Vortec Head Modifications - GM Vortec Intake Manifolds - HPMotors, est. 1977 / Iv engine based off the ls2, which was also produced both as a car engine and a truck engine.. 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. I am not going to install lash caps. The deck surface is.450 and features 65 cc combustion chambers, 175 cc intake and 65 cc exhaust ports. The worst piece on the whole tpi system is the cold start injector or referred to as the 9th injector.
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). Joined jun 15, 2005 · 2 posts. This is the speed secrets episode for you! As illustrated in the pics in post #60;
Tahoe 5.7 Vortec exhaust in a 97 Blazer AWD - S-10 Forum from oldyorkshootists.com The end result is a head that will produce a measurable improvement and. Increased valve lifts require stronger springs. By changing the springs, the distance between the retainers and the valve seals hasn't changed. Are you looking to get almost 100 more horsepower from your gm 350 crate engine? 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. Comp cams recommends that its pn. The stock valve job can be improved on vortec heads. These heads are good for a minimum 50hp gain.
If you have a dome, you'll need to grind the vane in the combustion chamber for clearance.
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. As illustrated in the pics in post #60; I have a set of 1998 5.7 vortec heads # 10239906 and replaced the stock cam with marine cam about.470 lift. Are you looking to get almost 100 more horsepower from your gm 350 crate engine? By changing the springs, the distance between the retainers and the valve seals hasn't changed. Gm also sells vortec pattern intakes for tbi and 4bbl's. 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. This upgrade guide is for the 6.0l l76 vortec max truck engine, specifically. 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 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. Joined jun 15, 2005 · 2 posts. 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.
Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks. Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene. Camshafts with more than 0.475 lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance. Valve spring seat diameter is 1.280. Can be machined for 2.020/1.600 valves.
Swirl port SBC heads from www.crankshaftcoalition.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 modifications hi everyone, im looking to modify a set of vortec heads for oval track racing application. There are other, smaller points that are important to know because they affect cam selection. 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. 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. My cams gross lift is.559. The worst piece on the whole tpi system is the cold start injector or referred to as the 9th injector. Tony, just remember that total lift is the cam lobe lift and the rocker arm ratio for total lift.
Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene.
This is the speed secrets episode for you! 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. Discussion starter · #1 · jun 15, 2005. Rocker arm studs can be pinned or drilled and tapped to 3/8. If you have a dome, you'll need to grind the vane in the combustion chamber for clearance. 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. There are other, smaller points that are important to know because they affect cam selection. We used up about 10 heads, numerous valves, and about $50,000 worth of labor. The real weakness of the vortec head is the exhaust port, a fact that is readily apparent when you get into porting these heads. This upgrade guide is for the 6.0l l76 vortec max truck engine, specifically. Joined sep 19, 2010 · 120 posts. By changing the springs, the distance between the retainers and the valve seals hasn't changed. Increased valve lifts require stronger springs.
Discussion starter · #1 · jun 15, 2005. Joined sep 19, 2010 · 120 posts. + up to.550 lift on vortec heads w/ no mods! 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. Vortec heads require a dedicated intake as they only use 4 bolts per side, and the bolt angles are quite a bit different.
Small-Port Vortec Bowtie Cylinder Head Assembly | Cylinder ... from i.pinimg.com This vortec design special performance cast iron cylinder head features revised intake and exhaust ports and is machined for 2.00 intake valve and 1.55 exhaust valves. These heads are good for a minimum 50hp gain. For stock cam, heads and cr that's very good. This upgrade guide is for the 6.0l l76 vortec max truck engine, specifically. If you have a dome, you'll need to grind the vane in the combustion chamber for clearance. Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene. Featuring the comp cams xm270h ca. Valve spring seat diameter is 1.280.
Discussion starter · #1 · sep 24.
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. 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. 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. Vortec head modifications hi everyone, im looking to modify a set of vortec heads for oval track racing application. The l76 is a gen. This cam would be nice on stock l31 heads due to their lift limitations, if you use the vortec bowtie heads, use a cam with higher lift, or add 1 7:1 rockers on teh lt4 cam for about.506/.510 lift or you can setp up to the zz4 cam with its 208°/221° duration at 0.050 and lift of.474/.510 with 1.5:1 rocker or even better ad some 1.55 or. 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. 1 of 2 go to page. Discussion starter · #1 · jun 15, 2005. By changing the springs, the distance between the retainers and the valve seals hasn't changed. The real weakness of the vortec head is the exhaust port, a fact that is readily apparent when you get into porting these heads.
