How long do your 408's last?
 

Ok so I heard that 408's don't last that long. I was wondering how long some of ya'lls gave lasted. So how long have some of ya'lls lasted before you had to rebuild them, and what went wrong?

If they are built properly, maintained properly, and tuned properly, then they will last indefinitely.

I don't see any reason why they would go prematurely if built properly and tuned right.

It's all in the build.

I don't know that it's all in the build, but a good quality build definately helps. We have a customer in Dallas that has nearly 80k miles on one of our 408 iron blocks & he still makes great power & sprays it all the time!! :) :)

The 408 iron block can definately have a long life when taken care of & built properly. It's probably my favorite motor for the money...

Well I definatetly agree you need to take care of it as well...LOL
As Jon said its great bang for the buck and if constructed properly and tuned correctly its a great long lasting motor.

:corn:

mine lasted about 300 miles, but it wasnt even close to being done right.

See I thought the same, if they were built properly and well maintained. I have a buddy of mine that built one and blew it. I don't know what happened, but I do remember he was spraying it but don't remember how big of a shot. He was the one that told me they don't last long. I just think it left a bad taste in his mouth lol. Do the 408's hold pretty good with forced induction?

Honestly its one of the better choices for FI. We do a lot of FI and N2o builds, the 408 is as solid as you can get. The only thing I like better for extreme FI is our LSX 434. And then its only for the displacement.

Cool. I was thinking about building a 408 with a Magnacharger. The reason I want a magnacharger is cause I'm an ol' school kind of guy. I love roots styles plus they just sound like sex lol, Plus they make Earth breaking torque.

I was thinking along that way also....know idea of the power it will make, but it should be fun. I also need to find a hood to fit.
http://photos.imageevent.com/sbmotor...e/DSC01443.JPG
http://photos.imageevent.com/sbmotor...e/DSC01455.JPG
http://photos.imageevent.com/sbmotor...e/DSC01456.JPG

Man that motor looks sweet. I would leave the hood off so everybody could see that sexy thing. What kind of head are you running?

AFR225's 72cc
Futral F-9 Cam
Magnacharger 122 Overdriven 92mm
TSP 408 -10cc pistons

Awesome man. What is your hp goal?

Is there anything other than bearing clearances, or piston clearances that is a commonly seen problem with the ones that dont last?

Read my thread started a few weeks back "4.00 stroke/potential piston rock".
I have done many searches and read my threads on 408 (4.00 stroke) engines on here. I notice that most people that seem to be having success with this setup all have CUSTOM pistons. Now there are a few strays that have shelf pistons with great luck. You also will find that most on here will not admit there is a potential problem with this setup and they have never had a issue one with it. I guess some of us are not perfect and willing to admit and learn from mistakes. In other words I don't care what shop you are or how many of these you have built but at some point everyone has built a lemon 408 (4.00 stroke motor).

Ah that's what he was saying. He said they have to big of a stroke or something like that. So what would be the best piston?

That is the newer smaller Magnacharger,,,but better than the larger one..isn't it..?? I saw a show where they where talking about the 122...:nod::confused:

The 122 is the larger unit, the smaller Magnacharger used on the GTO set-up was the 112.