SBC vs. BBC Plug Wires - Team Camaro Tech
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post #1 of 7 (permalink) Old Oct 24th, 14, 06:04 AM Thread Starter
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SBC vs. BBC Plug Wires

What is the difference between plug wires sets for small bock vs. big block? I am looking to change out my fried MSD multi angle wires with 135 boot wires. GM Performance has Packard racing wires with 135 boots they list for abc & HEI. Jegs lists them as universal.

Besides boot angle, what other differences are there. Most companies have two part #'s for SBC vs. BBC. With the same firing order and distributor location, I would assume they would be (other then the stock boot angle) the same. Are the ends on the distributor cap different? Would that matter with upgraded HEI caps?

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post #2 of 7 (permalink) Old Oct 24th, 14, 06:23 AM
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Re: SBC vs. BBC Plug Wires

Quote:
Originally Posted by 68427 View Post
What is the difference between plug wires sets for small bock vs. big block? I am looking to change out my fried MSD multi angle wires with 135 boot wires. GM Performance has Packard racing wires with 135 boots they list for abc & HEI. Jegs lists them as universal.

Besides boot angle, what other differences are there. Most companies have two part #'s for SBC vs. BBC. With the same firing order and distributor location, I would assume they would be (other then the stock boot angle) the same. Are the ends on the distributor cap different? Would that matter with upgraded HEI caps?
BBC wires should be slightly longer since the block is wider and longer.

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post #3 of 7 (permalink) Old Oct 24th, 14, 06:47 AM Thread Starter
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Re: SBC vs. BBC Plug Wires

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Originally Posted by Lawrence454 View Post
BBC wires should be slightly longer since the block is wider and longer.
Makes sense. I wonder if part 24502521 is truly universal as Jegs states, or SBC with shorter wires as GM performance lists. I guess I don't want to be the Guinea pig on $225 wires.

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post #4 of 7 (permalink) Old Oct 24th, 14, 08:21 AM
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Re: SBC vs. BBC Plug Wires

I always buy the universal wires where the sparkplug terminal and boot is already attached (at the angle of your choice) and you have to cut to length and crimp the terminal ends onto the distributor end of each wire.

It's more work but you get a custom fit to the routing of your choice. Always measure twice and cut once.

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post #5 of 7 (permalink) Old Oct 24th, 14, 10:17 AM
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Re: SBC vs. BBC Plug Wires

SBC usually uses a 90 degree bend on the plug boot if it was wired under the exhaust and had a straight plug boot if it was wired above the exhaust. As mentioned the wires are about two inches shorter on a BBC plug set than on a SBC plug set because of the difference in physical size.

All BBC plug sets use the 135 degree plug boot as they are all above the exhaust and have to bend back to avoid the exhaust manifold (which has no double dump to get extra hot in the middle). Still, because of the increased volume of hot gasses, the factory included steel shields on all of the plug boots to protect them from the exhaust manifold. They are held in place by a single bolt in the cast iron exhaust manifold, but can be used with tube headers to offer additional protection from radiant heat.

I also recommend spiral wound metallic core wires over fiberglass impregnated with carbon dust (resistance wires) as the fiberglass breaks down with heat (the reason your glass packs burn out).

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post #6 of 7 (permalink) Old Oct 24th, 14, 10:41 AM
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MSD includes a cutting and crimping tool in their universal sets now. Or at least are supposed to, the set I got only had half of the tool!

Last edited by SnakeEyes; Oct 24th, 14 at 10:42 AM.
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post #7 of 7 (permalink) Old Oct 24th, 14, 12:04 PM
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Re: SBC vs. BBC Plug Wires

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Originally Posted by 68427 View Post
Makes sense. I wonder if part 24502521 is truly universal as Jegs states, or SBC with shorter wires as GM performance lists. I guess I don't want to be the Guinea pig on $225 wires.
How much?!!!!!
A hundred bucks is the most you need to spend.
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