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

[COCHEV]

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

 

[4X4HIGH]

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