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jlk · 07-10-2014, 01:47 AM

Did you mean the K20 had a small block and you're swapping in the big block? Well, the front end will sag because the big block is quite a bit heavier than a small block so you will probably need a pair of add-a-leafs at the least.

Does the big block have headers or manifolds? You may have header clearance issues. You'll probably have to have new head pipes. What year is the C20? Some chevys have the alternator on opposite sides so you'll need an alternator extension wire harness. Your local parts house should have one. The radiator hoses may not align or be different sizes.

That's all I can think of off the top of my head. It's do-able. Good luck!

07-10-2014, 01:47 AM	#5
jlk Registered User Join Date: Sep 2013 Location: Richland, WA Posts: 28	Re: Big Block Conversion Advice? Did you mean the K20 had a small block and you're swapping in the big block? Well, the front end will sag because the big block is quite a bit heavier than a small block so you will probably need a pair of add-a-leafs at the least. Does the big block have headers or manifolds? You may have header clearance issues. You'll probably have to have new head pipes. What year is the C20? Some chevys have the alternator on opposite sides so you'll need an alternator extension wire harness. Your local parts house should have one. The radiator hoses may not align or be different sizes. That's all I can think of off the top of my head. It's do-able. Good luck!