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Do they not make 400 crankshafts anymore?

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Do they not make 400 crankshafts anymore?

CRM318 CRM318
New User | Posts: 5 | Joined: 02/14
Posted: 05/14/14
02:56 PM

I just tore down my 1971 YS 400 and i dont know if the crank can be turned. It has light gouging on it. It measures 2.99-2.98 at the main journals (measured with a cheap digital mic) and 2.24 on the rod journals. I have looked for a replacement crank just in case and I cant find one for a 3.75 factory stroke. All i can find is stroker cranks and rotating assemblies. The reason I want to stay with 3.75 is because i will be using a set of big valve high comp #16 heads. Maybe the crank can be turned. Is there anything wrong with a rebuilt/re-manufactured crank?  

tempest1964 tempest1964
User | Posts: 66 | Joined: 11/11
Posted: 05/14/14
03:47 PM

If you google "Ohio Crank" they list a crank for the Pontiac 400. It says it has the 3.75 stroke. It says its forged and about $680.
Good Luck  

gtojack1366 gtojack1366
Guru | Posts: 1276 | Joined: 11/09
Posted: 05/14/14
06:56 PM

Just get a crankshaft kit .The one I got was cut 10/10 and came with clevite bearings . $205 dollars . Autozone has them .  

shyrgfuh3 shyrgfuh3
Enthusiast | Posts: 496 | Joined: 11/13
Posted: 05/15/14
12:06 PM


if the gouges are too deep they can simply weld it and regrind it. they've been doing this for a zillion years.  

bigD bigD
User | Posts: 155 | Joined: 05/14
Posted: 05/15/14
03:24 PM

Main brgs are available down to at least .030 undersize. Rod brgs are available to .040 undersize. King even shows a .050 & a .060 undersize rod brg on the Summit site.

If you'd like to keep your crank, take it to a good crank grinder and let him inspect and measure it, to make a determination as to whether it's turnable or not, with the brg sizes available.   Smile