Chevy 1 ton van Vortec heads, are they as restrictive as the 1 ton pickups?

I was not sure if the van used the same block as the pickup. All I can find about the 350 Vortec heads is that the 1 ton pickups are more restrictive due to the hardened exhaust seat. My question is does the 1 ton van use the same heads?

2 Responses to Chevy 1 ton van Vortec heads, are they as restrictive as the 1 ton pickups?

  1. musiclicker June 4, 2010 at 10:38 am #

    I own a shop, and deal with building race engines a lot. Just because a head is a Vortec head doesn’t mean it is a good head. Some of them were dog heads, and it doesn’t matter what they are in, but what does matter is the casting numbers. If you will go to http://www.chevyhiperformance.com
    and look them up, you will see what they are. They have done test on almost every head on the market, and have posted the results on this website. You may have to dig a while to find this, but it is there. I think you will find it has to do with the years they were manufactured. Some of them don’t flow as good as the stock 1.94/1.50 stock 76cc cast iron heads. This website has the numbers for the heads you want an the ones you don’t want. To answer the question; Yes they are the same heads, and if you will look at the casting numbers, look them up in a book such as the MSA-1 Chevy small block suffix code book, you will find they are the same heads, and the year is what determines the good ones from the bad ones.
    Glad to help out, Good Luck!!!

  2. kirk b June 4, 2010 at 10:38 am #

    usually they are the same motor with different pcm programs at least i am certain with the (r) code motor, eight digit of vin