AAAAAAAHHHHH!!!!! (head casting numbers) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Blue_71 · 07-01-2002, 07:33 PM

i just checked the numbers on my heads while i was adjusting the rockers (much smoother running now) and i checked the head numbers...well heres what mortec has to say about them

3998993....current..350.........Goodwrench crate motors,"Hecho en Mexico",75cc chambers

maybe i should put my extra set on there and do the rings like i need to anyways... heres the info on them

3973487....71-72...350..........used on 71-72 350 LT1, 75cc chamber

same CC chamber but at least its not "hecho en mexico"...ive heard bad things about the mexican motors

**68 Stepside** · 07-01-2002, 09:53 PM

I've heard bad things about mexicans in general.

J/K!!!

bigvinnie · 07-01-2002, 09:56 PM

that was bad...

Alexis · 07-01-2002, 10:46 PM

yeah it still not as bad as Gridley, IL, pooor goats

**68 Stepside** · 07-01-2002, 10:46 PM

I know it was....and I was just kidding....let's see what alexmart says...LOL

**68 Stepside** · 07-01-2002, 10:46 PM

ROFL

Longhorn Man · 07-01-2002, 10:48 PM

Gridley, IL...where men are men...and sheep are scared.

*Randy70C-10* · 07-01-2002, 10:49 PM

Target master engines came from Mexico. Those were some heavy duty engines, don't get rid of those heads!

**MJN** · 07-01-2002, 11:44 PM

Those head numbers in my book refer to these

3998993 = 307 69-73 truck light duty
350 69-74 light duty truck
350 69-74 passenger camaro chevelle nova
307 69-74 camaro chevelle nove
350 '72 corvette 200 hp

The others are
3973487=
350 71 corvette 330, 270 hp
350'71-76 passenger camaro chevelle nova monte carlo
'71-76 truck light duty
'72 corvette 200-255 hp

Blue_71 · 07-02-2002, 12:57 AM

hmmmm... anyway you go about it there not the originals, the block decodes to be a 68 302, 327 or 350

*Randy70C-10* · 07-02-2002, 08:38 AM

Since they're not originals, you may as well get some fuelies and a 6:71 blower.

Blue_71 · 07-02-2002, 07:01 PM

LOL original isnt a big concern with this truck (its in the 4x4)
68 block, newer heads, 69 intake, 76 carb, 70 front clip and doors, 71 cab and frame and axles, 72 gears, 72 bed, unsure seat, 70 dash, unsure tailgate, 78 rear bumper

*Fast68Chevy* · 07-02-2002, 08:20 PM

there is also a date cide between valve springs on the heads just like the casting number is between springs, last digit is the last digit of the year,.

texnician01 · 07-02-2002, 10:11 PM

don't get rid of them cause they are great heads. they are a heavy casting 1.94 intake 1.50 exhaust. they were some of the best heads for the street other than fulies. they were put on all of the Target Master 350 motors and even though built in mexico they were great.

Nathan

Longhorn Man · 07-02-2002, 11:22 PM

Too bad none of the heads mentioned in this thread are worth 1/2 a crap compaired to the Vortec heads.

dmnall · 07-03-2002, 12:51 AM

Since everyone is on the subject of heads!!

Which Heads are better Old Fuelie Heads (not the new heads) or Vortec Heads ???

I have a set of 66 corvette fuelie heads w/ 202 valves (casting 462), I am running these heads but I keep hearing that Fuelie Heads suck and I should just update to Vortec heads (either cast iron, or Aluminum) ? I am going to add OEM Roller Lifter and add a Roller Cam for my Truck (since I am running a 91 350 2bolt) but another question, How much HP can a newer 2 bolt main handle before I have to actually put Splayed Caps on it ??

PrimeredThunder · 07-04-2002, 05:21 AM

So the "Hecho en Mexico" heads are a good head to have? Glad to hear this as I have a set that have been freshly rebuilt and are mounted on my soon to be installed 350! Plus i got them for next to nothing

Kenny

**Tim Christian** · 07-04-2002, 07:51 AM

I would rather have a motor made in Mexico than in China!

