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PRC/TSP has gone through some in house changes lately regarding this issue, and have not had any issues that I am aware of with the LT4 heads. They sell a ton of these heads and there is normally is a 3-4 week waiting period for them after you purchase them.
Black Mast heads are great/tops but they are very pricey.
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2022 Camaro 2SS/ Whipple 3.0 / 2"Headers/ PRC LTX Heads/ Forged Internals/LT4 fueling/ DSX Aux/
DSX Flex Fuel/ Meth Injection/ Katech 112 TB/ RotoFab Big Gulp/ Corsa NPP/ Various exterior mods
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