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Old 03-02-2015, 05:58 PM   #1
BigCarl
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Join Date: Sep 2007
Location: Thunder Bay, Ontario
Posts: 170
Tell me about BBC engine towers (perches)

I am planning on putting in a 454 Big Block into my coil suspension C20 this Spring and right now my C20 has a 350 Small Block, which it came with.

67 - 71 had 1 type of perch
72 had a different style of perch
73+ had a different style of perch

Do I need the 72 BBC perches or can I use squarebody perches as well?

Are the SBC and BBC perches and mounts the same for all Squarebody trucks?
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Old 03-02-2015, 09:48 PM   #2
cla511
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Location: Alabama
Posts: 50
Re: Tell me about BBC engine towers (perches)

I used these when I when from a 350 to a 402.

https://www.performanceonline.com/19...-Brackets-V-8/

They worked well on mine. I did have to make a few mods to the fan shroud as we allowed the motor to slide forward instead of sliding the trany back.
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1972 C10 Cheyenne 402/TH350
1985 GMC 1500 Sierra Classic 350/700R
1986 K20 427/NV4500
1986 K20 Sub 406/TH400

"Life's tough.....It's enough tougher if your stupid." John Wayne
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Old 03-02-2015, 09:57 PM   #3
Fitz
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Join Date: Jan 2007
Location: Tucson
Posts: 2,183
Re: Tell me about BBC engine towers (perches)

Quote:
Originally Posted by BigCarl View Post
I am planning on putting in a 454 Big Block into my coil suspension C20 this Spring and right now my C20 has a 350 Small Block, which it came with.

67 - 71 had 1 type of perch
72 had a different style of perch
73+ had a different style of perch

Do I need the 72 BBC perches or can I use squarebody perches as well?

Are the SBC and BBC perches and mounts the same for all Squarebody trucks?
Big block on small block perches...Big block on big block perches. Nuff Said.
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Old 03-02-2015, 10:48 PM   #4
BigCarl
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Join Date: Sep 2007
Location: Thunder Bay, Ontario
Posts: 170
Re: Tell me about BBC engine towers (perches)

Perfect. Thank you very much!
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