Generation III External Engine LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
Sponsored by:
Sponsored by:

LS3 intake on cathedral port heads?

Thread Tools
 
Search this Thread
 
Old 04-02-2012, 09:04 PM
  #1  
12 Second Club
Thread Starter
 
Hemi2Slo's Avatar
 
Join Date: Dec 2008
Location: A small town, MS
Posts: 281
Likes: 0
Received 0 Likes on 0 Posts
Default LS3 intake on cathedral port heads?

Ok folks, I'm wondering if it is possible to do this? Has anyone tried? I'm wanting to experiment and not pay for a FAST intake. The bolt patterns on the intakes are the same aren't they?

If the bolt patterns are the same then I was thinking of trying something, rather rash. I was thinking about taking the cathedrals in the LS6 heads I have and squaring them off to line up with the LS3 intake ports. But I plan on angling the cuts in towards the inside of the intake runner so as to create a funnel effect and thus eliminate any flat surfaces for the air to impact as it exits the intake. If I'm thinking correctly, the funnel created by the angle cutting of the runner as I would do it will create a slight increase in velocity of flow as the larger amount of incoming air charge from the intake is squeezed into the runner. Has anybody done anything like this? Any ideas?

I'm sure most of you are gonna call me nuts lol. But I'm doing an LS1 so square port heads are out of the question. I don't want to pay for a FAST so I was trying to come up with an interesting alternative.

I searched, but I couldn't find anything on this. Any ideas are appreciated.
Old 04-03-2012, 10:44 AM
  #2  
TECH Addict
iTrader: (1)
 
SSCamaro99_3's Avatar
 
Join Date: Jan 2003
Location: Ballwin, MO
Posts: 2,551
Likes: 0
Received 1 Like on 1 Post

Default

I doubt this will work as anticipated. Unless you really know what you are doing with airflow, you stand a high probability of not having good results.
Old 04-03-2012, 12:24 PM
  #3  
TECH Senior Member
iTrader: (127)
 
NemeSS's Avatar
 
Join Date: Sep 2005
Location: Houston,TX
Posts: 6,886
Received 7 Likes on 7 Posts

Default

Use a ported ls2 intake.
Old 04-03-2012, 12:40 PM
  #4  
TECH Junkie
iTrader: (5)
 
redtan's Avatar
 
Join Date: May 2008
Location: Belmont, MA
Posts: 3,764
Likes: 0
Received 15 Likes on 14 Posts

Default

What are you doing to do about the bottom and top of the intake ports that will undoubtedly hang above the manifold runner?

Sure you can *try* and expand the head runners outwards to match the width of the intake runners, but the height of the head runners is greater than the height of the intake runner. What would you do about that?
Old 04-03-2012, 01:44 PM
  #5  
TECH Fanatic
iTrader: (1)
 
BigRich954RR's Avatar
 
Join Date: Nov 2007
Location: NJ
Posts: 1,193
Likes: 0
Received 0 Likes on 0 Posts
Default

will never work to many reason to even type why. have you ever seen a ls3 or ls7 intake ?
Old 04-03-2012, 02:22 PM
  #6  
TECH Senior Member
 
joecar's Avatar
 
Join Date: Apr 2002
Location: So.Cal.
Posts: 6,077
Likes: 0
Received 11 Likes on 9 Posts

Default

LS1/LS6 cathedral port heads do not have the space for squaring out the ports because the pushrod wells occupy that space.

LS3 heads use offset/staggered rockers so that the pushrod wells can be further apart allowing the ports to be square rather than tall/skinny.
Old 04-03-2012, 02:59 PM
  #7  
TECH Enthusiast
iTrader: (19)
 
taman86's Avatar
 
Join Date: Aug 2008
Location: South East AZ
Posts: 525
Likes: 0
Received 1 Like on 1 Post

Default

Well not only that but arnt the ls3 heads 11* heads, so does that change the angle of the intake ports also?
Old 04-03-2012, 05:06 PM
  #8  
12 Second Club
Thread Starter
 
Hemi2Slo's Avatar
 
Join Date: Dec 2008
Location: A small town, MS
Posts: 281
Likes: 0
Received 0 Likes on 0 Posts
Default

Well I was unaware that the intake runners on the cathedral ports were taller than the square port runners. That alone kills it.
Old 04-03-2012, 07:27 PM
  #9  
TECH Junkie
iTrader: (5)
 
redtan's Avatar
 
Join Date: May 2008
Location: Belmont, MA
Posts: 3,764
Likes: 0
Received 15 Likes on 14 Posts

Default




Quick Reply: LS3 intake on cathedral port heads?



All times are GMT -5. The time now is 03:04 AM.