Based on information from different cylinder head porters, they feel that you could pick up an easy 20-25 hp by modifying the exhaust side just in the area directly under the exhaust valve seat. ![]() The Vortec heads are much like other stock small-block heads in that the intake port flows fairly well, but higher rpm power is limited by a weak exhaust port. Where you can gain substantially more power is by concentrating on the exhaust side of the head. The Vortec heads offer great intake port flow despite the rather small 1.94-inch valves. Your question relates to porting the Vortec heads to improve the flow, which is a great idea. Our estimate then and now is around 350-375 horsepower. Our original answer combined the Chevrolet Hot cam with a set of these Vortec heads. The details on how to increase the retainer-to-seal clearance can be found in the article and comments here: Stock Vortec heads are limited to 0.425- to maybe 0.450-inch lift. The original answer was related to modifying the heads to accept more valve lift. Jeff Smith: We wrote about Vortec heads in 2016, and that article spawned this question. ![]() This absolutely kills combustion efficiency. Note how the electrode is absolutely buried inside the spark plug mounting threads. This photo shows what happens when a too-short 0.460-inch reach spark plug is used in a Vortec head. Make sure the spark plug is not too short.
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