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Old 10-10-2009, 06:15 PM   #1
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TPI/ZZ4 Question
is the tpi system a good choice to install with ZZ4 heads and a zz4 com cam?
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Old 10-10-2009, 06:36 PM   #2
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Re: TPI/ZZ4 Question
If your CR ends up the same. ZZ4 heads makes your engine the same as a Vette L98 TPI with alum heads.
ZZ4 cam worked great for me but likes intake mods; big tubes , ported plenum and base to get the best out of it
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Old 10-10-2009, 07:41 PM   #3
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Re: TPI/ZZ4 Question
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Originally Posted by vetteoz View Post
If your CR ends up the same. ZZ4 heads makes your engine the same as a Vette L98 TPI with alum heads.
ZZ4 cam worked great for me but likes intake mods; big tubes , ported plenum and base to get the best out of it
what intake mods and parts do you recommend? My intake is stock right now
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Old 10-10-2009, 10:02 PM   #4
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Re: TPI/ZZ4 Question
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Originally Posted by reese_galmon View Post
what intake mods and parts do you recommend?
As I listed .A aftermarket big tube setup or port your own

http://www.thirdgen.org/techboard/po...545-post3.html
http://www.thirdgen.org/siameseport
http://www.cis.udel.edu/~davis/z28/buildup/plenum/
http://www.digitalcorvettes.com/foru...ead.php?t=1793
http://sethirdgen.org/TPIbase.htm
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Old 10-12-2009, 08:18 PM   #5
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Re: TPI/ZZ4 Question
You said if my CR is the same I'm a beginner at this can you explain this to me?

These are the heads I wanted to put on my 1990 Firebird 350
http://www.jegs.com/i/GM-Performance...oductId=955894
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Old 10-12-2009, 11:23 PM   #6
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Re: TPI/ZZ4 Question
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Originally Posted by reese_galmon View Post
You said if my CR is the same I'm a beginner at this can you explain this to me?
CR = Compression ratio .Heads have different sized chambers .
I believe L98 w/ iron heads is 64cc so the 58cc head will raise your compression somewhat

Also consider
Needs new intake to match but it is a big port intake saving you having to do the intake mods
Read http://www.thirdgen.org/techboard/po...938-post3.html
http://www.summitracing.com/parts/NAL-12558060/
http://www.sdparts.com/product/E3817...nderHeads.aspx

or these @ $1000/ pr
http://www.summitracing.com/parts/TFS-30300001/
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Old 10-13-2009, 01:26 AM   #7
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Re: TPI/ZZ4 Question
thanks a lot I'm going to go with the trick flows
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Old 10-13-2009, 01:26 AM
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