07-01-2002, 09:53 PM	#2
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	I've heard bad things about mexicans in general. J/K!!! __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

07-01-2002, 09:56 PM	#3
bigvinnie Registered User Join Date: Aug 2001 Location: escondido, ca 92026 Posts: 1,222	that was bad... __________________ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA 72 Stepside Project

07-01-2002, 10:46 PM	#5
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	I know it was....and I was just kidding....let's see what alexmart says...LOL __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

07-01-2002, 10:46 PM	#6
68 Stepside huh? Join Date: May 2000 Location: Washington, Illinois Posts: 5,692	ROFL __________________ Someday when I'm lonely, Wishing you weren't so far away, Then I will remember Things we said today. RIP El Jay

07-01-2002, 11:44 PM	#9
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 2,974	Those head numbers in my book refer to these 3998993 = 307 69-73 truck light duty 350 69-74 light duty truck 350 69-74 passenger camaro chevelle nova 307 69-74 camaro chevelle nove 350 '72 corvette 200 hp The others are 3973487= 350 71 corvette 330, 270 hp 350'71-76 passenger camaro chevelle nova monte carlo '71-76 truck light duty '72 corvette 200-255 hp __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

07-01-2002, 10:46 PM	#4
Alexis Member since 2000 Join Date: Dec 2000 Location: Mountain View Ca / Mexico Posts: 7,879	yeah it still not as bad as Gridley, IL, pooor goats

07-01-2002, 10:48 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Gridley, IL...where men are men...and sheep are scared.

07-01-2002, 10:49 PM	#8
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Target master engines came from Mexico. Those were some heavy duty engines, don't get rid of those heads!

07-02-2002, 08:38 AM	#11
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	Since they're not originals, you may as well get some fuelies and a 6:71 blower.

07-02-2002, 08:20 PM	#13
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	there is also a date cide between valve springs on the heads just like the casting number is between springs, last digit is the last digit of the year,.

07-02-2002, 10:11 PM	#14
texnician01 Senior Member Join Date: Mar 2002 Location: 12 Miles South of Des Moines, Iowa Posts: 359	don't get rid of them cause they are great heads. they are a heavy casting 1.94 intake 1.50 exhaust. they were some of the best heads for the street other than fulies. they were put on all of the Target Master 350 motors and even though built in mexico they were great. Nathan __________________ 69 C-10, 340HP 327 55 chevy 4 door 150 47 Willys CJ-2A 05 Harley Night Train 06 1200 Sportster (Wife's bike) 70 Honda CL350 OIF2 & OIF7 Veteran Nathan & Tiffany

07-02-2002, 11:22 PM	#15
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Too bad none of the heads mentioned in this thread are worth 1/2 a crap compaired to the Vortec heads.

07-03-2002, 12:51 AM	#16
dmnall Registered User Join Date: Apr 2001 Location: Goleta, CA Posts: 505	Since everyone is on the subject of heads!! Which Heads are better Old Fuelie Heads (not the new heads) or Vortec Heads ??? I have a set of 66 corvette fuelie heads w/ 202 valves (casting 462), I am running these heads but I keep hearing that Fuelie Heads suck and I should just update to Vortec heads (either cast iron, or Aluminum) ? I am going to add OEM Roller Lifter and add a Roller Cam for my Truck (since I am running a 91 350 2bolt) but another question, How much HP can a newer 2 bolt main handle before I have to actually put Splayed Caps on it ?? __________________ 1968 C10 Truck LWB Fleetside 1968 C10 Truck SWB Stepside 1994 K2500 Ext Cab Fleetside 2008 Honda Civic Si lease

07-04-2002, 05:21 AM	#17
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	So the "Hecho en Mexico" heads are a good head to have? Glad to hear this as I have a set that have been freshly rebuilt and are mounted on my soon to be installed 350! Plus i got them for next to nothing Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

07-04-2002, 07:51 AM	#18
Tim Christian Senior Member Join Date: Dec 1999 Location: TN/VA Posts: 6,388	I would rather have a motor made in Mexico than in China!



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