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Old 08-23-2004, 09:24 AM
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New Head bolts? Oil restrictors?

Are new head bolts mandatory when rebuilding an engine? Do they not torque consistantly if they are not new? Also, my shortblock came with 2 oil restrictors taped to the outside. My builder says they are optional, and that they go in the back of the engine in place of the 2 plugs above the cam bearing. Do you guys always use these? Why would I want to limit the amount of oil that goes to the top of my engine?
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Tom

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Old 08-23-2004, 10:45 AM
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New head bolts are not required, so long as your old ones are in good shape and you can still torque them to spec with no problems, I dont see why you should'nt use them again. I always do, never had one break on me. Just be sure to always re-torque the bolts, or re-check the numbers to make sure they are at where they are supposed to be at.

As far as restrictors, from what I hear they are somewhat required in the lower end of the motor, in the mains. Keeping them out can kill your oil pressure. But I'm not to into chevy now am I?
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Old 08-23-2004, 02:59 PM
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You did not state what engine you have.. Some engines MUST have the head bolts replaced. Just about all the late model bi-metal motors take new head bolts. If you don't replace them, you soon will be!!
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Old 08-23-2004, 04:15 PM
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Sorry, this is a small block chevy. 1984 block casting with new cast iron World Product Sportsman II heads. I actually bought some Fel-Pro head bolts at O'Reileys today, and they look weaker than the stock ones! They have a real small head on them. 1/2 inch whereas the stock bolts take a 5/8 socket. I think I'm better off with my stock ones! Also, what type of thread goop goes on them?? Anti-seize? Thread locker? Thread sealer? The original stuff is still on the old bolts, and it is white.
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Tom
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Old 08-23-2004, 06:46 PM
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I use teflon paste. The new head bolts you bought are the same that are used on all the newer chevy smallblocks
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Old 08-23-2004, 07:01 PM
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Generally speaking, for a mild street type performance small Chevy, you don't generally have to replace the head bolts. Small Chevys are blessed with an abundance of head bolts and the clamping force required to keep the head gasket sealed is easily achieved with the stockers.

For anything hotter or any type of racing, I like to use new ARP head studs.
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Old 08-23-2004, 08:43 PM
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what NAIRB said
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Old 08-24-2004, 11:57 PM
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i've got a 406 that i replaced head gaskets 3 or 4 times i about 1 1/2 yrs. before i figured out that it was the head bolts not retaining their tork.i probably had the original bolts but after that i'm a big fan of ARP bolts and i won't be using them for more than 1/2 dozen use's.
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