Hi guys,
I am new to the forum and I am wondering the difference in valve sizes between 354 truck and car heads. I know that there are no water crossover openings in the truck heads and that the heat riser is taller. I have heard from some that the truck heads have hardened exhaust valve seats installed from factory and that the valves and ports are the same size as a 392. Any help would be much appreciated and will guide my next hemi purchase. Thanks.
354 TRUCK HEADS...
Moderators: scottm, TrWaters, 392heminut
Re: 354 TRUCK HEADS...
Valves are a bit smaller, the exhaust also uses sodium filled stems and rotators. The heat 'riser' is part of the cooling system.
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www.qualityengineeredcomponents.com
Early Hemi Parts and Pieces,
INVENTORY CLEARANCE IN PROGRESS. See website for details.
Early Hemi Parts and Pieces,
INVENTORY CLEARANCE IN PROGRESS. See website for details.
Re: 354 TRUCK HEADS...
So, when I upgrade to bigger valves, are the 2.0" valves too big for a 354? I know a performance chev 350 usually has 2.02 intake valves and 1.94 exhaust, but hemi's are supposed to breath alot easier. Are 2.0" valves too big? I don't want to give up all of my low range torque as this will be a street engine.
Thanks for the help!
Thanks for the help!
Re: 354 TRUCK HEADS...
Yeah, don't try to compare the Hemi to other lesser engines...lol
The stock 354-392 valves are 2.0 x 1.75 and will do everything you need on a street engine. Keep in mind that the stock sodium filled exhaust are about 7/16" dia so new guides are a given.
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The stock 354-392 valves are 2.0 x 1.75 and will do everything you need on a street engine. Keep in mind that the stock sodium filled exhaust are about 7/16" dia so new guides are a given.
.
www.qualityengineeredcomponents.com
Early Hemi Parts and Pieces,
INVENTORY CLEARANCE IN PROGRESS. See website for details.
Early Hemi Parts and Pieces,
INVENTORY CLEARANCE IN PROGRESS. See website for details.