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A forum for all the owners and enthusiasts of General Motors B-Bodies from 1965-1996, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


    250 Straight 6

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    78i6belair
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    250 Straight 6

    Post  78i6belair on Mon Nov 17, 2014 6:20 pm

    For those of you who have never seen a 1977-79 B body with a straight 6, here are some pics! I really wonder what or how many B cars came with this engine??

    " />

    " />

    I know it looks like S*&# but one day I will pull it and make it look much better. I did remove the valve cover and paint it correct GM corporate blue but I dummied out and didn't use primer and you can see how its flaking off Mad
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    solo79
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    Re: 250 Straight 6

    Post  solo79 on Mon Nov 17, 2014 7:21 pm

    That is cool. I've only seen maybe one pic posted by Sweet awhile back. You have the super rare AC Delete box I want!


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    78i6belair
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    Re: 250 Straight 6

    Post  78i6belair on Mon Nov 17, 2014 7:31 pm

    Hey thanks man. Its a cool and unique engine forsure and quite honestly it performs pretty decent. Has some pull off the line but not much else. It gets 22mpg easy.

    I find that kinda neat how you find the no A/C heater box a rare thing or option. I would say 60% or more of the 1977-79 B cars still around where I live were built this way. The heater box you see in that pic is from a 1985 Caprice that I got from the yard.

    I still have my original 1978 no A/C heater box if you would like it or trade? The only thing is tho how do you ship something like this.
    I will take pics and upload for you tonight.
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    Sweet Seventy9
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    Re: 250 Straight 6

    Post  Sweet Seventy9 on Mon Nov 17, 2014 8:06 pm

    78i6belair wrote:<snip>I know it looks like S*&# but one day I will pull it and make it look much better. I did remove the valve cover and paint it correct GM corporate blue but I dummied out and didn't use primer and you can see how its flaking off Mad

    That's called "Patina". LOL, J/K


    solo79 wrote:<snip>You have the super rare AC Delete box I want!

    I spotted that immediately too!


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    solo79
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    Re: 250 Straight 6

    Post  solo79 on Wed Nov 19, 2014 7:25 am

    78i6belair wrote:Hey thanks man. Its a cool and unique engine forsure and quite honestly it performs pretty decent. Has some pull off the line but not much else. It gets 22mpg easy.

    I find that kinda neat how you find the no A/C heater box a rare thing or option. I would say 60% or more of the 1977-79 B cars still around where I live were built this way. The heater box you see in that pic is from a 1985 Caprice that I got from the yard.

    I still have my original 1978 no A/C heater box if you would like it or trade? The only thing is tho how do you ship something like this.
    I will take pics and upload for you tonight.

    Oh yes, please post some pics of that. If it's in good condition, I'd be interested in it for sure!


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    1982 Pontiac Trans Am Black T-Top 327/TH350 -Knight Rider KITT replica
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    Re: 250 Straight 6

    Post  GM B-Body Forum on Wed Nov 19, 2014 9:03 pm

    You got that heater box out of an 85 caprice?? Ive only seen one caprice that didnt have factory air, and its the one my friend just bought.
    Oh but you live in Canada right? That would make sense.


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    Sweet Seventy9
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    Re: 250 Straight 6

    Post  Sweet Seventy9 on Wed Nov 19, 2014 9:21 pm

    Hey!  This would work GREAT for a V8 dual-inlet air cleaner with a Factory look!!!







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    Myloth
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    Re: 250 Straight 6

    Post  Myloth on Thu Nov 20, 2014 3:52 pm

    Nice car I have had few 6s GM or otherwise and they are just as fun to drive as their v8 brethren.
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    78i6belair
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    Re: 250 Straight 6

    Post  78i6belair on Fri Nov 21, 2014 5:57 pm

    GM B-Body Forum wrote:You got that heater box out of an 85 caprice?? Ive only seen one caprice that didnt have factory air, and its the one my friend just bought.
    Oh but you live in Canada right? That would make sense.

    Yepp sure did. I grabbed the heater control panel and this newer style heater box has better features than my old original one.
    Never made sence to me how the original heater blower motor would be on always when the ignition was in run or acc position??

    Like you noted, alot of Canadain B cars had no A/C option. Its funny because our summers in SW Ontario are humid and hot as hell!
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    78i6belair
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    Re: 250 Straight 6

    Post  78i6belair on Fri Nov 21, 2014 6:02 pm

    Myloth wrote:Nice car I have had few 6s GM or otherwise and they are just as fun to drive as their v8 brethren.

    Right on and thanks!

    I was alittle concerned when I was deciding between this Bel Air with the 250 6 and a 79 Impala 2dr with the 305 SBC in that the Bel Air would be a slug and really underpowered, such is not the case! It has great off idle torque.
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    `77Box
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    Re: 250 Straight 6

    Post  `77Box on Fri Nov 21, 2014 6:27 pm

    78i6belair wrote:
    GM B-Body Forum wrote:You got that heater box out of an 85 caprice?? Ive only seen one caprice that didnt have factory air, and its the one my friend just bought.
    Oh but you live in Canada right? That would make sense.

    Yepp sure did. I grabbed the heater control panel and this newer style heater box has better features than my old original one.
    Never made sence to me how the original heater blower motor would be on always when the ignition was in run or acc position??

