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Old 01-17-2012, 03:19 AM
chevy302builder18's Avatar
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400 mains inner diameter 2.82 inches?

ok so the block i have has 2.82 on the journals and factory 400 sbc was 2.65? I believe... Its been line honed? The rear and front main look all right its just i mic'd it out and it said 2.82 on both... Wander if its safe or junk to even line bore it anymore, machinist said it had to be bored with new splayed caps... Of coarse when he looked at me he just said it was just needing line honed, and then i told him it had after market caps he started racking me with fees. It hasnt been done yet but im wandering if the block is safe past this mark, soon itll be 2.90 and i was also wandering if they even sell main bearings for this kinda thing

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Old 01-17-2012, 06:45 AM
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Only repair bearings (usually in -.010) are available in oversize OD (usually +.020.). These are not performance bearings.

I would pass on that block.. Machinest is correct, aftermkt caps will need much more work=$$$.

I get a bunch of calls from guys that can't understand why aftermkt caps install cost so much.. They don't realize that the caps have to be rough fitted. This may involve cutting new cap register, cutting new cap surface, cutting new bearing tang, drilling/tapping block. Then line bore/hone.

All take time and equipment== $$$.
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Old 01-17-2012, 01:08 PM
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I got to the shop and checked the books.. Crank OD is 2,6484/2.6493"

You must be measuring incorrectly as. 400 housing bore spec is 2.8406/2.8415". If your block measures this, it's OK, if larger it has been cut for larger OD bearings, As mentioned these would be repair bearings not available in many common ID sizes. Or the block has been in the hands of a rebuilder such as Jasper. These guys use every block that come thru and use custom OD bearings to fit their final size.. You and I can't get them.. Makes for real fun if the block needs another build after they get thru with it,,

Also have fun getting a rear seal that fits.. Been there..

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Old 01-18-2012, 01:41 AM
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O thank god, thank you for letting me know that it is suppose to be that exact measurement. Just a few off i suppose.. Its stock then right? The main housings did measure 2.82 i geuss its a lil small
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Old 01-18-2012, 01:55 AM
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Quote:
Originally Posted by BOBCRMAN@aol.com
I got to the shop and checked the books.. Crank OD is 2,6484/2.6493"

You must be measuring incorrectly as. 400 housing bore spec is 2.8406/2.8415". If your block measures this, it's OK, if larger it has been cut for larger OD bearings, As mentioned these would be repair bearings not available in many common ID sizes. Or the block has been in the hands of a rebuilder such as Jasper. These guys use every block that come thru and use custom OD bearings to fit their final size.. You and I can't get them.. Makes for real fun if the block needs another build after they get thru with it,,

Also have fun getting a rear seal that fits.. Been there..
wait a second i just remeasured and it came out to spec of what you said above... I prob wont let em touch the rear main housing and ill prob make em hone it out instead of going through all that.
Not that i was trying to put the machinist down either, the guy was new to me and i dont know much bout there buisness, i coulda been getting ripped off. They were real jittery about racking the fees looking at one another and shaking there heads real funny... Its like they were paranoid.
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Old 01-18-2012, 02:12 AM
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Quote:
Originally Posted by BOBCRMAN@aol.com
Only repair bearings (usually in -.010) are available in oversize OD (usually +.020.). These are not performance bearings.

I would pass on that block.. Machinest is correct, aftermkt caps will need much more work=$$$.

I get a bunch of calls from guys that can't understand why aftermkt caps install cost so much.. They don't realize that the caps have to be rough fitted. This may involve cutting new cap register, cutting new cap surface, cutting new bearing tang, drilling/tapping block. Then line bore/hone.

All take time and equipment== $$$.
And the caps i recieved didnt even need machined on the registers, i just torqued em into place, a lil bit of file here, lil bit of tle there, they slid in beautiful. And the clearances on the splayed outter step within spec, machinist even said so. I just rough fitted em my self, understanding the physics of metalurgy, everyone knows a block, takes time to 'heel' and 'form' new groooves, the registers were so loose with the old caps it wasnt funny. The aftermarket caps have a tight squeeze now just the way i like it. Like the thousand times ive put em in and took em back out of the registers, i was hoping the registers would conform. And so they did
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