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Old 05-17-2004, 03:00 PM
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Main caps... questions

Hey all,

Tried searching the archives but didn't come up with much of any use.

I have a set of splayed billet caps I'm installing in my SBC.

Question #1: should the inner/outer bolt torque specs differ at all from standard factory four bolt mains?

Question #2: for ARP main cap studs, what kind of thread treatment should I use to get them in the block? I've read that people epoxy them into the block?

Question #3: for those same ARP main cap studs, what should the installed height of the studs be? I turned them in by hand until I could feel resistance on the thread (starting to bottom out) and then backed them out two turns or so.

Note: these are non-windage tray studs.

thanks in advance. I want to double check everything this time... too much invested at this point to screw it up again (been there, done that)

the blonde weasel

update:

Question #2: I'm asking which type of loctite to use on the main caps. the red stuff?

Last edited by blndweasel; 05-17-2004 at 03:00 PM.
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Old 05-17-2004, 03:12 PM
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can answer only #1. inners 70#s outters 65#s
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Old 05-17-2004, 03:16 PM
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When the block was machined to accept the splayed caps the fastners should have been used to do the line bore/hone. Some people use bolts on the outers some use studs. Either way you need to use what the shop used, if not this will distort the housing bore.

Torque will be specified by the fastner supplier.

Chris
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Old 05-17-2004, 03:18 PM
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yeah, that goes without saying. the mains were align honed with the same fasteners.

so 70 inner 65 outer? same as factory?
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Old 05-17-2004, 03:21 PM
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The torque specs should have been supplied with the studs and bolts. What size are the outer bolts-they can be either 3/8" or 7/16". You don't need any locking compound on the studs. Install them according to the specs, they can be found at:

www.arp-bolts.com

tom

If the outers are 3/8" and you torque them to 65 ft.lbs., you'll be fixing stripped bolt holes.
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Old 05-17-2004, 03:22 PM
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7/16.

alright, yeah I pulled the spec sheet from ARP so I should be good now.

thanks everyone
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Old 05-17-2004, 03:45 PM
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good, the stock specs vary from the arp. inners or outers either are good or bad depending on whether you use the "moly lube"
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Old 05-17-2004, 04:49 PM
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Double check on assembly that the mains are have the correct clearance. Check them all under load. Torque all of the bolts/studs and check with plastiguage.

ARP recommended that I rehone the mains when I installed my 90o 4 bolt main studs. They said the bores could end up smaller with the studs installed. I had the machine shop check them, and luckily they came out right on the money.
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Old 05-17-2004, 04:52 PM
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yeah, don't worry the whole assembly is to be blueprinted... now i'm just waiting on a new set of inside micrometers...

thanks for all your advice
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Old 05-17-2004, 05:56 PM
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Aaaaah... Question here! ...HOW do you install splayed billet caps with stud bolts? ...Use studs on the inside bolt locations and regular hex. hd. bolts on the outside spayed locations? Just wondering? ...Mark
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Old 05-17-2004, 08:11 PM
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Quote:
Originally posted by 11echo
Aaaaah... Question here! ...HOW do you install splayed billet caps with stud bolts? ...Use studs on the inside bolt locations and regular hex. hd. bolts on the outside spayed locations? Just wondering? ...Mark
Yup.

tom
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Old 05-18-2004, 05:39 AM
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caps

Something else to look for is... The outter bolts will sometimes break into the waterjackets. It depends on what angle the bolts are in the caps and what block 350/400. Double check to see if they are through and if they are you will need to put some thread sealer on the bolts so they don't leak. If they are blind holes check the boltscarefully to make sure they are not bottoming out...

Keith
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Old 05-18-2004, 06:45 AM
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We make a special stud with a 5/16" hex on the end for those that want to stud the outer bolts. This makes for easy R&R without damaging the studs.

Chris
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