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Old 08-11-2017, 02:04 PM   #1
1970ChevC10
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1970 C10 SB 350 to BB 396 Swap

Bought a '67 396 BB for my C10, is it necessary to change my front springs? What other possible hurdles do I face?
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Old 08-11-2017, 02:19 PM   #2
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Re: 1970 C10 SB 350 to BB 396 Swap

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Originally Posted by 1970ChevC10 View Post
Bought a '67 396 BB for my C10, is it necessary to change my front springs?
It will lower it and its up to you if you want to change them.


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Originally Posted by 1970ChevC10 View Post
What other possible hurdles do I face?
Cooling will be the big one.
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Old 08-11-2017, 04:28 PM   #3
1970ChevC10
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Re: 1970 C10 SB 350 to BB 396 Swap

Was also thinking of swapping my TH350 for a Richmond T-10 4 speed. Anybody else try this before? Will that tranny hold up to the 396 that will be installed?
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Old 08-11-2017, 06:00 PM   #4
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Re: 1970 C10 SB 350 to BB 396 Swap

Factory 1/2 ton big blocks came with stock 3/4 ton front springs to carry the extra weight. I used new stock 3/4 springs and cut 1/2 of a coil off to get the height I wanted (along with 2 1/2" drop spindles) and still retain the strength.
You'll also need a 4 row radiator as been mentioned and if you haven't upgraded your front brakes to disk I would do that too. Engine stands are different also.
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Old 08-11-2017, 07:37 PM   #5
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Re: 1970 C10 SB 350 to BB 396 Swap

I imagine you will need all different accessory brackets too. Power steering pump with remote reservoir.
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Old 08-12-2017, 02:08 PM   #6
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Re: 1970 C10 SB 350 to BB 396 Swap

You do not need to replace the front coils. My '70 had a 250 in it and I put in a 402 and did not change the springs. The ride height is the same as before. You will need engine stands as mentioned but the 350 mounts will work and are much less expensive than the big block mounts. I had to move the automatic transmission crossmember back to the rear mounting holes and shorten the driveshaft but you should not need to do that. Also you do not need a 4-core radiator unless you have air or will be towing with it. I have a 3-core and it keeps it plenty cool. The engine is stock with a mild cam and an Edelbrock 750 carb with HEI. You will need a big block fan shroud however.
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