Vortec L31 cylinder head
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==Design limitations and modifications== | ==Design limitations and modifications== | ||
| − | + | ===From Gary Penn, of GMPP:=== | |
| − | + | <blockquote>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. We used up about 10 heads, numerous valves, and about $50,000 worth of labor. The study generated 100+ pages of flow and swirl data, which I have at my desk. | |
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| − | 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. We used up about 10 heads, numerous valves, and about $50,000 worth of labor. The study generated 100+ pages of flow and swirl data, which I have at my desk. | + | |
Here is the short version. Out of the box, .480” valve lift, 350-400 HP dependant on the CR, cam, ring seal, oil control, blah, blah, blah. | Here is the short version. Out of the box, .480” valve lift, 350-400 HP dependant on the CR, cam, ring seal, oil control, blah, blah, blah. | ||
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Unported Vortec’s with the "tricks" can produce 500 HP on well built, high CR, drag race short block. 425-450 HP is more realistic for a killer street engine running on pump gas. | Unported Vortec’s with the "tricks" can produce 500 HP on well built, high CR, drag race short block. 425-450 HP is more realistic for a killer street engine running on pump gas. | ||
| − | + | </blockquote> | |
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==Recommended spark plugs== | ==Recommended spark plugs== | ||
| + | The exact heat range depends on several factors. This is a guide that will get you in the ballpark. Carefully access the heat range before settleing on a plug for your particulat combination, fuel, and how the engine is used. | ||
| − | + | •AC Delco Rapid Fire Spark Plugs R44LTS | |
| − | + | •AC Delco Rapid Fire Spark Plugs MR43LTS | |
| − | + | •AC Delco Rapidfire No 3 Spark Plug | |
| − | + | •ACCEL P526S U-Groove “SHORTY” Double Platinum (approximately 3/16″ shorter than AC R44LTS) | |
| − | + | •ACCEL 516 | |
| − | + | •Autolite 26 | |
| − | + | •Autolite 104 | |
| − | + | •Champion RS12YC | |
| − | + | •Bosch HR10B | |
| − | + | •Bosch HR10BX | |
| − | + | •Bosch HR9DC | |
| − | [[File:Vortec beehive.jpg| | + | [[File:Vortec beehive.jpg|thumb|left|300px|Straight wound spring, Left; Beehive spring, right]] |
| + | <br style="clear:both"/> | ||
==Links== | ==Links== | ||
| − | Nasty Z28.com forum thread, [http://www.nastyz28.com/forum/showthread.php?t=56505 Vortec Cylinder Heads: The Definitive Guide] | + | *Nasty Z28.com forum thread, [http://www.nastyz28.com/forum/showthread.php?t=56505 Vortec Cylinder Heads: The Definitive Guide] |
| − | + | *[http://www.chevyhiperformance.com/howto/97458/index.html Iron Vortec Head All the Details You Need to Know] from the February, 2009 issue of Chevy High Performance. | |
| − | [http://www.chevyhiperformance.com/howto/97458/index.html Iron Vortec Head All the Details You Need to Know] | + | |
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[[Category:Engine]] | [[Category:Engine]] | ||
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