numbers on heads - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Boise69 · 01-26-2007, 10:14 PM

Trying to figure out what heads the PO put on my engine, trying to decide if i should go with vortec instead.

heres the numbers on the driver side head:

in front near grill - GM 5

in rear near firewall - 3932441 D 150

can anyone tell me what they are?

tia

larry may · 01-26-2007, 10:21 PM

76cc chambers 350 engine 69-70 this is according to MORTEC. The D 15 0is the date of being cast Looks like April 15th 1970 . Just a SWAG on my part. Larry

Boise69 · 01-26-2007, 10:29 PM

Quote:

Originally Posted by larry may

76cc chambers 350 engine 69-70 this is according to MORTEC. The D 15 0is the date of being cast Looks like April 15th 1970 . Just a SWAG on my part. Larry

ok, so what do i have here? stock GM heads from 1970, with 76cc chambers? what is 76cc telling me? is that any good? can the be better? or just switch to the vortec and move on.? and what does SWAG mean

1BadSS · 01-26-2007, 10:33 PM

441's are a decent performance head when worked right. They were on 275hp police motors aswell.

Boise69 · 01-26-2007, 10:37 PM

how would one 'work them' right? what would i have the machine shop do? i'm not into radical just good performance and i'd like 350 hp.. this is a daily driver and a wanna be tennessee mountain runner.

1BadSS · 01-26-2007, 10:43 PM

Quote:

Originally Posted by Boise69

how would one 'work them' right? what would i have the machine shop do? i'm not into radical just good performance and i'd like 350 hp.. this is a daily driver and a wanna be tennessee mountain runner.

I'd have them ported and polished, 2.02 and 1.60 valves, a small cam, good 4bbl intake, good sized carb (650cfm), will get you 350hp easily.

Everyone rides old iron heads into the ground, but I ran low 10's on a set from the mid 60's.

larry may · 01-26-2007, 11:14 PM

1badss has you covered. A swag is A scientific wildA$$ guess

RACINJASON22 · 01-26-2007, 11:17 PM

Not to dissagree with 1BadSS I use the stock steel heads on a lot of builds myself, But it depends on what the person is after budget and performance taken into account. 441 are the run of the mill truck head. IMO its not cost effective to port polish and install 2.02 1.60 valves in these. Taken into account what can be had for less money and better performance right out of the box. I don't want to step on anyones toes just my .02 good luck with the build

BarryB · 01-26-2007, 11:27 PM

with racingjason, By the time you spend all the money to work them right. You could have bought a new set of performance heads. I know, I have a set of heads I had worked. By the time I had all the machine work done and hours spent porting and polishing my old 041's. I could have had a good set of world product heads.
also like racinjason. I am not trying to step on anybodies toes. just telling you my experience.
If you decide to use Vortec heads, Keep in mind you will also need to get a Vortec intake.
I would weigh my odds.

cooters · 01-26-2007, 11:52 PM

i agree it is to expensive to fix up old heads for the cost of better ones. | have found that light port work to remove casting flash and sharp corners and keeping 194 150 valves is better for low end torque, and is pretty cheap

Boise69 · 01-27-2007, 12:11 AM

Currently It has a EB RPM Air Gap intake. An EB 700cfm carb. energizer Crane Cam and 3 years new. i'd rather not change any of that, my question is, did my PO know what he was doing when he used these heads with the rest of the set up and if so, should i just have the heads 'mildly worked', would this produce 350hp ?

