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Is there any diff b/w 350 and 400 cyl. heads-other than steem holes?

Discussion in 'The Garage' started by COCHEV, Oct 2, 2004.

  1. COCHEV

    COCHEV 1/2 ton status

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    like the title says. i have a 350 that has heads w/ casting #3973493- Mortec says its for a 71-72 sb400 with 76 cc chambers. any difference between those heads and 350 heads other than them being drilled for steem holes? /forums/images/graemlins/dunno.gif also, anyone know any other casting number sites? mortec doesn't list the valve size for these heads and they are still on the block. thanks,

    jason
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    350 heads and 400 heads are the same with the exception of the steam holes. If you have 400 heads and want to install them on a 350 that can be done without doing anything to them, but if you want to install 350 heads on a 400 you need to drill the steam holes first. Also if they are 400 heads they will always have the 1.94" intake valves. /forums/images/graemlins/thumb.gif
     

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