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#1
04-05-2007, 06:38 PM
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What are "990" heads???
I have a BB with 990 square port, open chamber heads. I have not pulled the valve cover to get the complete part# but none of my books make reference to any BB heads ending in 990. Are these over the counter replacements and for what applications? I was told my 427 BB had these heads with L88 pistons. Thanks.
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'70 L78 NOVA SS '77 Bronco 
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#2
04-05-2007, 07:14 PM
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Re: What are "990" heads???
Check out "Mortec".
http://www.mortec.com/bbc.htm You've got a pair of open chamber square port over the counter heads. Really nice heads, just not assembly line on anything.
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...................... John Brown This isn't rocket surgery.....
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#3
04-05-2007, 10:05 PM
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Re: What are "990" heads???
mortec.com shows them as 454 service replacement heads, but they have the same chamber as the 074 alum heads.
I have a pair on my car, and they are stamped "L88" on the side.  
__________________
 COPO 9561/9737 M40 X11D80 13.37 @ 105.50 on pump gas,drove it to NATL TRAILS and back [email protected] SCR22
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