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Originally Posted by gobrdgo
Hi everybody. Has anyone measured swirl when it comes to porting d ports and at what point is too much swirl? Following Mr Hand’s book doing his combustion chamber mods I’ve picked up 1000 rpm swirl. So we’re at 4000 rpm swirl with a modified 4x chamber. We also flowed a set of 906 vortec sbc heads which I thought were supposed to be big swirl and only saw 2500 rpm. ( we flowed the sbc head to reverse engineer it). So I have a limited understanding of swirl that it’s good and too much can be bad. If anybody can shed more light on it I’d appreciate it. Have a great weekend.
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Pontiac heads were ahead of their time in some ways. Fully machined chambers with all the little cuts in them were all about swirl and working well with low lift cam shafts as they were designed to have "right now" power in heavy cars.