Ported exhaust manifolds
#21
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Originally Posted by big_news_1
Originally Posted by 1997_LeSabre
Are you kidding, the Series II n/a manifolds are so crappy and mismatched, headers would be a big performance boost. You will probably gain low end if anything due to better scavenging.
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#22
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I decided against headers because I want to save my money for other things ... like rockers.
My top end improved greatly though. I got a chance to see for myself last night on the drive home across Michigan.
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My top end improved greatly though. I got a chance to see for myself last night on the drive home across Michigan.
#23
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Originally Posted by Sol
I decided against headers because I want to save my money for other things ... like rockers.
My top end improved greatly though. I got a chance to see for myself last night on the drive home across Michigan.
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My top end improved greatly though. I got a chance to see for myself last night on the drive home across Michigan.
That should give me an intake lift of .475 valve lift with the .250 cam lift
and for the exahust I should have roughly .485 exahust lift with the .255 cam lift..
stock is .400 intake and .408 exahust...
So .475 intake and .485 exahust is more than I need...lol
The question is would the stock PCM be ok with these mods? I'm hoping so... Those would be about all the mods I'll do...LOL
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#24
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Definitly. Opening up the exhaust and intake without messing with the cam or the size of your TB, or any other hardcore stuff, will be fine for the PCM. However, an aftermarket PCM can tweak those upgrades.
#25
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Originally Posted by Sol
Definitly. Opening up the exhaust and intake without messing with the cam or the size of your TB, or any other hardcore stuff, will be fine for the PCM. However, an aftermarket PCM can tweak those upgrades.
But if I can leave that alone I'll be happy... Once I get the mods done if I manage 20 hp and a little better effiency, I'll be a happy man...lol
I really want to see these ported manifolds in person... Should be coming soon..
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I would like to see how they stack up on an L36 NA. It is really too bad that GM didnt put in that quality header from the start, seems like that little difference could have made the L36 a better engine when they needed a cheap way to boot up the HP ratings.
#27
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Mike I should have them on the 31st.... But I don't know when I'll find the time to snap pics... But I will do it soon.. ![Wink](https://www.gmforum.com/gm/images/smilies/icon_wink.gif)
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