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Old 12-03-2002, 05:00 PM
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Post cylinder head rebuilding

What all is done when rebuilding a cylinder head and how much does it cost?

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Old 12-03-2002, 05:42 PM
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I have a set of heads I need to have rebuilt and was wondering what all is usually done to them. They are 1971 heads. Would it be better to have hardened seats put in or just use the lead additive?
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Old 12-03-2002, 05:58 PM
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First they may not be worth rebuilding, find out the CC's of them, and make sure it is an good cumbustion chamber, the heads i baught had a 160 dollar rebuild on them, milled, cleaned, 3 angle valve job, new springs retainers, keepers, and valve guides i beleive, The most important thing is the cumbustion chamber,
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Old 12-03-2002, 06:26 PM
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to rebuild a head, first it is cleaned, then magnaflux tested for cracks, all the studs and holes are checked for thread pulls, galling, wear etc. the valve guides are checked for wear, the seats are checked for wear, deck is checked for warp and twist. then the guides are replaced or repaired, usually with bronze liners, (beware of knurled guides, they don't last}, then new seats are counter bored and installed, the seats are then ground to specs, the head is then resurfaced flat. the valves are inspected for stem and keeper wear,bend, pits, etc. good ones are reconditioned, refaced and stems cut to spec. the valve springs are checked for size height and installed pressure, shot blasted. retainers are checked for wear, general condition, keepers are replaced with new. then all these parts are assembled to stock or customer specs, new seals, valve spring shims for spring height, the final assembly is then tested with air for valve seal and bagged and tagged ready for customer.
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Old 12-03-2002, 06:29 PM
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Wow, that's alot of stuff. LOL

How much does it cost to have all of that done?

Also, I found a semi-local machine shop that will do a 3 angle valve job for $145.00. What does that include besides a cleaning? I left several e-mails with them, but no reply! Go figure!!

[ December 03, 2002: Message edited by: stfinney ]</p>
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Old 12-03-2002, 07:28 PM
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the costs vary from location, we get $400.00 outrite for a pair of chevy 350 heads, less for some others. its very hard to find good 350 cores. even the major rebuild co's are going to S.R. type heads for stock rebuilds. they don't crack and are way better than anything gm makes. Most shops that advertise three angle valve jobs for that kind of money mean that is what you will pay for the basic grinding of the valves and seats any extras are just that, usually you are looking at a 500.00 dollar bill when all the other stuff is added up.

[ December 03, 2002: Message edited by: BOBCRMAN@aol.com ]</p>
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Old 12-03-2002, 07:35 PM
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[quote]Originally posted by stfinney:
<strong>Wow, that's alot of stuff. LOL

How much does it cost to have all of that done?

Also, I found a semi-local machine shop that will do a 3 angle valve job for $145.00. What does that include besides a cleaning? I left several e-mails with them, but no reply! Go figure!!

[ December 03, 2002: Message edited by: stfinney ]</strong><hr></blockquote>


That is just for the work. Does not include any parts that need replaced. Valves, guides, seats, springs etc.
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