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Reply With QuoteYes. just be aware of what your new compression will be with the 64cc heads
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This is a discussion on TBI -Vortec within the Performance forums, part of the General Discussion category; Hey guys, I got a question. I'm thinking about putting vortec heads on my 89 5.7L 350 TBI. I know ...
Hey guys, I got a question. I'm thinking about putting vortec heads on my 89 5.7L 350 TBI. I know I will also need a intake for these. What all will I need to complete this and also is it really worth the time and money. Thanks!
Yes. just be aware of what your new compression will be with the 64cc heads
Here is the Vortec intake you will need for your TBI:
http://store.summitracing.com/partde...5&autoview=sku
08 HHR LS - 2.2 | 5 speed | 30 MPG
98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG
84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt
The same considering that the stock LO5 193's are 64 cc chambers as well.Originally Posted by 04SilveradoMykk
You may as well do a cam at the sametime to take advantage of the heads and a tune. Even the stock TBI setup benefits greatly from a cam swap and a tune. Cams are like @$$holes, everyone has an opinion. Figure out what you are truly after and go from there.
JUST FOR CLARIFICATION
I hate GMT900 trucks period.
Sorry to but-in .I have a 89' TBI as well,just recently did a comp cam kit change but have come across Votech heads for cheap.I know I need an intake,but will I bee able to use my shorty headers?Also what about my comp cam,can I keep it or will they not work with Vortech heads?
Since your in California you probably still want to pass smog I assume. The Vortec heads have no EGR passages and need an EGR pickup tube from one of the manifolds, or in your case, headers. So you need to add a pickup tube on one header or the other or ditch the EGR. That latter is no real benefit to you and you will definetely fail then.
Generic "will my cam work" mean nothing. What cam, there is more than one camshaft for Chevy small block V8's made by Comp you know. If it worked with the stock springs on the TBI heads it will do the same on Vortec's. Beyond about .450 lift stock Vortec heads need springs. Much higher and you interfere with the stock valve guides and they need to be machined down. If the heads have any real amount of miles on them I would do springs anyways. Inexpensive insurance over dropping a valve.
Last edited by Badass69; 03-12-2009 at 11:56 AM.
JUST FOR CLARIFICATION
I hate GMT900 trucks period.
Sorry about that.I went with comp cam 12-205-2(206/206-.425/.425)800-4800 RPM.
Since I kept the TBI heads I figured it was a good cam to go with.Have 1.5 Summit roller rockers in them with camaro valve springs.The Vortechs have 89 thousand miles on them.Thanks for the help Badass69
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