vortec heads

[4thgentruck]

Well gave it alot of thought and decided to do the vortec swap. Went to the local u-pull-it found a 99' 3500 and got the heads off. The stamping is 906. Gonna slap em on my 400 sbc. Cant wait.

 

[91burb]

Have them checked for cracks. Vortecs are bad about cracking. Went thru 3 sets before I gave up.
Watch your lift anything above 450 - 470 and its a waste

 

[77 K20]

And if I remember right I think you need to have "steam holes" machined into those heads for your 400. Maybe someone else can add some detail.

 

[4thgentruck]

I got a machine shop close by that is going to do it and the motor for around 250, that includes boring if needed. But they were only 35 a head at the u-pull-it here so if they are cracked no biggie.

And I will need steam holes drilled in them. Anything other than a stock 400 head you will need to get them done.

Im also gonna have the hardened exhaust seats removed while hes got them apart for alil potring and better flow.

 

[1986K5Wa]

I've been thinking of doing this to mine. But I have a 454 L19 and don't know what heads I would need. I've seen some posted on CL.

 

[4thgentruck]

Big Blocks I have no Idea about. Maybe Hotrod can help out or another member . Im just now getting into all this.

But if its a good deal and they arent cracked or bad go for it. Im sure youll tell a big diff.

 

[4thgentruck]

Besides All you have to do is start you a thread and youll find out anything you want to know and more. Thats how I ended up doing the vortec 400 build.