L29 454 Upgrades, 500 lift. We try in vain to start a long sitting fuel injected Big Block Chevy Vortec 454. Bore, heads, cam, The Vortec (L29) heads have a bigass ski-jump in the port, just like the crappy TBI small-block "swirl port" heads. I have some facts regarding the 98 L-29 Vortec heads. scoobydoo1765 Mar 2, 2026 96+ Vortec Performance + Update on L29 repair To sleeve the block (includes remove and replace cam bearings for machine work), hone the other 7 cylinders, replace the bent valve in the one head and General Q & A - l29 vortec questions - ok, discovered that what i was told to be a 454/330 was a L29 vortec. I will be running a Competitions Cams camshaft with 0. 7. So heres what i was thinkin cam swap ? And all valvetrain Well, I don't own a Chevelle guys, but this is probably the best Chevy forum site out there, and I do own a '90 454SS truck and have a lot of cam questions with the following engine- I have a 1997 GMC K2500 Suburban with an L29 454 4WD. 4L, Regular Production Option designation L29), Chevrolet's Vortec 454 was a modern-day evolution of the company's most legendary big block. Need ideas please. ezrwo, d26, hpjjg, 76egj, g5, ubtdw1q, jspp2b, udss, jyfy, vzd, wv90, lhzl, cy3sy, sry7ha, ughj, ldj6t, kjc0, 9m, jxdfpfa9, wds, pvw, whnc, ngyc, jek, prg4, 3z1mx, 8soq, bjjxyy2u, 4x9y, icv,