ok i need help. ima bout to buy 406 short block and i have no clue what i am getting. KB flat top pistons, gm 5.7 rods, 10-10 crank, 292 comp cam and lifters with an alumnium timing cover, balanceer, and oil pump. what is the 10-10 crank and how is that cam?

 

the cam is a big cam, if i remember right, it's over .500 lift and should be a pretty rough idle.

a 10-10 crank is a crank thats been ground .010 on the main and rod journals in order to repair wear.

 

so do you think all this is worth 900 bucks? and would it be a good start on a powerful engine?

 

ok i need help. ima bout to buy 406 short block and i have no clue what i am getting. KB flat top pistons, gm 5.7 rods, 10-10 crank, 292 comp cam and lifters with an alumnium timing cover, balanceer, and oil pump. what is the 10-10 crank and how is that cam?


KB flat top pistons - keith black flat top pistions... a brand... btw unless you have a large chamber heads, you're going to have BIG compression with thoes.....


5.7 rods..... the rods in this motor were orignally made for the 350... but using the correct pistions, you can use them in the 400.

10-10 what ontogenesis said


the cam is kinda on the big side.....

from the sound of it, someone was going to build a race motor....

 

honestly? i don't think i'd personally pay $900 for it, other than the cam, all the parts are more or less stock or equivalent to stock. I can pick up bored blocks with ground cranks from swap meets all day long for $100, i can buy the rods, rings, pistons, and bearings new for $350, and the cam and lifter set for around $100...

on the other hand, since your pretty new at all of this, it might well be worth your time to pay $900 for it, I'm not saying it's not worth $900, and I'm not saying that you'd be getting ripped off if your paid that much for it. I guess it really depends on how much work you feel like you're able to do on your own.

 

eh, while i wouldnt WANT flattops, if you were planning on building a big motor, and you have the money for everything that will be needed to go with this motor, and its assembled right, then thats not bad at all.

just remember, you'll NEED good heads for that cam. good springs and the rest of the valvetrain..... you'll NEED a large chamber head..... and that basicly means you're looking at aftermarket heads anyway... so budget that in... this isnt going to be a cheap 350 rebuild... but if you want a badass motor and can afford it, its worth $900 no prob... just be aware you cant run out of money and drop some cheapie heads "just for now" on it. or anything like that.

 

yea price is negotiable and i would have to negotiate anyway since i dont have 900.....anyway thanks for the help keep it coming. i will have to pay a little more because i dont feel comfortable building on from scratch on my own

 

umm for it being ASSEMBLED its worth 900. if its in pieces, its worth less then the total of the parts new.

 

i second MrDude's evaluation, except for the large chamber part. Your gonna need good heads, about the cheapest you could get away with would be vortec's with either the new conical valve springs or a set modified from SDPC for ...i think it's .550 lift but they might be able to hold .600 *shrug*. BE SURE that the heads you choose will handle .550" lift. With flat tops, your gonna wanna run heads with good flow numbers, but your gonna wanna keep the chambers down around 64cc cuz otherwise your compression will be fairly low...

 

really, it depends how deep the piston is in the block, but compression builds quick with 400s.. heh.

im just saying keep it reasonable...

 

i'd look for very small chamber heads and dished pistons for a preformance engine. it doesn't sound like that engine is really anything special and not an exceptional price either

 

Flat tops with -5 cc for valve reliefs with .039 head gasket and 4.2 gasket bore will be around 11:1 give or take with deck height.



I think he would want 76 cc heads to bring him back near 10:1

 

having modified 2 400s with flattops in there (not my choice), i agree..


sure its nice and more efficent to have a small chambered head, but you cant stick it on that motor until you find a diff set of pistons.... or a REALLY thick headgasket LMAO.....


400s build compression alot quicker and easier then 350s or 305s.