Are 317 heads Cathedral Port?
LQ4 engines received the Generation III 317 V8 head in 2001. It has cathedral shaped intake ports and D shaped exhaust. Its large combustion chamber results in lower compression ratios….New GM LS 317 Head – 6.0L.
| Weight | 26.0 lbs |
|---|---|
| INTAKE PORT SHAPE | CATHEDRAL |
| VALVE SIZE (Int/Ex) | 2 in/1.55 in |
| MATERIAL | Aluminum |
| COMBUSTION CHAMBER VOLUME | 71cc |
Can you port heads yourself?
The best way to save the most money while reaping the same performance benefits is to invest your own personal time into porting and polishing the cylinder head yourself. The porting and polishing process is broadly the same for all cylinder heads.
What tools are needed to port and polish heads?
There are not a lot of tools needed to do your first porting and polishing job. You will need an electric or air powered high speed die grinder, some abrasive rolls and the mandrels they mount to, all of which are included in the Eastwood Engine Porting Kit with Die Grinder.
What cc are LS 317 heads?
71.5 cc’s
See all 18 photos The big-boy award went to the 317 (6.0L truck) heads, as the chamber volume measured a whopping 71.5 cc’s.
What CC are LS 317 heads?
What are the best heads for a 5.3 LS?
GM’s 706 Vortec heads are the cheapest and most effective heads you can use for your 5.3L, or 4.8L, or even some 6.0L LS engine build.
How much does it cost to port a set of heads?
That could be a $1,000 question, if you go the fully ported route. On the low-end, you’re looking at around $200 for a professional three-angle valve job with the existing 1.94/1.50 valves. Add bowl-porting and a set of big valves and you move up into the $500-$700 range.
Should I port my cylinder heads?
Porting cylinder heads has long been a right of passage for serious hot rodders looking to add power on a modest budget. Armed with the right knowledge, the correct tools, and a couple of nights in the garage, it’s an easy and almost free way to pick up airflow, which results in increased power and decreased e. t.’s at the track.
Can You Port your own heads and manifolds to a professional level?
Fig. 6.1. The ability to port your own heads and manifolds to a professional level puts you in a position of building significantly higher output engines for very little extra cost. A first-time porting student of mine built the almost600-hp 350 shown. Output was increased to nearly 750 hp when the nitrous was activated.
What size gasket do I need for 317 heads?
317 heads are designed for a 4.000″ bore motor. Your LS1 is a 3.900″ bore motor. Therefore, you’ll need a thicker gasket on your heads.
What are Cathedral port cylinder heads?
Cathedral port cylinder heads have been mistakenly dismissed by many in LS-series circles for being “old-tech.” However, their thin cross section allows for a high-velocity and smaller-volume runner design with excellent flow. For a street car, this design means excellent throttle response, torque and average power.