Considering replacing LS6 with LS7. Can I still use the headers?

[4MuscleMachines]

I am considering all the costs associated with replacing the LS6 in my 69 Camaro with an LS7. I only cannot figure out if the LS7 oem head exhaust ports are in the exact same position of a stock LS6. I would like to reuse my headers.

Anybody know?

[WS6]

They should so long as they are 1-3/4" primaries, but the LS7 has D shaped ports and some feel that it's very important for the two ports should match

[Ralph LoGrasso]

Trey,

Doesn't the LS6 block have D shaped exhaust ports as well?

[WS6]

No, roundish port.
http://texas-speed.com/shop/item.asp...d=132&catid=40

The LS7 is clearly D shaped.

The L92 uses LS7 intake ports and LS6 exhaust ports. LS7 intake ports are more rectangle than cathedral like all the other LSx.

[4MuscleMachines]

I should be OK then. Almost all of the aftermarket C6Z headers for the 427 are round port anyway. Thanks Trey.

[WS6]

Yep, there's only like two or three companies making D port headers. The only thing else I see as a potential issue is that your headers aren't stepped to 1-7/8" primaries. That engine would really like the bigger tubes. The 1-3/4" will perform well for you though and you can always change them later if you desired. You're welcome

[ss dave]

I called SW Fri and they can make them custom, like to know who are the "two or three companies making D port headers" tho? Using Hookers for my LS7, which have the round or oval ports. Minimal encroachment on one edge and for the most part fit OK. Still looking for 1 7/8 D ports off the shelf for a 69 Camaro. Any info would be mucho appreceo.

[chicane67]

ATS was going to do "D" ports... but found out that they make NO difference in power production or efficiency.

[WS6]

The three companies are LG Motorsports, Kook's, and some American Header company. I can't remember their name exactly. They are new but are supposedly making quality pieces. Now here's the bad part. These are all headers for the Z06, nothing else. Sorry.

I tend to agree with you and what ATS found chicane. I haven't done any thorough testing or anything like that though. I just know some people are sticklers about port shapes matching up. Of course I am dealing with vette people. When they go off on the whole D port headers or not for the new Z06, I wonder how many of these vette owners went to the same trouble to get D port headers for their D port L98 cars.

I say cover the port using a quality header that's proven to make power and go down the road smiling.

[chicane67]

I tend to agree with you and what ATS found chicane. I haven't done any thorough testing or anything like that though. I just know some people are sticklers about port shapes matching up.

I say cover the port using a quality header that's proven to make power and go down the road smiling.

Well... Katech and Pratt&Miller dont think it is a necessity... so I would consider, that is all the testing I would ever need.

OK... that and the guy that built the headers for the C6R... is the same that ATS employed to design and build theirs.

[WS6]

haha yeah I had no idea that Katech and Pratt & Miller didn't make their headers D shaped. I'd have to say they know what they are doing.