RACINJASON22 · 01-27-2007, 12:18 AM

IMO heads mildly worked and depending soley on the exact cam's specs you should be close to your mark. I think you would have a nice daily driver

01-26-2007, 10:14 PM	#1
Boise69 The Hammer Man Join Date: Oct 2006 Location: Wilmington, NC Posts: 864	numbers on heads Trying to figure out what heads the PO put on my engine, trying to decide if i should go with vortec instead. heres the numbers on the driver side head: in front near grill - GM 5 in rear near firewall - 3932441 D 150 can anyone tell me what they are? tia __________________ Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T

01-26-2007, 10:21 PM	#2
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: numbers on heads 76cc chambers 350 engine 69-70 this is according to MORTEC. The D 15 0is the date of being cast Looks like April 15th 1970 . Just a SWAG on my part. Larry __________________ The biggest problem people have, is other people Thou shalt be cool and not hassle Be a site supporter. The heart of the wise inclines to the right, but the heart of the fool inclines to the left." Ecclesiastes 10:2

01-26-2007, 10:33 PM	#4
1BadSS NOT REALLY BANNED! Join Date: Jul 2004 Location: Shawnee, KS Posts: 1,072	Re: numbers on heads 441's are a decent performance head when worked right. They were on 275hp police motors aswell. __________________ 1987 Mustang Coupe - 2.7 Stroker, 78mm turbo, Stainless header, 3" Exh, FMIC, 160lb/hr Injectors, MS3, twin walbro 255's, 34psi. Eating V8's daily. 04 Pontiac GTO 04 Ford Mustang GT 68 C20 LWB stripper truck 73 K5 Cheyenne 76 C20 Sierra Crew SRW 88 K20 Suburban I'm not hammering on metal just to hammer, i'm creating a piece of art.

01-26-2007, 10:37 PM	#5
Boise69 The Hammer Man Join Date: Oct 2006 Location: Wilmington, NC Posts: 864	Re: numbers on heads how would one 'work them' right? what would i have the machine shop do? i'm not into radical just good performance and i'd like 350 hp.. this is a daily driver and a wanna be tennessee mountain runner. __________________ Boise69. Bought in Boise ID and its a '69 ___________________________________________ 1969 Chevy C-10 SWB 350/400 - drivable project www.americanhammer.com 2013 MBZ Sprinter customized 2005 MBZ Sprinter Van 2004 Land Rover Discovery 2001 Yamaha Road Star 1997 MBZ E420 1989 Ferrari Mondial T

01-26-2007, 11:14 PM	#7
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: numbers on heads 1badss has you covered. A swag is A scientific wildA$$ guess __________________ The biggest problem people have, is other people Thou shalt be cool and not hassle Be a site supporter. The heart of the wise inclines to the right, but the heart of the fool inclines to the left." Ecclesiastes 10:2

01-26-2007, 11:17 PM	#8
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: numbers on heads Not to dissagree with 1BadSS I use the stock steel heads on a lot of builds myself, But it depends on what the person is after budget and performance taken into account. 441 are the run of the mill truck head. IMO its not cost effective to port polish and install 2.02 1.60 valves in these. Taken into account what can be had for less money and better performance right out of the box. I don't want to step on anyones toes just my .02 good luck with the build __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

01-26-2007, 11:27 PM	#9
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: numbers on heads with racingjason, By the time you spend all the money to work them right. You could have bought a new set of performance heads. I know, I have a set of heads I had worked. By the time I had all the machine work done and hours spent porting and polishing my old 041's. I could have had a good set of world product heads. also like racinjason. I am not trying to step on anybodies toes. just telling you my experience. If you decide to use Vortec heads, Keep in mind you will also need to get a Vortec intake. I would weigh my odds.

01-26-2007, 11:52 PM	#10
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: numbers on heads i agree it is to expensive to fix up old heads for the cost of better ones. \| have found that light port work to remove casting flash and sharp corners and keeping 194 150 valves is better for low end torque, and is pretty cheap

01-27-2007, 12:11 AM	#11
Boise69 The Hammer Man Join Date: Oct 2006 Location: Wilmington, NC Posts: 864	Re: numbers on heads Currently It has a EB RPM Air Gap intake. An EB 700cfm carb. energizer Crane Cam and 3 years new. i'd rather not change any of that, my question is, did my PO know what he was doing when he used these heads with the rest of the set up and if so, should i just have the heads 'mildly worked', would this produce 350hp ?

01-27-2007, 12:18 AM	#12
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: numbers on heads IMO heads mildly worked and depending soley on the exact cam's specs you should be close to your mark. I think you would have a nice daily driver __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

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