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Discussion Starter · #1 ·
I have a 1977 Chevy c20 454 original Engine
. Been looking online a EGR valve that fits the 7.4L engine but seem to run across the ones that fit the 4 to 5 L engines. Any one know a website that has it . Also my truck is a Cheyenne. My question is how do I know if I have the th350 or the th400 transmission on it ? I apologize about to rookie questions but I just started getting into working on my truck and this is a lot of information that is new to me that I'm trying to put together. Than you for your help .
 

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Discussion Starter · #3 ·
The TH350 will have a square pan with a corner cut. The TH400 has a odd shaped pan that comes to sort of a point at the rear of the pan.

No luck on finding a EGR yet but still looking.
I appreciate that information on the transmission. That EGR for a 7.4L, I have been looking for a whole week and found nothing. I thank you for your help.
 

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I don't think it will pass. Can you see the base of the EGR and see if it has the triangle or the canoe shaped base and order one of the two that you posted above? I'm 99% sure the NAPA EGR above is for the small block.
 
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