Anyone Tried 317 Heads on a 5.3? Need Advice!

Chevrolet Technology and Innovations
1

Looking for Insights on 317 Heads and 5.3 Compatibility

I’m diving into some upgrades on my Chevrolet 5.3-liter engine and have been hearing a lot about the 317 cylinder heads. I want to see if anyone here has experience with this combination and can share some insights.

Performance Boosts and Specs

I’m particularly interested in:

  • Airflow Characteristics: How much of a difference do these heads make compared to stock?
  • Horsepower Gains: Are there any real-world numbers out there? Would love to see dyno sheets if possible!
  • Installation Tips: Any specific challenges to expect when swapping these heads in?

General Compatibility

Are there any specific modifications or parts I should also consider to optimize performance with the 317 heads?

Your Experience

If you’ve installed them on a 5.3, I’d love to hear your thoughts or advice! Any pros and cons? Let’s get a discussion going. Thanks in advance for your help!

Looking forward to hearing from you all!

2

I recently swapped 317 heads onto my 5.3 and saw a noticeable improvement in torque, especially in the midrange. I got about 35 more hp on the dyno! Totally worth it.

3

That’s awesome, youngjo! I heard the 317 heads can help with fuel efficiency too. Did you notice any changes in that department?

5 Likes
4

I’ve been debating whether to go this route. My 5.3 feels a bit sluggish, so I’m curious about the cost versus performance increase. What’s a ballpark figure for the swap?

5

The improvements are impressive! I didn’t have my 5.3 on a dyno, but I feel it in the acceleration after I added the 317 heads. It’s like a whole new engine.

6

The swap costs can vary, but generally expect to spend around $1,200 to $2,000 for decent heads and installation.

7

Glad to hear that! Did you make any other modifications along with the heads, or just a straight swap?

5 Likes
8

You can’t beat the price for the performance you get! I did mine without any fancy upgrades and it still rocked! Well worth it for a daily driver.

4 Likes
9

I’m thinking about this upgrade as well, but what about any downsides? Any issues with overheating or tuning required after the swap?

7 Likes
10

Good question, amy27! I didn’t face overheating issues, but I did have to adjust my ECU for optimal performance after the swap.

11

Some people swear by the 317 heads, but I’ve heard mixed opinions about them being too advanced for some builds. What’s the consensus here?

12

I think it all depends on your specific setup. I had great results, but I can see how it might not be for everyone. The 5.3 is pretty forgiving, though!

2 Likes
13

Exactly! Every setup is different. But hey, if it leads to more horsepower, count me in! Just don’t forget to enjoy the ride! :wink:

14

I installed 317 heads on my 5.3 last summer. The biggest challenge was getting the right intake manifold. Make sure you have the compatible one or you’ll face some serious headaches!

15

That’s so true! I also ran into issues with my exhaust manifolds. Some models just don’t fit well with the 317 heads; a little research is key.

3 Likes
16

Don’t forget to check the valve springs too! The stock springs might not handle the lift appropriately.

17

Exactly! I had to upgrade mine as well, otherwise it could’ve led to some serious engine damage.

3 Likes
18

Installation was surprisingly straightforward once I figured out the torque specs. Having a manual handy is a lifesaver. Good luck!

19

True! I’m wondering about your thoughts on the best manual to use. Any suggestions?

4 Likes
20

A Haynes manual worked well for me. It’s clear and has good diagrams. Also, don’t skimp on the gaskets! A good quality gasket can save you from leaks.