Ported exhaust manifolds

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Mar 25, 2005 | 11:48 AM

#21

banned3800

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Quote:

Originally Posted by big_news_1

Quote:

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.

Yeah, I agree with you here.... my argument is headers vs. PEMs. I'd take headers over stock manifolds any day of the week, but with my mods I have to wonder if PEMs would be a better overall match for my L36.

I'm going with them due to cost, and I'm just looking to flow slightly better and for the reason that the stock untouched manifolds are horrid... When I get the manifolds I'll have to snap pics of the stock and modified manifolds..

... If I had an L67 to play with I'd be all over a set of Headers....

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Mar 25, 2005 | 12:20 PM

#22

Sol

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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.

Mar 25, 2005 | 12:39 PM

#23

banned3800

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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.

I'm NA'd.... But I do want a set of 1.9 rockers...

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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Mar 25, 2005 | 01:02 PM

#24

Sol

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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.

Mar 25, 2005 | 01:15 PM

#25

banned3800

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Originally Posted by Sol

Being that I have a 95, it would be interesting to know how muxh the PCM actually does... Too bad its a Bastard PCM... But the EPROM program I think was used just for 1995 L36.... The same chip was used in 94 but with the L27... I'm just wondering what the programming diffrences may be between the 95 and 96-97 models...

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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Mar 27, 2005 | 01:33 PM

#26

macho_mike21

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From: Bloomington-Normal, IL 1997 SE

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.