Vortec Head Modifications - Vortec Cylinder Head Mods Recent Posts : The l76 is a gen.. These heads are good for a minimum 50hp gain. 290 hp (216 kw) at 4000 rpm and 410 lbâ·ft (556 nâ·m) at 3200 rpm. Trucks are the everyday hotrods of the 21 st century. 1 of 2 go to page. Valve spring seat diameter is 1.280.
Iv engine based off the ls2, which was also produced both as a car engine and a truck engine. 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. By changing the springs, the distance between the retainers and the valve seals hasn't changed. + up to.550 lift on vortec heads w/ no mods! I ported mine and fully worked the exhaust port (bowl work and contouring the runner).
Vortec Head Porting Fun 062 Page 2 Hot Rod Forum from www.hotrodders.com Are you looking to get almost 100 more horsepower from your gm 350 crate engine? These are complete ready to run heads, they are also available under a different p/n as machined but bare. We used up about 10 heads, numerous valves, and about $50,000 worth of labor. This quick tech video from comp cams® demonstrates how easy it is to use valve spring seat cutters and valve guide cutters to quickly and easily machine near. My cams gross lift is.559. Im trying to make them suitable for my selected camshaft. Valve spring seat diameter is 1.280. There are other, smaller points that are important to know because they affect cam selection.
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.
Comp cams recommends that its pn. The cam is based on the maximum lift for stock vortec heads and is a single pattern 215d/470l on a 112 center. My cams gross lift is.559. I ported mine and fully worked the exhaust port (bowl work and contouring the runner). Heavier than the aluminum ls1 block. These heads are good for a minimum 50hp gain. 1 of 2 go to page. Valve spring seat diameter is 1.280. 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. Do they have a downside? There are other, smaller points that are important to know because they affect cam selection. Even with the valves removed, it resembles a stock head. Rocker arm studs can be pinned or drilled and tapped to 3/8.
Im trying to make them suitable for my selected camshaft. Rocker arm studs can be pinned or drilled and tapped to 3/8. 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. 1 of 2 go to page. The end result is a head that will produce a measurable improvement and.
Vortec Head Porting Fun 062 Page 2 Hot Rod Forum from www.hotrodders.com 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. Vortec head modification for.480 lift. Valve spring seat diameter is 1.280. I ported mine and fully worked the exhaust port (bowl work and contouring the runner). Even with the valves removed, it resembles a stock head. The study generated 100+ pages of flow and swirl data, which i have at my. 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. So you can see, the oem tune really chokes the potential vs carb.
Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene.
The cam is based on the maximum lift for stock vortec heads and is a single pattern 215d/470l on a 112 center. As illustrated in the pics in post #60; You must use a raised runner design intake mainifold p/n 10051103 (6 bolt mounting), or vortec design 12366573, 12496820, 12496821, 12496822. 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. I ported mine and fully worked the exhaust port (bowl work and contouring the runner). Featuring the comp cams xm270h ca. Discussion starter · #1 · sep 24. Camshafts with more than 0.475 lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance. They also feature gm logo cast into bottom of intake ports. For stock cam, heads and cr that's very good. Trucks are the everyday hotrods of the 21 st century. 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. 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 real weakness of the vortec head is the exhaust port, a fact that is readily apparent when you get into porting these heads. Trucks are the everyday hotrods of the 21 st century. As illustrated in the pics in post #60; 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. Are you looking to get almost 100 more horsepower from your gm 350 crate engine?
Questions About Porting 601 Heads Team Chevelle from www.chevelles.com Valve spring seat diameter is 1.280. 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. 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. The study generated 100+ pages of flow and swirl data, which i have at my. Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene. 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. Vortec head modifications hi everyone, im looking to modify a set of vortec heads for oval track racing application.
The stock valve job can be improved on vortec heads.
Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks. Gm also sells vortec pattern intakes for tbi and 4bbl's. Trucks are the everyday hotrods of the 21 st century. 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. 290 hp (216 kw) at 4000 rpm and 410 lbâ·ft (556 nâ·m) at 3200 rpm. They also feature gm logo cast into bottom of intake ports. 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. So you can see, the oem tune really chokes the potential vs carb. The study generated 100+ pages of flow and swirl data, which i have at my. I am not going to install lash caps. The end result is a head that will produce a measurable improvement and. Vortec heads require a dedicated intake as they only use 4 bolts per side, and the bolt angles are quite a bit different. 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.
