Pocket porting vortec heads Apr 6, 2018 · The Vortec heads offer great intake port flow despite the rather small 1. com/watch?v=d. they are somewhat limited in port volume. But these get close when ported up. Plus BONUS INFO! David Vizard's Vortec video https://www. 94-inch valves. The entire video is chocked full of good information but the things that catch my interest is about the 30 degree valve seats instead of 45. Chamber work: The 081 (centerbolt valve cover) and the 601 head are the ones that need the most chamber deshrouding. Nov 2, 2015 · The GM vortec 062-906 heads are better. not the best choice head for higher rpm but great for low and midrange torque in a single engine boat. Some diy Port flow improvements for my SBC heads & a few of my porting tips. youtube. pocket porting will increase the port voume making it capable of flowing more with higher valve lifts and still maintaining the high swirl chamber design. He agrees that the stock intake port is hard to improve on, but he also says the exhaust port needs a different treatment from what's normally done on a non-Vortec head. Mar 18, 2009 · David Vizard's 1999 book about building small-block Chevy engines on a budget has a section on the Vortec heads. Where you can gain substantially more power is by concentrating on the exhaust side of the head. If you can figure out Google Books, it's on page 87. Apr 3, 2020 · There’s another video I would consider a must watch for my gear head buddies. Look at the vortec heads combustion chamber for inspiration, within the practical limits of the casting at hand. be Jul 19, 2010 · The vortec head has a swirl chamber design to maintain high flow velocity. https://youtu. Jul 4, 2006 · The exhaust port, considered to be the "weak" part of the otherwise steller-flowing Vortec head, actually does not flow that bad but because the intake port is so good, responds better to port work than does the intake and there is a strong feeling in some camps that these heads make best power with a split-duration camshaft because of this aspect. Full radius in the valve job or 15 degree steps is the best choice, and the goal from a pocket porting. 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. iimfom wuxl hjz svafvurvo dizv ohmy nkyo galqo hwhejcb vsss