heads and Intake Questions

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Jul 30, 2010 | 10:24 PM

1evilss

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heads and Intake Questions

Whats up guys.....I see alot of people with a 4' bore running 243 casting heads along with a ls6 intake....Why not run the L92 heads and L76 intake and take advantage of the flow/cubes? Does it really not matter when your running boost? My question is...I have a 402 built for boost and I plan on running around 15-20psi. So do I buy the L92 heads and L76 intake or do I use the same 243 heads and Ls6 intake that I already have on my 346? Also do heads and intake really matter on a boosed car?

Jul 30, 2010 | 10:29 PM

SaultysHuggerSS

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From: Flint

I wouldn't say it matters that much unless your running alot off boost then a tin intake or Vic jr would help with the intake not blowing up

Jul 30, 2010 | 10:40 PM

1evilss

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Ya it just kinda threw me off people were not taking advantage of the better flowing heads and intake....You would still pick up good power with the heads and intake right?

Jul 31, 2010 | 12:57 AM

98Z28CobraKiller

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Depends on how you look at it. It'll take less boost to make the same power but they will lift at roughly the same power level.

Jul 31, 2010 | 01:21 AM

TurboAv

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I thought the LS3/L92 heads lifted earlier than the cathedral port stock casting heads? Edelbrock also has a rectangle port Vic Jr now. Just saw it on Summit tonight.

Jul 31, 2010 | 09:13 AM

Tzion_ben_Arthur

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Quote:

Originally Posted by 98Z28CobraKiller

Depends on how you look at it. It'll take less boost to make the same power but they will lift at roughly the same power level.

I agree with this... I made more power at 12 psi on the LS3/L92 heads than at 17 on my older ported 243... However... I am not sure I would push the the LS3/L92 heads to 18 for a sustained period. I am arp and 7 layer gaskets and I still do not trust them to big boost.

Jul 31, 2010 | 09:21 AM

Tzion_ben_Arthur

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From: Broken Arrow, OK

will, I forgot to write that I installed a vic LS3/L92 intake at the same time.

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Jul 31, 2010 | 09:34 AM

Shawn @ VA Speed

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the l92 head is not as robust of a casting-it will lift much sooner on boosted engine-about 750hp is the max without problems.

Jul 31, 2010 | 09:40 AM

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98Z28CobraKiller

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From: WPB, FL

Quote:

Originally Posted by TurboAv

I thought the LS3/L92 heads lifted earlier than the cathedral port stock casting heads? Edelbrock also has a rectangle port Vic Jr now. Just saw it on Summit tonight.

Earlier power level and earlier boost level are 2 different things. So let's say that stock heads (LS3 or cathedral) are good to 1000 rwhp before they push. So to make the number with a cathedral port stock head, let's say it takes 25 psi. Throw on a LS3 head/intake combo and now to make 1000 rwhp, you only need 20 psi but either way, it takes X cylinder pressure to make the rwhp number and that is what is lifting your heads.

I pulled these nice round numbers directly out of my *** for illustration purposes so please don't quote them.

Jul 31, 2010 | 10:23 AM

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1evilss

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LOL....Ya im new to this whole turbo set up I have always tried to stay all motor but people are getting to fast and im not getting left behind. Thanks for the info guys, so it sounds like L92's and the L76 is the way to go...I also thought about the edelbrock but I dont wanna cut anything....Unless there is a way to get it to fit that I have not seen yet?

Jul 31, 2010 | 11:52 AM

#12

98Z28CobraKiller

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Quote:

Originally Posted by 1evilss

I think you missed the point. Shawn has bunches of experience with this raised port stuff, whereas I have none. They pushed Vee8's car pretty hard with the L92s AND orings. Again, the numbers that i used were just to illustrate a point. Maybe I wasnt clear in making my point. Why buy heads and intake when the stuff you have can make the same or more power regardless of what the boost # happens to be to get to that POWER level? It's a waist of cash basically to put it bluntly.

Aug 1, 2010 | 11:57 AM

#13

1evilss

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Ya I understood you, I currently have milled 59cc ls6 heads so those wont work and I can pick up the L92 stockers alot cheaper than another pair of Ls6 heads as for the intake I many keep that if its all the same...I just was thinking it would choke it up. Thanks for the help 98z28cobrakiller

Last edited by 1evilss; Aug 1, 2010 at 01:02 PM.