Questions about vortec 350

BIGDOGG

Amateur Racer
Nov 26, 2008
131
0
0
gobles mi
Just wondering why the vortec is such a good motor. Are the internals better are they 4 bolt blocks, forged parts. Is the motor a full roller anything would help thanks.
 

SSedan64

Dragway Regular
Oct 5, 2009
948
0
0
MACON, GA.
They do have a Roller Cam as well but, as said above the Heads are where the HP/TQ comes from, Kidney shaped Chamber & raised Intake Runners.
 

doolin

Daily Driver
Sep 9, 2011
11
0
1
Calgary, Alberta, Canada
Here is what I found having 2 engines, 1 from a 1/2 ton and 1 from a 3/4 ton:
3/4 & 1 ton trucks got a 4-bolt block with the good PM rods, the 1/2 tons got a 2-Bolt block, the connecting rods in the 1/2 ton and 3/4-1 ton engines I had were very different, I suspect the the HD truck rods were from the LS1 but can't confirm because the part-no.'s in the catalog are the same no matter the weight of the truck. I can only tell you what I saw. All blocks were roller camshaft, no roller rockers. The quality of the crankshaft is unknown to me from a production point of view.
There is tons of info about the heads on the interwebs, the older articles tell of all kinds of machining to accept a high lift camshaft, but this issue has been addressed (within reason) with the use of the newer LS "Beehive" valve springs. The Vortec heads also use a different bolt pattern regarding the intake manifold, 8 tiny bolts vs. 12 larger ones. There are 2 casting no.'s both are fine from a street point of view, the 906's had hardened exhaust seats the allegedly flow less at high RPM, the 062's came on 1/2 tons are the "better" of the two.
 

Doober

Moderator
Jun 2, 2003
14,704
1
38
Catalina, AZ
www.cardomain.com
Also another note, engine lift points are different from older heads, they aren't lifted by the intake bolts anymore, rather brackets on the block.
 

MalibuRacing.com Gear

Stickers & Shirts!!