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Old 08-26-2008, 08:52 PM
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400 sbc & heads

hi guys...i have 400 sbc #3951511 and a set of heads #333882...i ran the numbers and came up with 1975-76 and 1970-80 on the block and heads...The heads also had some numbers for the 350...if i remember right 75-76- years were the 4 bolt mains which mine is...the heads i ran on a 350 blower motor in the early 80's...as you probably figured out, i don't know to much about the 400...and please bare with me...i'm 57 years old been a gear head all my life as well as raced rear engine Dragsters in the 80's...my problem is i had 2 strokes a little over a year now and i finally started getting some memory back...i noticed these heads will accept an 7/16 push rod and they have Manley guide plates...i really don't remember them...my wife said they were on the street blower car...their 2.020...looks like no porting work...they also have about 1 inch pipes coming out the front which i think thats how i cooled the heads...back then no inter coolers...i cant remember if i had the block cemented or not...i just got up to speed about the steam holes in the heads and plugging and drilling some holes in the block using a felpro gasket...my question is will theese heads work since they were listed in my book they came stock in 75-76...thanks guys for the time...rock

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Last edited by 67 coupe; 08-26-2008 at 09:02 PM.
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Old 08-26-2008, 09:40 PM
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Quote:
Originally Posted by 67 coupe
hi guys...i have 400 sbc #3951511 and a set of heads #333882...i ran the numbers and came up with 1975-76 and 1970-80 on the block and heads...The heads also had some numbers for the 350...if i remember right 75-76- years were the 4 bolt mains which mine is...the heads i ran on a 350 blower motor in the early 80's...as you probably figured out, i don't know to much about the 400...and please bare with me...i'm 57 years old been a gear head all my life as well as raced rear engine Dragsters in the 80's...my problem is i had 2 strokes a little over a year now and i finally started getting some memory back...i noticed these heads will accept an 7/16 push rod and they have Manley guide plates...i really don't remember them...my wife said they were on the street blower car...their 2.020...looks like no porting work...they also have about 1 inch pipes coming out the front which i think thats how i cooled the heads...back then no inter coolers...i cant remember if i had the block cemented or not...i just got up to speed about the steam holes in the heads and plugging and drilling some holes in the block using a felpro gasket...my question is will theese heads work since they were listed in my book they came stock in 75-76...thanks guys for the time...rock
They should work fine as long as they have the steam holes for street use. They aren't great performance heads but will work.
http://www.gregsengine.com/350to400.htm

http://www.chevytech.com/2c42o2.html

http://www.chevytech.com/2c42o1.html

Cooling Mod you referred to>
http://www.chevytech.com/3c10o20.html
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