C4 LS1

Is it possible to run a square port gmpp intake on cathedral port heads. The intake and gasket completely cover the cathedral port heads so there would be no leak in between them but what might be the consequences here?

Doug G

Maybe...but why ????

It would cause a lot of turbulence, and effect combustion also since the air will be choked.

C4 LS1

The reason is because I have a gmpp intake and it is square ports checked on summit racing and it just says its for ls1/6 with no option of a square port or cAthedral port....

Here's the part
http://m.summitracing.com/parts/nal-88958675/media

ZONES89RS

iTrader: (25)

I am thinking the intake bolts will not line up.

MikeFSKSpeed

iTrader: (37)

Besides the intake bolts not lining up there would be alot of turbulence.

Reminds me of guys who ran Oval Port BBC intakes on big Rectangle Port Heads claiming it increased runner velocity. Cant run the opposite though because the air hits a wall

onefast84

That intake is for a cathedral port. I have the same one. The ports are square, because the top of the cathedral is where the injector goes for fuel injection.

chrisgonz29

I believe it won't line up

Prorac1

iTrader: (4)

Yeah, that intake in the link is a cathedral port. It should bolt up to cathedral port heads with no porblem. Eric L

C4 LS1

That is a relief to hear that! So then mounting these up will not create the airflow turbulence like I thought?

67RS/SSx2

The "square" part is "square bore", not square ports (as in heads). This is referring to the square bore carb flange. Has nothing to do with head style.

C4 LS1

Right I know what the square bore meant in relating to the carb base flange but that was not my issue I thought it was just the wrong shaped ports but that was not the case. Well I slapped on the intake today and it looks pretty nice. Thanks for clearing things up with this whole situation I can't wait to get her running again

team39763

iTrader: (3)

I just noticed my Vic Jr ports don't line up very well with my 243's ports. Head ports seem too small. Definately gonna have turbulence. Anybody else notice that?

Blue Knight

iTrader: (4)

YES!!! I just made a thread on this on yb..


http://www.yellowbullet.com/forum/showthread.php?t=547784

speedtigger

iTrader: (16)

There is a little bit slop in the bolts to allow you to move the intake forward or back to get it close. If the heads and the intake are unported, it will likely make no real measurable performance difference. If the heads or intake are ported, then it is important to do a match port at the minimum. However, it is really important that you know how to do a proper match port. Here is a thread on my technique for maintaining proper alignment when match porting:

https://ls1tech.com/forums/generatio...ted-heads.html

Storm Trooper

iTrader: (11)

Sorry to bring up this old thread but what if it was the other way around? Cathedral Port FAST intake on LS3 Heads??

ZONES89RS

iTrader: (25)

It would be goofy alignment of the bolt holes even lined up and I doubt it would seal.

wildcamaro

iTrader: (15)

Not good storm trooper; even if it bolts up it will run like ****

Storm Trooper

iTrader: (11)

Alright, thank you gentlemen!

ridnhood

Bolt holes line up perfect.. According to my super Vic and gmpp ls3 intakes. Just sayn..

ZONES89RS

iTrader: (25)

Of was supposed to be if. I had no solid statement on it. Interesting to know.