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2004 chevy trailblazer_lt
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419 Posts
Discussion Starter · #1 ·
I know there is not a huge market for the 4.2 just wondering what else i can i do to get more power we have a intake spacer and exhaust and planning on a tune here shortly i hope is there anything else i can do for more power???:hopeless
 

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gmc
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830 Posts
Thats basically all we can do right now with out 4.2 engine:mad:. Unless you have a few thousand dollars to drop for a custom turbo install along with trying to tune it.
Not quite right. As a true bolt on your correct.

What can be done is basic hot rodding - port the cylinder head especially the exhaust ports and camshafts.

I have done both, with lower compression (8.2:1) than stock 10.1:1 I made 353 HP on a '06 engine at 6700 rpm.

With stock compression this would be even more power.

Cost wise it your can do the installation work yourself:

head - roughly $900 including a good 3 angle valve job

cams - cam blanks $570 + 500 for finish grind. (or 400 + 500 if we get 20+ people on the group buy now underway).

Add a re-tune on top to optimize the install.
 

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2003 gmc envoy_slt
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8,149 Posts
Just an FYI, the spacer is pretty much useless. The fuel doesn't go through the t-body so the spacer doesn't do anything. Just like the Tornado.
 
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