Seized 355 help

**Down** · 08-31-2015, 09:17 PM

Very long story short, I somehow managed to get metal shavings in a built 355 that has never been on the road. Motor is as follows:
4.030 speed pro forged pistons
Manley 5.7 forged rods
Stock crank
Block zero decked
Line honed
Impy gaskets
Arp headbolts/main studs
LE2 heads (haven't confirmed)
CC306
Pro Form 1.6 nsa w/tfs guides
I don't know how it happened, or what I did, but I'm putting the blame on myself. The car has had an incredible amount of a misfire, and balancing issues. I'm figuring it's seized due to rather large round metal shavings in my oil pan & that I've broken 4 starters.
I've been quoted 1250-2000 by a reputable shop to fix the issue given that all major parts are OK. My question is, should I and/or can I get a forged 3.75" crank & essentially turn this into a 383 with minimal effort given what I currently own & have all supporting mods?

I'm open to any suggestions. Just kind of at a crossroad right now. Having a car for 5 years and not putting a mile on it is just.....heartbreaking to say the least.

**firebird_1995** · 08-31-2015, 09:36 PM

A 3.75" stroke crank means new pistons, clearancing, and rebalancing. I would be curious how/why it happened before trying a new combo

**Camaro96** · 08-31-2015, 10:39 PM

Try to turn the engine over by hand using a socket and breaker bar on the crankshaft pulley bolt. You may want to remove the spark plugs. You may also remove the dust cover if it is an automatic did you can turn the flywheel. You may also see if you can wiggle flywheel back and forth it may be broken. Good luck man

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**Down** · 08-31-2015, 10:54 PM

I tried turning over by hand using the teeth on the fw but to no avail. It's a brand new McLeod street twin. I'll remove the spark plugs & try turning over that way as well. Only thing I'm worried about is all the metal shavings in my oil. It was a substantial amount.

**Camaro96** · 08-31-2015, 10:54 PM

The rotating assembly has it been balanced?

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**Down** · 08-31-2015, 10:58 PM

It's externally balanced for some odd reason. I went through hell trying to figure out why it vibrated so badly. Had to raise the motor drop the pan find no slugs then remove the t56 and add the McLeod weights to the flywheel. When I lowered the car to move it a few feet the vibrating was bad. Real bad.

**SSlowBoat** · 09-01-2015, 10:32 AM

Try cranking motor backwards a little bit before going forwards with a breaker bar

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**Down** · 09-01-2015, 01:12 PM

Originally Posted by SSlowBoat

Try cranking motor backwards a little bit before going forwards with a breaker bar

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Using the hub?

**SSlowBoat** · 09-01-2015, 07:46 PM

Originally Posted by Down

Using the hub?

Yep, if the bolt loosens shove something in the balancer to do it

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**Down** · 09-02-2015, 12:00 PM

Tried. Only moves 1/8 inch either way then stops. Won't budge in either direction. My hub/balancer is a Jegs piece so I'm unable to jam anything in it to stop the bolts from backing out. Guess I'm pulling her out