243 heads
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#8
LubeLizard,,, So I guess the the Impala and truck 5.3 engines that come with 243 heads from the factory are having valve shrouding problems also because they have a 3.78 bore with 2.00 intake valves.
I guess the 20 extra horsepower the 5.3 engines picked up going to the 243 heads with 2.00 intake valves is thanks to valve shrouding.
I guess the 20 extra horsepower the 5.3 engines picked up going to the 243 heads with 2.00 intake valves is thanks to valve shrouding.