Vortec Head Modifications / Cylinder Head Porting Basics For The Home Enthusiast - Camshafts with more than 0.475 lift require machining valve guide bosses and checking valve seal to valve spring retainer clearance.. You also have the option of many aluminum heads. Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks. For stock cam, heads and cr that's very good. Its a 4.3, but the exact same setup as a 5.7. You can run nearly any vortec head intake manifold you want.
Flow numbers can be as high as 325 cfm at.600 lift. Upgrading lm7 cylinder heads the stock heads can be cnc ported for more airflow and milled up to.030 in. Can be machined for 2.020/1.600 valves. The current project here is adapting a set of 1996 vortec heads to the syty. Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene.
Vortec Head Porting Tell Me What U Think Third Generation F Body Message Boards from www.thirdgen.org Discussion starter · #1 · sep 24. + up to.550 lift on vortec heads w/ no mods! What is the most obvious way to set the true vortec apart from the older versions, if you have the heads off, the valve shroud on the older 4.3 is bean shaped. Then, fuel rails and all that. 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. Upgrading lm7 cylinder heads the stock heads can be cnc ported for more airflow and milled up to.030 in. 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.
The true vortec 4.3 came out in the mid to late nineties.
I ported mine and fully worked the exhaust port (bowl work and contouring the runner). 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. 308 ft/lb torque @ 3,900 rpm. These heads are good for a minimum 50hp gain. Increased valve lifts require stronger springs. Upgrading lm7 cylinder heads the stock heads can be cnc ported for more airflow and milled up to.030 in. Valve spring seat diameter is 1.280. 1 of 2 go to page. Vortec head modification for.480 lift. Seach this forum for a ton of info. 298 hp @ 5,500 rpm. Discussion starter · #1 · sep 24. + 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 head modification for.480 lift. Joined sep 19, 2010 · 120 posts. These heads are good for a minimum 50hp gain. My cams gross lift is.559.
Porting Vortec Heads And Then Installing Them On A 327 V8 Tbi In 1 1989 K1500 4x4 Third Generation F Body Message Boards from www.thirdgen.org One way to tell is by the casting numbers on the heads and block, you can google them to find out. A 28 hp increase over the stock heads, and the 305 engine now has close to 300 hp. Upgrading lm7 cylinder heads the stock heads can be cnc ported for more airflow and milled up to.030 in. Comp cams recommends that its pn. 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. The true vortec 4.3 came out in the mid to late nineties. Flow numbers can be as high as 325 cfm at.600 lift. These heads are reputed to flow almost twice the volume as the.
You also have the option of many aluminum heads.
The current project here is adapting a set of 1996 vortec heads to the syty. Upgrading lm7 cylinder heads the stock heads can be cnc ported for more airflow and milled up to.030 in. 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. You also have the option of many aluminum heads. Joined sep 19, 2010 · 120 posts. We used up about 10 heads, numerous valves, and about $50,000 worth of labor. The deck surface is.450 and features 65 cc combustion chambers, 175 cc intake and 65 cc exhaust ports. The cam is based on the maximum lift for stock vortec heads and is a single pattern 215d/470l on a 112 center. 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. Flow numbers can be as high as 325 cfm at.600 lift. An example = look at my photo album. By 4 speed dave » fri jul 17, 2009 10:21 am. 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.
For stock cam, heads and cr that's very good. Vortec head modifications hi everyone, im looking to modify a set of vortec heads for oval track racing application. We used up about 10 heads, numerous valves, and about $50,000 worth of labor. 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 ported mine and fully worked the exhaust port (bowl work and contouring the runner).
Swirl Port Sbc Heads from www.crankshaftcoalition.com You can run nearly any vortec head intake manifold you want. 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. I ported mine and fully worked the exhaust port (bowl work and contouring the runner). If you want the motor to live a long life plan on adding a forged crank and rods, and i'd. The vortec is more heart shaped. Vortec head modifications hi everyone, im looking to modify a set of vortec heads for oval track racing application. So you can see, the oem tune really chokes the potential vs carb. There are other, smaller points that are important to know because they affect cam selection.
Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks.
Flow numbers can be as high as 325 cfm at.600 lift. There are other, smaller points that are important to know because they affect cam selection. Its a 4.3, but the exact same setup as a 5.7. 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. These heads are good for a minimum 50hp gain. So you can see, the oem tune really chokes the potential vs carb. 290 hp (216 kw) at 4000 rpm and 410 lbâ·ft (556 nâ·m) at 3200 rpm. Comp cams recommends that its pn. 1 of 2 go to page. If you want the motor to live a long life plan on adding a forged crank and rods, and i'd. 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. You can run nearly any vortec head intake manifold you want. The deck surface is.450 and features 65 cc combustion chambers, 175 cc intake and 65 cc exhaust ports.
