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#1
05-25-2021, 12:18 AM
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461 Front Counterweight Clearance
I’m mocking the build on a 400 stroker right now and had to massage the front drivers side of the block to get the crankshaft to rotate. After working it for a bit, I’ve got a little north of .030 clearance between the counterweight and block.
I just referenced a stock 455 I have and it’s got around .055 of clearance in the same spot and wasn’t able to find anything on the forum about how much clearance is enough. Is there a general consensus on how much it should be? Thanks in advance!
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1969 GTO .040 over 400, 68cc #62 heads, stump puller cam TH400, 3.31 posi |
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#2
05-25-2021, 12:58 AM
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From what I have seen 0.060 to 0.080 clearance...
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#3
05-25-2021, 04:06 AM
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Definitely a non-critical area. I usually just grind that area down on my preliminary cleanup if an aftermarket crank will be in the works. Better to get the dirty stuff out of the way early before you break out the bearings or crank. Figure if that counterweight moves over even a few thousandths there's a much more serious problem to worry about than that clearance.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
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#4
05-25-2021, 06:23 AM
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.030” is fine unless you where going to be making over 650 hp with a steel crank!
If things where to flex ( block or crank ) around enough to need more then that ,030” then you have a motor that will fail in short order anyway! If it will help you to sleep better then go for a additional.010” and make it .040”.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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