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Old 06-01-2009, 08:10 AM
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head suggestion

alright i have three sets of heads i was looking to sell two sets of them
i have a set of 882s, 487s, and some 520s from a 283 that are currently on my engine

350 .060 over flat tops
.480 lift 284 advertised duration crane energizer
edelbrock performer rpm intake
holley 600 carb
currently with the 520s
ported and polished
10.65 to 1 compression
they have 1.72 1.50 valves

i know for sure im getting rid of the 882s How much are they worth?
my biggest question is should i mill the 487s and put them on my engine
they have 75cc chamber and 1.94 1.50 valves
the 520s have a 60 cc chamber
i want to keep my compression
how much can i mill them
would it be worth it

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Old 06-01-2009, 09:19 AM
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the 487s are the best among your choices.
you can have them angle milled if you are really wanting
to increase your compression. you can angle mill them into
the 62 cc range pretty easily.
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Old 06-01-2009, 09:22 AM
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then i have to mill the intake dont i
maybe more like 68cc
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Old 06-01-2009, 09:25 AM
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Quote:
Originally Posted by jgh64pkup
then i have to mill the intake dont i
maybe more like 68cc
if you're looking to be in the 68cc range, you can do a cheaper and simpler
flat mill on them. either way, you'll need to have either the intake surface of the head, or the intake itself, milled to match. it'll depend on the shop you have doing the work. i prefer to do the intake surface of the head but some places prefer doing the intake for their own reasons.
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Old 06-01-2009, 09:42 AM
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how much do you think this would cost
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Old 06-01-2009, 09:45 AM
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Quote:
Originally Posted by jgh64pkup
how much do you think this would cost
shops prices are something of a regionally priced deal, and i don't know what
your area is for prices, but you could expect to be charged about 2-3 hours to flat mill them both and mill the intake surface of the heads, or that's what i would charge.
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Old 06-01-2009, 10:01 AM
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so would it be worth it
how much can i mill off without messing with the intake
this is flat milling not angle milling

Last edited by jgh64pkup; 06-01-2009 at 11:25 AM.
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Old 06-01-2009, 02:05 PM
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anybody?
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Old 06-01-2009, 02:53 PM
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Quote:
Originally Posted by jgh64pkup
so would it be worth it
how much can i mill off without messing with the intake
this is flat milling not angle milling
if you go beyond about .020"-.030" *combined* milling, be that head surface and the block decks, you should mill the intake to fit and properly align.
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Old 06-01-2009, 03:10 PM
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It's hard to put an exact number on it. Production variations and if the block was ever milled can add to how much can be removed from the heads before needing at least port matching of the ports of the head and/or intake to get a straight, no-lip shot down the port.

You're likely to have $100 plus into the milling, with that hundred and what you can get for the heads you don't want, you could easily buy a set of fulies in decent shape, or used Vortec's- but Vortec's require an intake.

Cast iron Vortec intakes are in the $100 range, Al intakes are about $135? new from Professional Products.
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Old 06-01-2009, 05:08 PM
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i can just put the heads on but i will have like 9.3 to 1 compression
i justed called the machine shop they said 50 bucks a head
how come you don think it would be worth it
im already porting them
how many thousandths does it take to make a cc

Last edited by jgh64pkup; 06-01-2009 at 05:15 PM.
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Old 06-01-2009, 05:20 PM
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Flat mill the 487's to 68cc (approx .060") and install with thin .015" head gaskets
felpro #1094
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Old 06-01-2009, 05:25 PM
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Quote:
Originally Posted by jgh64pkup
how come you don think it would be worth it
im already porting them
You just go on ahead just as you are doing. Forget about the Vortec's.
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Old 06-01-2009, 09:29 PM
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how much will the vortecs outflow them
how many ccs is .030
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Old 06-01-2009, 09:49 PM
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For the SBC only -- Open chamber head .0075-.008" equals 1 cc. Closed chamber head .006-.0065" equals 1 cc.

For .030" cut on open head, about 4cc.
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