I want to swap a 5.3 to a 6.0 LQ9 and run either a 408 stroker or a 6.0 and eventually port the heads. I currently have dynatech supermaxx LT's on my stock 5.3 aluminum head. Will there be any problem in using the same LT's with either the 6.0 or 408, ported or not ported? If there is a problem with fit or port alignment, maybe a possible fabrication? Those LT's were kinda pricey to just dump with a swap. I contacted dynatech and they said the headers should bolt on to the heads but the ports are different. Has anyone tried a swap and used the same LT's? Any help would be great. Thanks.

 

I had wondered the same. I found out that everything from a 5.3 will bolt back up to a 6.0.
Derek

 

I heard that too. I think their headers are the same but from the Headers back they may be different, since they list their headers for the 4.8, 5.3, and 6.0 under the same product number but have different whole system product numbers. Anyways, I love the way they sounded when I installed them, especially past like 3500 RPM's. I did break off a head bolt when I removed the stock manifold but hopefully I can get that taken out somehow and get the last bolt in. No noticeable exhaust leak though.

Still wandering if I am going to have any problems with the swap, especially if I port the heads with the 408 stroker. Anyways, here is their webpage:

http://www.secureperformanceorder.co...ore/truck.html

or

www.dynatechheaders.com


This is what is listed on their website for the part I ordered:

PRODUCT: 115-841310

99-`05 GM Truck 1500, 2500/ SUV (4.8L, 5.3L, 6.0L)

Fits 00 - 03 Chevy/GMC 1500 and 2500

Fits the following SUV applications
Avalanche
Escalade
Suburban
Hummer H2
Tahoe
Yukon and Denali

Here is for the 6.0 system:

PRODUCT: 115-841350
99-`05 GM Truck/ SUV 6.0L Header System w/o Air Injection

Long 1 3/4” Tube Design
Increase HP & Torque
Improve Economy
Direct Bolt-On Fit
Model fits with and without EGR
For ‘00 -‘03 6.0L

Hummer H2 (6.0L)
Silverado SS (6.0L)
Cadillac Escalade (6.0L)
GMC Denali (6.0L)

 

You should not have any problems.

 

yup, my 4.8 and LQ9 manifolds have the same casting number IIRC. I'm running 4.8 manifolds

 

You sure can! Lots of people run that setup!

 

I moved my dynatechs from my 5.3 to the 6.0!

 

Question on the Dynatecs, are these a direct bolt on where thhe stock tubing is not cut? Think of getting these. THX

 

yep..direct.

 

yea it will work. 1slow01z71 is running dynatechs on his 418.