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Old 05-09-2008, 08:03 PM
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Small Block Chevy Heads - 487X

Can anyone tell me if these heads have hardened valve seats? I cannot tell if they do or not. Would it be really noticable if they did? I know that they did not come that way stock, but they could have been done before I got the heads. Any help would be great! TIA!!



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Last edited by stfinney; 05-13-2008 at 11:21 AM.
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Old 05-09-2008, 08:07 PM
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Those heads do not have hardened exhaust seats.
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Old 05-09-2008, 08:11 PM
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What would be a reasonable amount to pay to have ones put in? Would really like to use these heads, but can't spend a fortune on thm either.
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Old 05-09-2008, 08:46 PM
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Actually, the heads are kind of valuable if they have not had seats put in them. Places like Brezinkski, etc use them for class racing. If they have inserts in them they are not worth anything.

I would do a valve job to them, repair the guides, and run them. The unleaded fuel will beat the seats out, but it takes a long time to do it. For the typical street machine, it's not worth spending the extra money on it.
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Old 05-09-2008, 08:55 PM
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A while back I bought a rebuild kit with new stainless steel valves, new Z28 springs (.550 lift I think) and all new seals for these heads. I could just use a little lead additive for now and save for some aluminum heads later. I am currently using a mix of 624 and 882 heads, which actually came on the 350 block I bought. Would I get a noticable difference in using these 487X heads instead?
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Old 05-10-2008, 12:47 AM
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All 3 are 76cc Chambers so no compression increase. The 882s flow decent air when cleaned up. Some 624s are crack prone. The 487X heads may have a larger Intake runner that would help upper rpm HP.
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Old 05-10-2008, 04:01 PM
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Don't they make a thinner head gasket that helps increase compression a little? What is the normal compression for a 350 with stock heads anyway?
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Old 05-10-2008, 07:06 PM
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Yes you can get thinner Head gaskets. You probably won't find what your looking for in a Summit Catalog. Cometic, GM, MrGasket and many others make MLS/Multi layer head gaskets. Cometic will custom make what ever you need. The 350 came stock anywhere from 7.8-10.5 or 11.00CR stock. If you want the best cheap set of heads the 96-99 GM Vortec 64cc Chmbr, 170cc Intk Rnr. 1.94Intk,1.50 Exh. Should pickup 30HP or more over the 487s. Sell the 487X to someone doing a resto and buy the Vortecs around $500 a set new.
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Old 05-12-2008, 03:10 PM
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I wish I had $500 to buy another set! Would there be any improvement at all using the 487X heads compared to the stock 882/624 heads? The engine I have was bored .060 over (came that way) and has a Weiand Action Plus Intake and 1-5/8 headers. I would like a set of heads that work really good with this combo, without having to buy a new intake manifold also. Any ideas?

Know anyone needing some 487X heads? I may sell them, not sure yet.
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Old 05-12-2008, 03:22 PM
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487x heads flow the best out of all the big chamber medium valve heads (1.94/1.50) these are highly sought after and would give you a small performance boost over your 624 or 882 heads.

Many classes of dirt track racing are restricted to these large chamber heads and the racers are looking for this casting number specifically.

DO NOT PORT THEM have them cleaned and checked for cracks and then sell them on ebay and put the words IMCA and WISSOTA in the title and I will gauruntee that you get $350 for the bare castings and even more if you put new valves and have a valve job done. But they may be worth more as untouched crack free originals. These are getting harder and harder to come by so you may want to hang on to them and sell them in a few years.

To boost compression use a GM performance parts 10105117 head gasket, they are advertised at .028 compressed but they are actually .021 and they are a composite with a metal core, so you don't have to worry about them leaking like a shim gasket but you get the compression boost all the same.

PM me if you want to sell those heads quick. We use them on our circle track motors.
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Old 05-13-2008, 03:15 AM
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Felpro head gasket #1094 is .015" thick and raises the cr by 1/2 a cr ratio compared to a typical .040" composite head gasket. Like stated before the 487X heads are worth more to you, sold on ebay to a oval track racer than on your motor. The 882's and 624's belong in the local steel recycler yard.
The only good smogger head is a melted down smogger head.

Find a set of cheap, affordable, common small chambered 58-64cc SBC heads for your 350.
Common #416 or #450 305 HO heads work very well with home porting and larger 350 sized valves. 305 and 350 TPI (not TBI) 3rd Gen camaro- firebird heads also work well #081-#083 and #113 aluminum castings. Again with porting and larger valves.
Lots of people that upgrade to a aftermarket high perf cylinder head have these factory heads kicking around in their garage.
Any of these heads will work much better as a starting point of a budget buildup, than what you have. In stock form they all have modest airflow ( power potential). Its up to you to modify and port them to get the power out of them on a budget.

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Old 05-13-2008, 06:27 AM
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Thanks everyone for the advice! I am going to go ahead and sell the heads and get a better pair. I know the 882's and 624's are garbage, but they are on the engine and working (for now). I can't wait to ditch them for a better pair! Thanks again!
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Old 05-13-2008, 09:43 AM
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Quote:
Originally Posted by stfinney
Can anyone tell me if these heads have hardened valve seats? I cannot tell if they do or not. Would it be really noticable if they did? I know that they did not come that way stock, but they could have been done before I got the heads. Any help would be great! TIA!!



I attached 2 pics for reference.

Some heads (like the 882's) have induction hardened seats. On such heads it would NOT be noticable. The downside is that hardening makes them more brittle and so they have a tendancy to crack. So if your using a set of these heads make sure you have them checked for cracks.
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Old 05-13-2008, 10:20 AM
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Thanks for your help everyone!

Last edited by stfinney; 05-13-2008 at 01:47 PM.
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Old 06-14-2010, 03:52 PM
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487x heads

can anyone tell me if i will gain horses by changing from 993 heads to 487x
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