    You pulled the heater box out of a 85??
    Do you know if that would work for my 77?
    The blower is always on like you stated and doesn't work very well..
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    78i6belair
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    Re: 250 Straight 6

    Post  78i6belair on Sat Nov 22, 2014 12:44 pm

    `77Box wrote:
    78i6belair wrote:
    GM B-Body Forum wrote:You got that heater box out of an 85 caprice?? Ive only seen one caprice that didnt have factory air, and its the one my friend just bought.
    Oh but you live in Canada right? That would make sense.

    Yepp sure did. I grabbed the heater control panel and this newer style heater box has better features than my old original one.
    Never made sence to me how the original heater blower motor would be on always when the ignition was in run or acc position??

    You pulled the heater box out of a 85??
    Do you know if that would work for my 77?
    The blower is always on like you stated and doesn't work very well..[/quote

    Hi there! It was either out of an 84, 85, 86 Caprice and from my understanding, yes a newer year heater box
    assembly will fit your 77. The install is abit tight and requires partial lowering of the right side inner fender to clear. the only real reason I changed mine out is because my heater box to firewall seal was leaking.

    I did read somewhere off some factory information and I recall reading that the coolant temp must be at a certian range before blower motor operation will commence. This kinda makes sence to me because I have two colant temp sensors on my engine, one for the overheat warning light and the other I assume for blower motor operation.

    I do believe my blower motor coolant temp sensor is bad because when I had the original heater box setup the blower motor was always on regarless of how cold the engine was. Sorry if this dosent make any sence lol!
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    Sweet Seventy9
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    Re: 250 Straight 6

    Post  Sweet Seventy9 on Sat Nov 22, 2014 12:49 pm

    `77Box wrote:<snip> The blower is always on like you stated

    Yup, it's called "Astro Ventilation" or something like that. There's vents built into the package tray area to allow the air to flow through the passenger cabin and exit through the trunk.


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    1978 Impala Landau x1, Sedan x2, Station Wagon x1
    1978 Caprice Landau x1, Caprice Coupe x2
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    Re: 250 Straight 6

    Post  `77Box on Sat Nov 22, 2014 5:56 pm

    78i6belair wrote:

    Yepp sure did. I grabbed the heater control panel and this newer style heater box has better features than my old original one.
    Never made sence to me how the original heater blower motor would be on always when the ignition was in run or acc position??

    You pulled the heater box out of a 85??
    Do you know if that would work for my 77?
    The blower is always on like you stated and doesn't work very well..[/quote

    Hi there! It was either out of an 84, 85, 86 Caprice and from my understanding, yes a newer year heater box
    assembly will fit your 77. The install is abit tight and requires partial lowering of the right side inner fender to clear. the only real reason I changed mine out is because my heater box to firewall seal was leaking.

    I did read somewhere off some factory information and I recall reading that the coolant temp must be at a certian range before blower motor operation will commence. This kinda makes sence to me because I have two colant temp sensors on my engine, one for the overheat warning light and the other I assume for blower motor operation.

    I do believe my blower motor coolant temp sensor is bad because when I had the original heater box setup the blower motor was always on regarless of how cold the engine was. Sorry if this dosent make any sence lol![/quote]
    [/quote]

    Awesome ill have too look into it because my heater box doesn't seal very good either.
    Thanks for the info!!
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    Re: 250 Straight 6

    Post  `77Box on Sat Nov 22, 2014 5:57 pm

    Sweet Seventy9 wrote:
    `77Box wrote:<snip> The blower is always on like you stated

    Yup, it's called "Astro Ventilation" or something like that.  There's vents built into the package tray area to allow the air to flow through the passenger cabin and exit through the trunk.  

    I am not a fan lol.
    Ecspecially when it 105 out and my heater is always blowing
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    Sweet Seventy9
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    Re: 250 Straight 6

    Post  Sweet Seventy9 on Sat Nov 22, 2014 8:26 pm

    `77Box wrote:I am not a fan lol.
    Ecspecially when it 105 out and my heater is always blowing

    Yeah, through the years I've had several people ask my why I have the heat on in the summer lol.
    The 71-76s do it too.


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    `77Box
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    Re: 250 Straight 6

    Post  `77Box on Sat Nov 22, 2014 8:48 pm

    Sweet Seventy9 wrote:
    `77Box wrote:I am not a fan lol.
    Ecspecially when it 105 out and my heater is always blowing

    Yeah, through the years I've had several people ask my why I have the heat on in the summer lol.
    The 71-76s do it too.

    Haha im glad im not the only one!!
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    Re: 250 Straight 6

    Post  solo79 on Sun Nov 23, 2014 12:44 pm

    Sweet Seventy9 wrote:
    `77Box wrote:I am not a fan lol.
    Ecspecially when it 105 out and my heater is always blowing

    Yeah, through the years I've had several people ask my why I have the heat on in the summer lol.
    The 71-76s do it too.

    These aren't the only cars that do this. Even my 82 Trans Am does this. Every Cutlass, Regal, Monte Carlo I've ever rode in is the same way. I think all GM cars of the 70s and 80s do this. If you have headers it's so much worse. I remember going to car shows with friends back in the day with my first '79 Caprice and they all would ask me if I had the heater on because their feet were on fire.


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    1997 Chevrolet Silverado Ext. Cab 3rd Door White Vortec 350/4L60E

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