When did GM start using Vortec heads?
When did GM start using Vortec heads?
The Vortec line of cylinder heads was introduced by GM in 1988 as a V6 with a 4.3-liter displacement.
When did GM start using Vortec engine heads?
From 1996 to 2000, GM truck and van 350 engines came equipped with L-31 Vortec cylinder heads. Built of cast iron, these powerhouse heads upped the horsepower of these engines by magnitudes. This is primarily attributed to the high port flow in the.300”-.500” valve lift area, wide bowl, and back-cut intake valve and exhaust.
How many versions of’vortec’heads are there?
How many versions are there of ‘Vortec’ heads? L-31 Vortecs — there are two castings with two versions of one of these castings (#906). The two castings are the #062 and #906. The #906 is the same as the 062 with the exception as noted below.
What’s the difference between Vortec 350 and 350 heads?
The bolt pattern and the number casting is the quickest way to differentiate a Vortec Head from a regular 350 head. The Vortec head is available in two casting numbers (10239906 and 12558062) that offer identical performance virtues.
What are the casting marks on a Vortec head?
You can also check the casting mark on the end of the head and check for three triangular saw-tooth casting marks that indicate Vortec potency. The intake valve seat of the Vortec head has a three-angle grind straight from the factory and the combustion chamber design is a radical departure from former GM heads utilized in the market.
What was the biggest change in GM’s Vortec heads?
The biggest change GM made in the new design was revising the water jacket so the new Vortec heads could be used on conventionally cooled small-blocks. The idea of using the 1996 LT1 cast iron head as a starting point for a new performance stock head came from the fact that it was the highest flowing LT head used by GM.
Are there any Vortec cylinder heads that still work?
Vortec cylinder heads have been around for over 20 years and are still a great option for a performance small block build. There have been many tech articles written about them over the years, so I won’t get to far into the weeds about the improved combustion chamber and port designs. Just trust me, they are really good.
How to identify a small block Chevy cylinder head?
Chevy cylinder head Identification – Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Find cast numbers Cylinder Head ID Use these casting numbers to identify the heads you have. Small Block Casting numbers Casting Number CID Years Valves Comments 10065202 350 82-86 1.94/1.50 76cc 10065203 350 82-86
What’s the casting number on a Chevy Vortec?
Casting number 12558062 is a Vortec head that is available from Chevrolet Performance. It is completely assembled with 1.94/1.50-inch valves, and 64 cc combustion chambers. It can be machined for 2.20/1.60-inch valves.
