67 sm to bb heater core conversion - Team Camaro Tech
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post #1 of 10 (permalink) Old Jan 25th, 12, 04:34 PM Thread Starter
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John
 
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67 sm to bb heater core conversion

I plan to change my heater core from smallblock to large block what is needed and where to drill the holes so the tubes line up and photo would help me out thanks
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post #2 of 10 (permalink) Old Jan 25th, 12, 05:49 PM
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Bobby
 
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Re: 67 sm to bb heater core conversion

You need a big block core, probably have to modify your SB heater core clips (I had no luck with the BB ones). Get a heater box seal kit and a heater tube flange plate. If your firewall pad is shot, it's a good time to replace it as it serves as the gasket between the heater box and firewall. The problem with the firewall pad is that it fits TERRIBLE from the center of the car left. If I had to do it again I would cut it down the center and install just the right side, or maybe try the contoured one from Quiet Ride.


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post #3 of 10 (permalink) Old Jan 25th, 12, 06:33 PM
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Re: 67 sm to bb heater core conversion

While Luwi67 is technically correct, if you want to go cheap you can turn the SBC heater core upside down and punch/drill (I used Greenlee dies) some holes in the box located off of the SBC heater core in that position. Don't forget to use a grommet where the hoses interface with the box.

That's what I did before I got the correct items. It's not correct but it works.

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post #4 of 10 (permalink) Old Jan 25th, 12, 08:40 PM
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Tom
 
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Smile Re: 67 sm to bb heater core conversion






69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #5 of 10 (permalink) Old Jan 26th, 12, 05:28 PM Thread Starter
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Re: 67 sm to bb heater core conversion

thanks
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post #6 of 10 (permalink) Old Jan 27th, 12, 04:59 PM
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Re: 67 sm to bb heater core conversion

That looks real good Tom. What did you use to block off the original SB holes through the firewall? I'll be doing this pretty soon.
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post #7 of 10 (permalink) Old Jan 27th, 12, 05:09 PM
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Bobby
 
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Re: 67 sm to bb heater core conversion

The heater box seal kit will come with a block off piece for the SB holes. Basically it's a piece of 3/8" closed cell foam that you can glue in place with 3M super weatherstrip adhesive, just make sure you don't get the adhesive on the foam where the holes are or you'll see it on the engine side looking all sloppy.

67 Camaro 350
M20 4spd console,
8.5, 30 spline Eaton posi 373
Cowl Plenum
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post #8 of 10 (permalink) Old Jan 28th, 12, 05:03 PM
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Re: 67 sm to bb heater core conversion

Thanks! Any of those seals in that kit interior flap seals? Been looking at my box and one door or flap has staples in it but nothing left of a seal if there was one.
And thank you, John for letting me get a few questions in here. I'm right at this stage too. Thinking about trying to disassemble the heater box to get the rust out. Just spot welds, right?
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post #9 of 10 (permalink) Old Jan 28th, 12, 05:52 PM
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Bobby
 
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Re: 67 sm to bb heater core conversion

Yes, there are flap seals too. I glued them in with the 3M super weather strip adhesive. believe it or not I actually got those staples out without disassembling the heater box, it can be done with an insane amount of patience.

Yes, just spotwelds. I just gave mine a POR-15 Metal Ready bath instead of cutting any spot welds. I guess it's like a phosphate bath to dissolve the rust, It works though.

John, how are you making out? I have a tip that I found out while I was doing mine. If you haven't seen your hidden VIN under the blower motor yet, you can see it with the heater box out. Use a small mirror and a flashlight.

67 Camaro 350
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8.5, 30 spline Eaton posi 373
Cowl Plenum
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post #10 of 10 (permalink) Old Jan 29th, 12, 07:56 AM
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Re: 67 sm to bb heater core conversion

If you have the inside and outside heater box out try assembling it on a table. It is easier trying to line up the holes to be cut for the BB heater core.

Mike
69 Camaro Prostreet - purple w/ghost flames , 502 w/ 871 blower


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