Vortec Head Modifications / Question For The Cylinder Head Experts Nastyz28 Com : For stock cam, heads and cr that's very good.. The real weakness of the vortec head is the exhaust port, a fact that is readily apparent when you get into porting these heads. Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks. Valve spring seat diameter is 1.280. The vortec 350 came in hundreds of thousands of chevrolet and gmc pickups, suvs, and vans from 1996 to about 1998, so they are easy to find and relatively inexpensive to build. Comp cams recommends that its pn.
By changing the springs, the distance between the retainers and the valve seals hasn't changed. Featuring the comp cams xm270h ca. The real weakness of the vortec head is the exhaust port, a fact that is readily apparent when you get into porting these heads. Vortec heads require a dedicated intake as they only use 4 bolts per side, and the bolt angles are quite a bit different. Modifying the heads to accept early intake manifolds is not recommended.
Undercover Porting Brzezinski Racing Products from www.castheads.com I ported mine and fully worked the exhaust port (bowl work and contouring the runner). Two years ago we undertook an exhaustive (no pun intended) study of the vortec head in numerous modified states with different valve sizes, throat cuts, valve jobs, port mods, guide mods, etc. Gm also sells vortec pattern intakes for tbi and 4bbl's. The l76 is a gen. We used up about 10 heads, numerous valves, and about $50,000 worth of labor. Vortec heads require a dedicated intake as they only use 4 bolts per side, and the bolt angles are quite a bit different. The worst piece on the whole tpi system is the cold start injector or referred to as the 9th injector. The stock valve job can be improved on vortec heads.
Vortec head modifications hi everyone, im looking to modify a set of vortec heads for oval track racing application.
I will need to cut (reduce the height) of the valve guide boss.this is the curse (or part of the curse) of the vortec heads. If you want the motor to live a long life plan on adding a forged crank and rods, and i'd. I am not going to install lash caps. These heads are good for a minimum 50hp gain. Valve spring seat diameter is 1.280. Vortec head modification for.480 lift. Tony, just remember that total lift is the cam lobe lift and the rocker arm ratio for total lift. By changing the springs, the distance between the retainers and the valve seals hasn't changed. Discussion starter · #1 · sep 24. This is the speed secrets episode for you! These are iron vortec style heads with heavier casting thicknesses and 2.02 and 1.55 inch valves, they accept higher lifts without modification and feature a 180 cc intake for the 421 and 206 cc intake for the 431. Tbi to vortec head conversion gmc truck forum / vortec heads also use a different intake bolt angle than traditional sbc heads and, as mentioned previously, camshaft lift needs to be kept on the low side, unless other modifications are made. Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene.
For stock cam, heads and cr that's very good. These heads are good for a minimum 50hp gain. Vortec head modification for.480 lift. As illustrated in the pics in post #60; Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene.
Vortec Porting Work Third Generation F Body Message Boards from www.thirdgen.org These are iron vortec style heads with heavier casting thicknesses and 2.02 and 1.55 inch valves, they accept higher lifts without modification and feature a 180 cc intake for the 421 and 206 cc intake for the 431. Even with the valves removed, it resembles a stock head. Two years ago we undertook an exhaustive (no pun intended) study of the vortec head in numerous modified states with different valve sizes, throat cuts, valve jobs, port mods, guide mods, etc. They also feature gm logo cast into bottom of intake ports. Are you looking to get almost 100 more horsepower from your gm 350 crate engine? So the best bang for the buck is gm vortec head but does require a special intake and lots of egr work if you need egr to remain emission legal. Featuring the comp cams xm270h ca. The cam is based on the maximum lift for stock vortec heads and is a single pattern 215d/470l on a 112 center.
Even with the valves removed, it resembles a stock head.
If you want the motor to live a long life plan on adding a forged crank and rods, and i'd. Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene. I will need to cut (reduce the height) of the valve guide boss.this is the curse (or part of the curse) of the vortec heads. Camshafts with more than 0.475 lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance. I am not going to install lash caps. Featuring the comp cams xm270h ca. The stock valve job can be improved on vortec heads. The cam is based on the maximum lift for stock vortec heads and is a single pattern 215d/470l on a 112 center. This upgrade guide is for the 6.0l l76 vortec max truck engine, specifically. So the best bang for the buck is gm vortec head but does require a special intake and lots of egr work if you need egr to remain emission legal. This is the speed secrets episode for you! My cams gross lift is.559. Valve spring seat diameter is 1.280.
Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks. Vortec heads require a dedicated intake as they only use 4 bolts per side, and the bolt angles are quite a bit different. If you want the motor to live a long life plan on adding a forged crank and rods, and i'd. By changing the springs, the distance between the retainers and the valve seals hasn't changed. The end result is a head that will produce a measurable improvement and.
Fed 5 3 L83 Lt Stage 1 Cylinder Heads Set Porting Service Complete Assembled Frankenstein Engine Dynamics from frankensteined.net I ported mine and fully worked the exhaust port (bowl work and contouring the runner). Gm also sells vortec pattern intakes for tbi and 4bbl's. The cam is based on the maximum lift for stock vortec heads and is a single pattern 215d/470l on a 112 center. I recommend you get a block off kit off ebay and remove the thing and tell me when you order a chip so that i can program the chip to run with the other 8 injectors. They also feature gm logo cast into bottom of intake ports. My vortec heads are good to.500 in/.530 ex (with 'forgiveness' in mind) with common components used and absolutely no machining done to the heads valve guides/spring pockets. The stock valve job can be improved on vortec heads. These heads are good for a minimum 50hp gain.
Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks.
I recommend you get a block off kit off ebay and remove the thing and tell me when you order a chip so that i can program the chip to run with the other 8 injectors. The vortec 350 came in hundreds of thousands of chevrolet and gmc pickups, suvs, and vans from 1996 to about 1998, so they are easy to find and relatively inexpensive to build. They also feature gm logo cast into bottom of intake ports. For stock cam, heads and cr that's very good. 1 of 2 go to page. Camshafts with more than 0.475 lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance. These are complete ready to run heads, they are also available under a different p/n as machined but bare. 290 hp (216 kw) at 4000 rpm and 410 lbâ·ft (556 nâ·m) at 3200 rpm. + up to.550 lift on vortec heads w/ no mods! My vortec heads are good to.500 in/.530 ex (with 'forgiveness' in mind) with common components used and absolutely no machining done to the heads valve guides/spring pockets. My cams gross lift is.559. Comp cams recommends that its pn. Discussion starter · #1 · sep 24.
