Itoyota

After 150,000 miles... the headers on the I-Force V8 engines are likely to develop a stress fracture due to metal fatigue on the thinnest most vulnerable portion of the poorly designed headers, the collar from header to head.



I WILL NOT INVEST in another poorly designed header. Toyota will not take 500 dollars from me for this shoddy engineering.
Does anyone have any suggestions for a better, quality aftermarket header?

thanks,

Cargun

150k? Don't be too angry, it seems that a lot of people have them crack under 100k. I think JBA makes a set, check over at TundraSolutions to see what people are doing.

Itoyota

under 100K! now that's just downright not toyota. Well i wont get too mad. I decided on some aftermarkets by Holley. Two for 1/4 the price the dealer wanted for the in stock inventory.

Cargun

Report back on how they work, how easy they were to install, etc. I'm going to have to start doing some work on my dad's Sequoia as he'll go broke paying the dealer to fix it. $3000+ in the last 40k miles.

IMO, nothing on any vehicle should fail under 100k. Reality, I don't know of any vehicle that has gone 100k trouble free. It seems a lot of people hold Toyota to such a high standard that they can't possibly meet expectations. Every Toyota product that I've owned when the odometer rolled 100k has needed repairs before that point. If you think it's going to be bulletproof or feel that you're guaranteed to have fewer problems than a buddies Ford/Chevy/Dodge, you're just setting yourself up for disappointment.

The 4.7's tendency to crack exhaust manifold's is NOTHING compared to the 3.0 V6!

Itoyota

I gotta disagree with ya. This family has gone through a toyota 22re to 110 w/out a hitch. Not even timing chain guides till then. Also taken a VW Beetle AEG SOHC to 100,00 before the HG blew. Dummy lights don't actually work for dumb people. And this Sequoia now reads 153,000 and this is the first major work other than the scheduled timing belt at 90K. If you get to pull the headers off on this vehicle, i think you'll agree. The design is terrible. Hands down. Never owned a 3VZ, my pickup's a 4 banger.

Itoyota

The job was difficult. The engine bay has minimal space to work with and removal of stock manifolds require impact tools and swivel sockets. Even with 150psi compressor, Two studs would not come out after liquid wrenching overnight and required heating with oxy acetylene torch. Good luck on anyone elses attempt. You'll need it.

PS. Holley Flowtech headers are a good buy. 1/4 the price of OE headers and twice the kick. The design has enginered out Toyota's flaw in flange thickness, so another cracked header because of flange thickness won't be a problem.