Been a while...cracked head interrupted EBL tuning. Those swirl port heads may have done something to create swirl (or maybe not) but they're weak castings. After 2 (!) cracked heads I've replaced them with aftermarket Dart Iron Eagle castings.
331ci Engine specs:
TBI unit (stock 1989 Suburban 2500 4x4)
trans-dapt TBI to 4bbl intake adapter
GM 4bbl intake
Hyd cam (.443I/E lift and 214d dur @.050)
Dart Iron Eagle heads (straight plug, 180cc I, 64cc chambers)
Speed-Pro Hypereutectic pistons (2 valve relief flat top - 327 + .030 over)
Stage II rods from Competition Products
350ci 2 bolt block
327 crank
OEM exhaust manifolds
Gutted cat
Dynoflow 3" turbo muffler
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