86 C10 LE9 w/ YDR emissions sticker, need help to ID 2 items

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silverbackreef

Junior Member
Joined
Mar 18, 2023
Posts
14
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Location
FL
First Name
Dude
Truck Year
1986
Truck Model
C10
Engine Size
305
PO has changed a bunch of stuff on my truck and I'm trying to make sure I have my head wrapped around how it was originally. I've found descriptions of everything on this sticker except: the H and J carb ports. Both route to the EGR/PURGE/TCC TVS and I'm unclear what those ports are. My guess is that one is a ported vacuum signal and the other is manifold but I can't be sure.

Oh yeah, I can't inspect the original carb because it's gone. Replaced with an emissions-capable Holley.

Here's my current decode of the carb ports if anyone's looking:

J - ?
H - ?
F - Full manifold, bleed for the EGR valve signal
B - Ported, Spark signal and used for several other systems as well
L - Full manifold, purge for canister and PCV
T - Bowl vent


Many Thanks,
-Mark
 

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