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zz4 heads vs sportsman II

 
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cochino12
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Joined: 30 Jun 2003
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PostPosted: Tue Jul 29, 2003 5:11 pm    Post subject: zz4 heads vs sportsman II Reply with quote

Just wondering if anyone could tell me which would give me better power for the same $ for my zz4 bottom end. For the same amount of money should I have the zz4 heads worked or should I rework my iron sportsman II's. If i use the sportsman's I will be running a performer intake and I have a 600 cfm edelbrock carb. Thanks for any input
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Tue Jul 29, 2003 5:17 pm    Post subject: Reply with quote

Some interesting reading for you.

A quote from that page.
Quote:
This cylinder head is a bolt-on 40 horsepower increase when used on our ZZ4 crate engine. With appropriate camshaft selection, a single plane intake manifold and a 750 cfm carburetor, a ZZ4 crate engine is capable of producing 500+ horsepower.

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cochino12
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PostPosted: Tue Jul 29, 2003 5:31 pm    Post subject: Reply with quote

I hear thats a great combo but I actually have a set of sportsman II's from my old motor. I just figured I would try and get as much power out of what I already have. Seems to me like besides the weight the sportsmans will be the way to go.
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PostPosted: Tue Jul 29, 2003 8:48 pm    Post subject: heads Reply with quote

i have a set of the gmpp heads, and can tell you that the combustion chamber will need cleaned up--casting sand imprints. also i removed all the excess alum around the pushrod holes--good thing too,--i can do a cam swap without removing the intake!!
the only draw back would be the high runner intake only intake manifold--ie vortec. it is drilled for the standard intakes but unless you can weld to alum you have to run a vortec style inake Shocked .
i tried a torker 2 and had about 1/16" head intake runner showing each side.
all in all the heads need general clean up with a dremmel, sandpaper, and steel wool. plenty of metal to work with!
i am not dissapointed.
my .02
eric
ps my 73 nova does 13.8 in the quater
355ci sbc
mild cam
gmpp fastburns
p245 60r14 radials
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clay
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Joined: 24 Nov 2002
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Tue Jul 29, 2003 10:06 pm    Post subject: Reply with quote

Not sure exactly which heads come on the ZZ4. The Sportsman II's don't flow really any better than a set of Vortec's. They will flow more if you are willing to spend some time with a die grinder. Check out chevyhiperformance.com for flow numbers. If you want to port the Dart's, buying David Vizand's head porting book is a must. I ported a set going by his book and am happy with the results. The problem with the Dart's is they aren't worth paying anybody to port them when you can buy a new set of aluminum heads for a few hundred more, flow more and lose weight. Going by Vizard's book the Dart's are a good set of heads after porting. Good luck. Clay
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Tue Jul 29, 2003 10:08 pm    Post subject: Reply with quote

I understand what you're saying about using your sportsman II's. I have a set myself.

For what it's worth jeep_406 sent me the flow numbers from his heads.

LIFT INTAKE EXHAUST
0.050...40.6.........30.3
0.100...72.7.........57.0
0.150...106.7........84.6
0.200...140.1........106.2
0.250...168.0........123.7
0.300...191.1........142.1
0.350...210.2........159.7
0.400...226.4........175.2
0.450...237.9........186.8
0.500...248.3........193.8
0.550...255.1........201.8

Another guy on the site Paul P has a set of aluminum sportsman's that flow a little better I think and he made 530 HP out of his 406.

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