck, I bet the 366 block will probably swallow a 4.25" crank just fine!

Might have to do some grinding, but I kinda doubt it. (Fwiw, it has a 3.935" bore vs a 454 at 4.25"!)..

My '75 454 P/U block did!

Only problem is that even with a .125" overbore and the 4.25" crank, you only make an undersquare 434" motor. (Undersquare means that the stroke is longer then the bore is wide is all. Great for low rpm torque!)..

Using a 454 with a .100" overbore, you make a 505.5" oversquare motor so why walk away from the cubes? (Oversquare means that the bore is wider then the stroke is long, better high rpm capability!!)...

pdq67
 

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Discussion Starter #6
Thanks for all the help. The reason for not wanting more cubes is because he really doesn't need/want massive cubes due to the fact that it is going into an 82 cj7(hopefully I can talk him into getting a camaro or at least a nova!!!). The reason I wanted to know if it will accept the 4" stroke is I figured if I was going to spend money on a crank, I would spend it on the "better" one if they cost the same. A 454 is pretty much out of the question for him, but I'm trying to build my 402 and everyone keeps refering to a 454. I wouldn't mind AT ALL to build a 454, but I can't find one for reasonible $. I found one today for 450$ which seems pretty steep to me, yet alot of people say they are easy to find. Is this a reasonable price? Are there certain vehicles that were equiped with a 454 that most people over look(pick and pulls are pretty well picked through around here)? Or should I just build the 402 and hope for the best? Thanks again for the help. Jason Hopson
 

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If your wanting to put the 4" stroke crank in the 366 block, It should work fine as long as you have the correct balancer and flexplate or have the assembly balanced. I think you may have a problem with the pistons. Please correct me if I'm wrong but 454's or 4" crank motors have different pin placement in the pistons to allow for the crank throws. You may have to have a custom set of pistons made for your motor. You would probably want to do this anyway because of the truck 366 piston weight.
 
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