1/6/2024 0 Comments Ihra 1970 nova stock![]() ![]() Modern pro stock engines generally produce around 2.5 hp/in 3 (114 kW/L), and make upwards of 1,500 hp while being naturally aspirated. The rules that exclude forced induction of any sort, plus allowing head modifications, have resulted in pro stock heads being the most sophisticated in any drag racing category, with valve lifts in the 1 inch region.
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