I just bought some 5.3L aluminum heads that I am going to send away and get worked on. Below is the work I am going to have done on the 5.3L heads.

- Install VHP dual valve springs
- Install 2.00 Intake valves
- Install 1.55 Exhaust valves
- Clean up job
- Smooth out all the ports
- Blend the valve seats into the bowls
- Reshape the valve guides
- Polish the combustion chamber
- Mill .040 to bring compression up about .75
- Valve job

And now for my questions, I am wanting to use a Vinci cam and roller rockers but I do not know which ones to use? Any suggestions? I was thinking about the "047" cam and the 1.8 roller rockers but I am not sure about the piston to valve clearence especially since I am milling the heads? I am going to purchase a Radix next year so I want to make sure that the heads, cam, roller rockers will all work well with the supercharger. Other modifications are below in my signature. Thanks in advance.

 

https://www.performancetrucks.net/fo...ighlight=vinci here's a post i made where vinci did some cam comparing in a 4.8L motor. personally, go with the 062 cam (same as 047 with more lift) and the 1.8 rockers as well. so long as piston to valve clearance is covered. the best thing to do is call vinci and get their opinion.

 

I would unshroud the valves I have the same size in my heads

.04 is gonna raise it more than 3/4 of a point

 

Well, if you're going to go boosted for sure, then you don't want to raise the compression at all. Boost likes lower compression ratios to fight detonation. Also if you mill the heads that much I think that you will run into piston to valve clearance problems with 1.8 ratio rockers, but the only way to be postive would be to mock it up and check it with clay. The 047 cam with 1.8s would give around .563 lift, their other cams with .551 lift become .585 with 1.8s. As for the correct cam with boost, I would call them. Joe and Roger were nothing but helpful with me and all my questions. According to their website though, their "Trucker" cam is good for a superchager. It has more overlap and a wider LSA to bleed off excessive cylinder pressure to help fight detonation.

 

I have contacted Vinci and they sugested the "047" cam with the 1.8 rockers but I forgot to tell him about the future plans of the supercharger. Since I am not milling the heads now I was wondering if the rest of the stuff on my list will work well with the supercharger? Any other suggestions would be great. Thanks

- Install VHP dual valve springs
- Install 2.00 Intake valves
- Install 1.55 Exhaust valves
- Clean up job
- Smooth out all the ports
- Blend the valve seats into the bowls
- Reshape the valve guides
- Polish the combustion chamber
- Valve job

 

If you are definate on going FI, you can open the ports up some more because port velocity is not as much of an issue with boost as it is with NA setups. The larger your port volume, the more air you can cram in there. Since you are having them professionally done, I would mention your supercharger plans to the porter.

 

The rest of the head work will be fine with a Radix.

 

I just want to say Thanks to BigKid & Tdrumm because they have been so much help and have answered every question I have asked them. I now know what I have to do no matter if I go NA or FI, I hope I quit changing my mind every other day and decide what I am going to do.

 

Hate to dig inot your thread but its a good one. How much horse power you think you will gain by the head job. I'm in the process of doing the same and wanted to get a base idea on home many ponies this same set up will give me.

 

I am not real sure what kind of numbers to expect but I hope they are great. I will definetly make a dyno run before I do all of the work and another after all of the work has been completed to find out exactly what I have gained. I am glad that this post is helpful to you, I have been doing alot of research and asking alot of questions in the last few months.