Thread: Cracked Exhaust Manifold

I have seen several threads on cracked manifolds lately, I think it's a common problem with the manifolds themselves.

Originally Posted by thebigcanoe

I have replaced the front exhaust manifold three times and noticed it is cracked again after only a few months. I checked the exhaust ports on the head with a straight edge to see if it is warped but it looks straight. Any ideas on why this keeps cracking?

buy headers, no more cracks to be had.

Honestly the one time I had a cracked (Series I) manifold, I hit up a JY. Cheap and easy.

I've never come across a cracked SII manifold. Seems very odd. Are the splash shields in the wheel wells? Being a wifes car.. she likely takes every cold puddle straight on... lol

Splash shields are in place. However the front spoiler was eaten by a curb and is missing. Its possible that water could splash up on to the front of the engine. I have not seen any evidence of water on it to wash all the dust off. I attribute it to either cheap castings from after market suppliers or binding in the exhaust crossover not allowing the manifold to expand. IDK, tired of replacing it and the smell of exhaust in the cabin.

I'd try another brand.

I love dorman parts but I guess some things just won't hold up. We've used dorman manifolds on many GM trucks in the past at my work but havent had any comebacks for those yet.

i have my old OEM front manifold... if interested pm me