southern69chevy

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?

Haans249

iTrader: (24)

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

transAm-98

iTrader: (1)

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

99blancoSS

iTrader: (115)

It's all in the build.

Jon@Texas-Speed

iTrader: (18)

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...

99blancoSS

iTrader: (115)

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.

MAC4264

badbird

iTrader: (2)

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

southern69chevy

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?

99blancoSS

iTrader: (115)

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.

southern69chevy

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.

Stonev10

iTrader: (3)

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.

southern69chevy

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?

Stonev10

iTrader: (3)

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

southern69chevy

Awesome man. What is your hp goal?

DAVESS02

iTrader: (30)

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

MAC4264

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).

southern69chevy

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?

NHRAMAN

iTrader: (1)

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...

Stonev10

iTrader: (3)

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