how can i tell which type of heads i have?? 250 inline 6 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

burke117 · 01-24-2008, 02:44 AM

I have heard people talk about integral and non integral heads,but i have no idea which one i have??? It is a 1971 gmc 2wd 1/2 ton swb. It came with a 250 stock but i was told it was rebuilt and i want to customize it but want to order the right parts. Any help would be greatly appreciated.

Bus Ted Knuckle · 01-24-2008, 03:54 AM

Integral heads have the intake and head all cast as one piece. These were the last of the inlines produced by GM...well, until recently that is.

burke117 · 01-24-2008, 08:44 AM

thanks for the info

**special-K** · 01-24-2008, 09:06 AM

It`s just one head,btw.

PanelDeland · 01-24-2008, 11:55 AM

Burke, if the intake and the head are one piece then it is an integral.It is my understanding that any integral head is limited by the intake being a part of the head.In other words you can't upgrade to a multi carb or 4 BBl setup.If you can't get the engine to breathe then it will never perform.
You might want to invest in a "Chevrolet Inline Six-Cylinder power manual" It is written by "Leo Santucci" Runs about $19.95 and the ISBN (Give it to your bookstore or use it at www.motorbooks.com to get a faster lookup) is 1-931128-15-4 It will give you a better idea on getting power from that 6. Anotheer good resource is www.inlinersinternational.com

01-24-2008, 02:44 AM	#1
burke117 Registered User Join Date: Dec 2007 Location: magna, utah Posts: 108	how can i tell which type of heads i have?? 250 inline 6 I have heard people talk about integral and non integral heads,but i have no idea which one i have??? It is a 1971 gmc 2wd 1/2 ton swb. It came with a 250 stock but i was told it was rebuilt and i want to customize it but want to order the right parts. Any help would be greatly appreciated.

01-24-2008, 03:54 AM	#2
Bus Ted Knuckle Son of a gun Join Date: Jan 2007 Location: Hot Springs, Arkansas Posts: 1,636	Re: how can i tell which type of heads i have?? 250 inline 6 Integral heads have the intake and head all cast as one piece. These were the last of the inlines produced by GM...well, until recently that is. __________________ Bill BEATERS ARE NEATER

01-24-2008, 08:44 AM	#3
burke117 Registered User Join Date: Dec 2007 Location: magna, utah Posts: 108	Re: how can i tell which type of heads i have?? 250 inline 6 thanks for the info

01-24-2008, 09:06 AM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: how can i tell which type of heads i have?? 250 inline 6 It`s just one head,btw. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-24-2008, 11:55 AM	#5
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: how can i tell which type of heads i have?? 250 inline 6 Burke, if the intake and the head are one piece then it is an integral.It is my understanding that any integral head is limited by the intake being a part of the head.In other words you can't upgrade to a multi carb or 4 BBl setup.If you can't get the engine to breathe then it will never perform. You might want to invest in a "Chevrolet Inline Six-Cylinder power manual" It is written by "Leo Santucci" Runs about $19.95 and the ISBN (Give it to your bookstore or use it at www.motorbooks.com to get a faster lookup) is 1-931128-15-4 It will give you a better idea on getting power from that 6. Anotheer good resource is www.inlinersinternational.com __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" Last edited by PanelDeland; 01-24-2008 at 11:55 AM.



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