![]() Usually no lubricant is required with iron, but aluminum-head porting applications demand a special lubricant that prevents particles from clogging up the carbides and stones. Different flute angles on the steel burrs are needed for aluminum compared to cast-iron (aluminum requires a wider flute angle). Use the carbide burrs for major material removal the stones and rolls are suitable for final cleanup and polishing. Complete kits with an assortment of carbide burrs and abrasive rolls are available from Mondello Performance or Standard Abrasives. H-O's booklet also contains a bunch of other useful Pontiac info.Īlso required is an assortment of mandrels, carbide-steel grinding burrs, and various abrasive stones and flat grinding discs. Make copies of the templates and use them as gauges, following the porting directions given in the manual. Complete valve job and head-porting instructions, as well as full-scale porting templates, can be found in the Engine Design and Blueprint Assembly Manual, available from H-O Enterprises' (PN TD-02, $12.50). ![]() Naturally you'll have to gasket-match the intakes and extensively port the bowls and short-turn-radius areas on both the intake and exhaust runners to improve flow and match the new, larger valves. The particularly weak exhaust ports require porting throughout the runner length. After installing large 2.11/1.77 valves seated with a good three-angle valve job and full porting, they have the potential to flow right up there with similarly modified factory big-valve, four-barrel, open-chamber, D-exhaust-port heads. Their biggest limiting factor are the small valves-1.96 inches on the intake side, 1.66 on the exhaust. 46 heads specifically, these are high-compression heads used on 400ci two-barrel engines rated at 290 hp.
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