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Old 02-14-2007, 12:55 PM
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400cid heads

Can any one tell me if there is any difference in the heads from a small block 400 GM and a 350 cid GM, I know about the cooling passage, but what about performance? Thanks bob-cat.

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Old 02-14-2007, 01:06 PM
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what is the casting #
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Old 02-14-2007, 01:14 PM
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casting# is 3998991 I dont think they are what I am being told. Thanks
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Old 02-14-2007, 01:41 PM
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All 400 heads have additional cooling holes because the 400 is a siameezed cylinder block. Heads can easily be drilled to fit a 400. Put a 400 gasket on them and drill the missing holes.
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Old 02-14-2007, 01:45 PM
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All the stock, from the factory, 400 Chevy heads I've seen were 76cc. The Chevy 350 could have just about any chamber. The heads are interchangeable, with the exception of the 400 block needing the steam holes. You can use 400 heads on any other SBC because the steam holes become irrelevant.
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Old 02-14-2007, 01:52 PM
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Here's some info. Maybe will help......

http://www.purplesagetradingpost.com...ml#GM%20%20441
http://racingfeed.com/downloads/chevy_flow_data.pdf
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Old 02-14-2007, 02:42 PM
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Quote:
Originally Posted by bob-cat
casting# is 3998991 I dont think they are what I am being told. Thanks



no there not,that number is a 1972-1973 307/350 75cc cumbustion chamber.
www.mortec.com
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Old 02-14-2007, 02:53 PM
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Thanks nitro. Is there any easy way to find out what came on that truck in 1976? Knowing the numbers used on the 400 heads would even help.
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Old 02-14-2007, 03:05 PM
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333882 were 1974-1980
462624 were 1975-1986
468642 were 1976- up
all have 76cc chambers
the 462624 came in different valve sizes 1.72/1.5
1.94/1.5
2.02/1.6
hope this helps
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Old 02-14-2007, 03:20 PM
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what truck in 1976
?

what is the vin code ?

its not hard to find out

i can look it up if i have the engine vin code digit off it

my 77 K-10 pickup is vin code R

LF4 400 175hp 4bbl
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Old 02-14-2007, 03:41 PM
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1976 GMC 2500 vin # TKU2461520517
Thanks a bunch guys your a great help.
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Old 02-15-2007, 01:03 AM
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Did Chevy ever build a hi-power 400 cid v8? Or is it supposed to be a "performance" smog era engine? -Matt
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Old 02-15-2007, 02:40 AM
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Quote:
Originally Posted by ChevelleSS_LS6
Did Chevy ever build a hi-power 400 cid v8? Or is it supposed to be a "performance" smog era engine? -Matt
No, just a torquer in heavy cars/trucks. Most people shunned it through the mid 80s, but now there are much larger small blocks....... the more things change...
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