243 head label - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**First c10** · 02-17-2015, 12:36 AM

Has anyone seen this before? It was on both heads at the rear. I am not sure what it is? are my heads rebuilt? Or is this factory ?

BR3W CITY · 02-17-2015, 01:45 AM

I don't see an attachment. Anyone else, or is it on my side?

**First c10** · 02-17-2015, 02:16 AM

This is my build thread. There is a picture the last post by me.
http://67-72chevytrucks.com/vboard/s...d.php?t=659275

**truckdude239** · 02-17-2015, 02:30 AM

Its a heat tab it the center is melted volid the WARRANTY means they got head if melted normally put on with new head or when engine was rebulit

**First c10** · 02-17-2015, 02:37 AM

Interesting.
Also It reads "TEAM PRP" do you know what that is?

Wasted Income · 02-17-2015, 11:14 AM

Quote:

Originally Posted by truckdude239

Its a heat tab it the center is melted volid the WARRANTY means they got head if melted normally put on with new head or when engine was rebulit

Quote:

Originally Posted by First c10

Interesting.
Also It reads "TEAM PRP" do you know what that is?

My google-fu was strong today.
http://www.donsauto.com/warranties/gold-coverage-9.html

**First c10** · 02-17-2015, 01:17 PM

Quote:

Originally Posted by Wasted Income

My google-fu was strong today.
http://www.donsauto.com/warranties/gold-coverage-9.html

Thanks Wasted!
I never thought to just google it.

Did GM make 243 heads with different internals, like Springs, Valves etc.

Wasted Income · 02-17-2015, 02:31 PM

Quote:

Originally Posted by First c10

Thanks Wasted!
I never thought to just google it.

Did GM make 243 heads with different internals, like Springs, Valves etc.

Yes.

The 243s that originally came on LS6 engines ONLY (Z06, CTS-V) have the hollow stem intake valves, and sodium filled exhaust valves to allow higher RPM usage. They also have the "yellow" valve springs for use with the LS6 cam.

The 243s that came on 5.3 engines, and LS2 engines have solid stem valves. The 5.3s have "normal" springs, and I believe the LS2s also have the yellow springs....which would make sense, since the cam specs are the same as the LS6 cam.

The castings are the same.

**First c10** · 02-17-2015, 05:41 PM

OK thanks for the info..... so even though they are 243's.... to put a LS6 or LS2 cam in a motor with 243 heads it will need to change the springs? anything else?
My sons truck will have a 4.8 and was thinking about putting a cam in it before I install it, but maybe not as I don't want to create any problems..

Wasted Income · 02-17-2015, 06:35 PM

There's a chance the 243 heads might already have the yellow springs. If not, I'd do them when you swap the cam. They are only like $60 for all of them

Apparently, these are the replacement for the LS6 yellow springs.
https://sdparts.com/details/gm-perfo...parts/12499224

**First c10** · 02-17-2015, 06:48 PM

great thanks for the info!!!

**First c10** · 02-20-2015, 12:52 AM

Do I need to upgrade springs on the 243 heads with an xr259 cam?

BR3W CITY · 02-20-2015, 01:45 AM

I'd really consider replacing the springs ANYTIME you do a cam on a junkyard motor. While you won't need anything like beehive springs or doubles, a good set of springs and hardened pushrods should be done with ANY cam job IMO.

The added seat pressure could always prematurely wear and break an old spring. ALL springs have a lifecycle before they break. Its something I've seen with friends who bought performance-oriented vehicles or engines used.

**First c10** · 02-20-2015, 02:36 AM

The motor has 83k on it that is why I asked. Thanks for the info. I may just change the cam etc just because I have not worked on an ls motor yet. And since it is for a 4x4 a torquey cam would do good for the 4.8 ly2.

Wasted Income · 02-20-2015, 11:11 AM

Quote:

Originally Posted by First c10

Do I need to upgrade springs on the 243 heads with an xr259 cam?

A set of the blue springs i linked to earlier would be perfect for that cam.

**First c10** · 02-20-2015, 01:36 PM

as always thank you guys for the info... any good instructional videos or info on replacing the cam and springs? I know I can just google or youtube but was wondering if you guys had a favorite.

BR3W CITY · 02-20-2015, 03:24 PM

You gotta pick something the Video Channel guy HASN'T done a video on ....thanks...

Seriously tho, I don't like most of the video's on the topic because the instructions in the factory service manual is better. Here is the PDF for ya

http://www.pleasurecraft.com/manuals/L510016.pdf

**First c10** · 02-20-2015, 04:19 PM

Quote:

Originally Posted by BR3W CITY

You gotta pick something the Video Channel guy HASN'T done a video on ....thanks...

