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Warrens69GMC · 07-03-2020, 11:26 PM

Finally bought a 400! I had the option of a 817 fully assembled or a 509 that was torn down. I bought the 509!! Standard bore, told them to keep the crank rods Etc. ...

I plan on a new rotating assembly, 5.7 rods, slight dish and around 9.3 to 9.4 compression. Any suggestions on a camshaft ?

Looking at summit vortec heads or AFR "as cast" 195 aluminum heads. 65cc average CC

1978 C10 - Big10 - Th350/3.08/28.0 tires

Edit - Would you buy a unknown 400 (817-1976) complete as is? asking $250

07-03-2020, 11:26 PM	#134
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,613	Re: 400/406 Builds Finally bought a 400! I had the option of a 817 fully assembled or a 509 that was torn down. I bought the 509!! Standard bore, told them to keep the crank rods Etc. ... I plan on a new rotating assembly, 5.7 rods, slight dish and around 9.3 to 9.4 compression. Any suggestions on a camshaft ? Looking at summit vortec heads or AFR "as cast" 195 aluminum heads. 65cc average CC 1978 C10 - Big10 - Th350/3.08/28.0 tires Edit - Would you buy a unknown 400 (817-1976) complete as is? asking $250 Last edited by Warrens69GMC; 07-03-2020 at 11:39 PM.