emmanuel606

hey guys need some serious help i got this 350 small block carbureted engine on my 350 which has a lot of leaks so i have planned on rebuilding or overhauling the whole engine. while in the process im planning on upgrading it a bit for a little power . so far researching a lot on the net i have found out that i could get some used gm vortec heads and slap them on with some newvalve and rocker arms on the block and gain some good power i also plan on changing the cam but really confused about them any help with all this would be really cool and ya im newbie here so hi guys please help me out .

Jonesyfxr

iTrader: (2)

Vortec heads are a good start, but if you want a better cam the heads have to have work done to them, in order to handle valve lift and duration of a performance cam.

The first thing I always tell people when they ask about building an engine is this......

What's your budget?

Then you can be guided in the best bang for your buck.

emmanuel606

well im in saudi so basically here a normal small block engine is completely overhauled for 900 dollars including the stock spares

emmanuel606

budget is not an issue and the thing is this is gonna be a daily driver so i jus wanna get around 350 to 400 horses out of it and drive it daily without any issues

emmanuel606

well getting stuff for this cars performance is hard and finding people with all that engine knowledge is hard

Jonesyfxr

iTrader: (2)

Does summit racing ship there?

emmanuel606

i had decided to give the car for overhauling this month were they would take the whole engine apart replace everything brand new but stock jus the heads would be from a gm vortec and im gonna give it for cleaning and polishing and stuff and then replace the intake with a gm vortec intake manifold also
would that give me some gain in the horses

emmanuel606

yup summit racing ship herebut they cost a bit its ok though

emmanuel606

holley street avenger carb 670 cfm , morroso advance curve kit ,summit racing street and strip stage 3 inatke manifold thats what i had put on my cart from summit but havent ordered it yet jus wanna be sure if this would fit or not

Jonesyfxr

iTrader: (2)

If the heads are off a truck they aren't the same as the Vortec car heads. They are actually worse than your stock heads. Just because they are center bolt heads, doesn't mean they're the good Vortec heads.

Jonesyfxr

iTrader: (2)

Look here....

http://outintheshop.com/faq/casting/heads.html

sofakingdom

iTrader: (1)

Ignore that last post.

There's no such thing as "Vortec car heads"; the ONLY "Vortec" heads are off of trucks. 96 - 2000 model ones with the 350 to be specific. The casting numbers are 906 and 062. No other casting numbers are "Vortec", so accept no substitutes, no "almost as good as", no "early Vortec", no (my personal favorite way of sliding the buzzword in without actually lying) "pre-Vortec". They're easy to spot because instead of having 6 bolts on each side, they only have 4 (2 at each end, around the water passages), which are straight vertical instead of being at the same angle as the head surface; and, the intake ports are about ¼" higher up on the head, toward the valve cover, than on older heads.



You can see in the picture how different the intake port location is; and, where somebody attempted to graunch a normal intake onto the Vortec heads by drilling the old bolt pattern in the heads, and you can also see the 2 CORRECT bolt holes, located kind of up higher and a little farther apart.

Yes they will give you more HP than any other stock heads, all else being equal.

emmanuel606

ok so i can get it on my 350 small block thats a relief well would i have to run some different cams for this if so any specific u can suggest im jus looking for 350 to 400 horses. i suppose they used these head on early suburbans thats wat i heard so if i get them i should be getting the intake manifold for these also from the same vehicle right sorry im asking too much jus newbie to these stuff

sofakingdom

iTrader: (1)

Doesn't matter if it's a Suburban, Silverado, or even a van; they all came with the same motors. "Early" means different things to different people so leave that out of the description. Go by the date and source, then verify by casting number. Either they ARE those heads, or they ARE NOT. No in-between.

No, you don't want the intake that came with them. It is specific to a particularly unsuitable fuel injection system called CPFI. You don't want it.

Those heads typically run best with cams that have a substantially larger exh lobe than int lobe. Reason being, the shift in the port location gave the INTAKE side all this TERRIFIC FLOW, by way of straightening out the port to give it a more direct shot at the valve; but, the exhaust port is the same sucky design as any other stock exh port. Using a larger lobe on that side acts as a "crutch" to help all that stuff that managed to get INTO the cyl via the wonderful intake, get back OUT through the restrictive exhaust. Cams like the Comp XE and Lunati Voodoo series are perfect for them.

emmanuel606

well i was hoping to go with a cam comp cam shaft with intake being 215 and exhaust 224 do you think thats a good descision and wat do i do about the intake manifold

emmanuel606

sorry intake 214 AND exhaust 224

emmanuel606

if anybody could point me with the right cam with the right intake and exhaust for this setup it would be great.

Juan_Garza

iTrader: (1)

Get the lt4 cam