Seriously tho, I don't like most of the video's on the topic because the instructions in the factory service manual is better. Here is the PDF for ya

http://www.pleasurecraft.com/manuals/L510016.pdf

Thank you for the link. I agree on the instruction of most videos. Pretty bad! I just what to see someone do it...

Thanks for the help I will try and take pictures as I do it and post to my build thread...

Wasted Income · 02-20-2015, 04:33 PM

If you can fall off of a chair, you can do a cam swap in an LS.

It doesn't get much easier.

BR3W CITY · 02-20-2015, 05:03 PM

Quote:

Originally Posted by Wasted Income

If you can fall off of a chair,

I got a detention in 2nd grade for falling off my chair 13 times in one class day. Needless to say, I'm pretty good with LS engines.

Wasted Income · 02-20-2015, 05:44 PM

That actually explains a lot.

**First c10** · 02-20-2015, 07:09 PM

Quote:

Originally Posted by Wasted Income

If you can fall off of a chair, you can do a cam swap in an LS.

It doesn't get much easier.

Well we will see!!!! I am great at falling off of just about everything!!!

02-17-2015, 12:36 AM	#1
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	243 head label Has anyone seen this before? It was on both heads at the rear. I am not sure what it is? are my heads rebuilt? Or is this factory ? Attached Images __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-17-2015, 01:45 AM	#2
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: 243 head label I don't see an attachment. Anyone else, or is it on my side? __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

02-17-2015, 02:16 AM	#3
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 243 head label This is my build thread. There is a picture the last post by me. http://67-72chevytrucks.com/vboard/s...d.php?t=659275 __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-17-2015, 02:30 AM	#4
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,219	Re: 243 head label Its a heat tab it the center is melted volid the WARRANTY means they got head if melted normally put on with new head or when engine was rebulit __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

02-17-2015, 02:37 AM	#5
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 243 head label Interesting. Also It reads "TEAM PRP" do you know what that is? __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-17-2015, 05:41 PM	#9
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 243 head label OK thanks for the info..... so even though they are 243's.... to put a LS6 or LS2 cam in a motor with 243 heads it will need to change the springs? anything else? My sons truck will have a 4.8 and was thinking about putting a cam in it before I install it, but maybe not as I don't want to create any problems.. __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-17-2015, 06:35 PM	#10
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: 243 head label There's a chance the 243 heads might already have the yellow springs. If not, I'd do them when you swap the cam. They are only like $60 for all of them Apparently, these are the replacement for the LS6 yellow springs. https://sdparts.com/details/gm-perfo...parts/12499224 __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2016 Ford Explorer Sport - Twin Turbskis 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

02-17-2015, 06:48 PM	#11
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 243 head label great thanks for the info!!! __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-20-2015, 12:52 AM	#12
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 243 head label Do I need to upgrade springs on the 243 heads with an xr259 cam? __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-20-2015, 01:45 AM	#13
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: 243 head label I'd really consider replacing the springs ANYTIME you do a cam on a junkyard motor. While you won't need anything like beehive springs or doubles, a good set of springs and hardened pushrods should be done with ANY cam job IMO. The added seat pressure could always prematurely wear and break an old spring. ALL springs have a lifecycle before they break. Its something I've seen with friends who bought performance-oriented vehicles or engines used. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

02-20-2015, 02:36 AM	#14
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 243 head label The motor has 83k on it that is why I asked. Thanks for the info. I may just change the cam etc just because I have not worked on an ls motor yet. And since it is for a 4x4 a torquey cam would do good for the 4.8 ly2. Attached Images __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-20-2015, 01:36 PM	#16
First c10 Registered User Join Date: Dec 2012 Location: Los Banos CA Posts: 2,705	Re: 243 head label as always thank you guys for the info... any good instructional videos or info on replacing the cam and springs? I know I can just google or youtube but was wondering if you guys had a favorite. __________________ 1956 Chevy Bel Air 2 door 1956 Chevy 210 4 Door 1970 K20 LWB project the Hulk build w/Supercharged 4.8L-ly2/4L60E HULK BUILD 1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E 1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR SOLD GO GO!!!

02-20-2015, 03:24 PM	#17
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: 243 head label You gotta pick something the Video Channel guy HASN'T done a video on ....thanks... Seriously tho, I don't like most of the video's on the topic because the instructions in the factory service manual is better. Here is the PDF for ya http://www.pleasurecraft.com/manuals/L510016.pdf __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

02-20-2015, 04:33 PM	#19
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: 243 head label If you can fall off of a chair, you can do a cam swap in an LS. It doesn't get much easier. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2016 Ford Explorer Sport - Twin Turbskis 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

02-20-2015, 05:44 PM	#21
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: 243 head label That actually explains a lot. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2016 Ford Explorer Sport - Twin Turbskis 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*



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