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Old 06-28-2019, 08:19 PM   #1
Backpayne
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Join Date: Nov 2015
Location: Seligman, MO
Posts: 493
Question on c20 engine perch in '64

I'm installing a big block olds 455 and have a question about the engine perches.

The c10 perches are a tad too tall, which is expected and I will add a 1/4" spacer, but the frame bolt holes do not line up. Should I just drill new bolt holes in the frame OR should I notch the frame rail a little to get the holes to line up?

Pictures are of my situation.

Thanks!
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Old 06-28-2019, 11:38 PM   #2
Captainfab
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Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
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Re: Question on c20 engine perch in '64

I would just trim the top flange of the frame back a little. You may have to do that anyway for exhaust manifold/header clearance.When big blocks became available in trucks in 1968, the top flange of the frames were narrower from the factory for exhaust manifold clearance.
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Old 06-28-2019, 11:45 PM   #3
Backpayne
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Re: Question on c20 engine perch in '64

Thanks, Captain. I dropped the engine in with the mounts and perches attached. I'm going to add a " spacer and drill new holes. You are definitely right about the headers/exhaust manifolds and trimming the frame; it's an awfully tight fit.
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