Gto exhaust manifolds help

[not2oldchevy]

Have a 53 AD with a 5.3 I am trying to use factory manifolds. Tried stock truck they were about 2 inches too wide on each side. Bought some 06 GTO manifolds, they were about 1/2 inch too wide, already boxed the frame so I don't want to notch it. Anybody got any suggestions? Got plenty of manifolds I don't need! GTO manifolds look like they would flow super good but I don't want to notch.

[Larry Lindley]

I used factory manifolds,but had to notch frame,then later I switched to Hooker LS headers for 55-56 chevy car.

[not2oldchevy]

Originally Posted by Larry Lindley

I used factory manifolds,but had to notch frame,then later I switched to Hooker LS headers for 55-56 chevy car.

Block hugger or full length?

[Super73]

C5 Z06 manifolds? Tri-Y design and fit a bit tighter to the block.
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[Larry Lindley]

I used the full lenght ones,Hooker also make LS cast iron headers that tuck in tight,check Summit Racing forgot the part#.hope this helps.the corvett Zo6 is another try Ebay,or there site vendors that can help.

[Daaaanz67]

Check out my post "FYI hookers" the new cast iron manifolds.
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[BR3W CITY]

I got tbss, fit pretty darn good. Only thing I would change to is long tubes for performance if i redo the rest of the exhaust in stainless.

[nacho55]

I have a 5.3 in my AD truck, with an S-10 Front clip, and if you are handy with a welder you can cut off the factory flanges from the cast iron manifolds and weld on a a different collector,(yes you can Mig weld cast iron if preped right) i used some steel v-band flanges and clamps and worked out good for mine, a person could also weld on a bend or elbow in a different position and put on a different collector on to be routed a little different to get you the clearance you need.
Just something to think about,

[BR3W CITY]

^^even better if you want to flip them to run as turbo manifolds.

and heck ya you can weld cast....just gotta cook it in the oven first