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Old 05-11-2007, 08:08 PM
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lookin for specs on sbc heads

does anyone know where i can look to find specs on sbc heads casting # 3998991 they say gm 71 on them i'm tryin to find out factory specs cc's, valves,springs,rockers, ext.

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Old 05-11-2007, 08:29 PM
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go to mortec.com
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Old 05-11-2007, 10:29 PM
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Here is a little of the info you are looking for. Intake port cc's about 160 with 1.94 intake valve

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Old 05-12-2007, 04:47 PM
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i also have another set of heads but all i canfind only is casting #'s and years but i still can't find a website that shows valves rockers and all the info i need is there one that anyone knows about
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Old 05-12-2007, 05:37 PM
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head specs gm

3998991 307/350 68-79 1.72/1.50 76cc
gm 71 heads
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Old 05-12-2007, 05:46 PM
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i keep comin up with the same thing 305/350 heads i pulled them off a running 400 and they look diffrent then my other heads i pulled off a 305 if i rebuild these heads they'll still work for my 400 rite since i pulled em off a running 400? are they worth porting and rebuilding for a race motor?

Last edited by camaroboy1991; 05-12-2007 at 05:47 PM. Reason: add more to question
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Old 05-12-2007, 08:54 PM
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the casting number for the 305 heads i have is 14093627 i know that they are from a 305 87-95 and the valves are way bigger then the heads i took off my 400 but again i can't find anything about the valves rockers nothin.

what would everybody recomend head wise for me to run on a 400 race motor and i know aluminum heads are out of the questions i can barely afford stock parts but theres gotta be something i can do to these or atleast buy a stock set to port and rebuild atleast i hope
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Old 05-12-2007, 09:06 PM
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sorry i was lookin at the paper with all the block numbers on it the #on the heads is 14101081
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Old 05-12-2007, 09:09 PM
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i'm so confused i have so many numbers wrote down and so many people tellin me diffrent things around here but atleast with you guys i actually get info and everyone seems to basically agree and tell me the same stuff
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Old 05-12-2007, 09:15 PM
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Hi,
This is what I would do instead of fooling around with the 400 heads.
http://www.gregsengine.com/350to400.htm

Good luck,
rich
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Old 05-12-2007, 09:17 PM
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well i guess if the "081" heads are better then the "991" i'll try using them i planed on porting them anyway but meanwhile i'll keep my eyes out for some vortec heads
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Old 05-12-2007, 09:24 PM
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Quote:
Originally Posted by richard stewart 3rd
Hi,
This is what I would do instead of fooling around with the 400 heads.
http://www.gregsengine.com/350to400.htm

Good luck,
rich
the heads i have off a 400 which the casting is for a 305/350 has the holes in it allready but i think i mite try F-BIRD'88's idea rather then tryin to run those heads it sounds like alot more work but it should be fun and hopefully i'll learn alot doin it since thats my whole goal building a race motor not really to go fast but to learn
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Old 05-12-2007, 09:32 PM
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the cars gonna basically just be goin to the track on saterday's to test and tune days but i have speed pro forged pistons http://store.summitracing.com/partde...0&autoview=sku stock size rods and crank (both are forged eagle) holley high rise intake holley 750 double pumper carb wapp 50,000 volt distributor a crane cam grind # ss-350-b i don't kno how to read the spec sheet the machine shop ordered it for me

PART 11X112 ENGINE TYPE: MECHANICAL SPECIAL

GRINDN SS-350-B

ENGINE CHEVY 57-87 V8 262-400 ALSO 87-95 TRUCK

VALVE SETTING: .022 EXHAUST .024 HOT

INTAKE @ CAM
338 @
507 ROCKER ARM

INTAKE @ CAM
362 @
543 1.5 ROCKER ARM

LIFT: EXHAUST @ @

ALL LIFTS ARE BASED ON ZERO LASH AND THEORETICAL ROCKER RATIOS

CAM
OPENS
CLOSES
ADVERTISED

.0113 EXHAUS INTAKE 60 BTDC 110 ABDC 350



TAPPET LIFT EXHAUS
110 BBDC 76 ATDC 366

SPRING
RECOMMENDED RPM

RANGE WITH

TRIPLE DUAL OUTER MATCHING

PART
99893 MINIMUM RPM 4800

LOAD CLOSE
120 LBS 1.875 O 1 7/8 MAXIMUM RPM 7500

OPEN:
304 LBS 1.395 VALVE FLOAT 7500

CAM
OPENS
CLOSES
MAX LIFT
DURATIO

@ .050 INTAKE
22 BTDC 59 ABDC 108.5 ATDC 261

TAPPET LIFT EXHAUS
72 BBDC 21 ATDC 115.5 BTDC 273
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Old 05-12-2007, 09:34 PM
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Hi again,
http://www.edelbrock.com/automotive/...wnumbers2.html
I hope this is what you need.
rich
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Old 05-12-2007, 09:36 PM
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i also have a melling cam thats a 278int./288exh.
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