vortec heads vs aluminum Gen 1 heads
12-23-2014, 05:53 PM
#1
Instructor
Thread Starter
Member Since: Jun 2013
Posts: 107
Likes: 0
Received 0 Likes
on
0 Posts
vortec heads vs aluminum Gen 1 heads
I have a set of vortec heads with the cast number 10239906 which means I get 20% less exhaust flow would I be better off using these head or trying to get a set aluminum heads. I'm ordering a XR270HR cam and springs so what would be my best bet
12-23-2014, 08:16 PM
#2
not all 906 vortecs flow bad on the exhaust.
Take a carbide bit on a die grinder and open up an exhaust seat, if it makes a dark orange spark it has the more restrictive exhaust seats. Not all 906's had them.
Even if you have the hard seats a machine shop can open them up or machine them out and install regular seats.
Take a carbide bit on a die grinder and open up an exhaust seat, if it makes a dark orange spark it has the more restrictive exhaust seats. Not all 906's had them.
Even if you have the hard seats a machine shop can open them up or machine them out and install regular seats.
12-23-2014, 08:33 PM
#4
Le Mans Master
http://www.superchevy.com/how-to/97458/
This will answer some of the questions, not all. Beware of high lift cams with Vortec heads.
This will answer some of the questions, not all. Beware of high lift cams with Vortec heads.
12-23-2014, 08:41 PM
#6
From the super chevy article....
It says SOME 3/4 and one ton trucks. Not all 906's have poor exhaust flow.
For you junkyard hunters, be forewarned that some ¾- and 1-ton trucks came with Vortec heads equipped with a specially hardened exhaust seat that kills low- and mid-lift flow. Casting number 10239906 should be avoided.
12-23-2014, 11:03 PM
#7
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
Have them magnafluxed before you put any money into them
Gotten those to flow fairly well takes a little work in the right places.
Real nice combustion chamber they need a little less timing in them, do you have an intake thats compatible wiht the vortec bolt angle?
Gotten those to flow fairly well takes a little work in the right places.
Real nice combustion chamber they need a little less timing in them, do you have an intake thats compatible wiht the vortec bolt angle?