moding/changing 5.3l ideas help?

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10-27-2012, 02:53 PM
vtrey

moding/changing 5.3l ideas help?

I'm wanting to get a 5.3l complete with computer take stock heads off and change them with a set of 806 heads but if I do that it would lower my compression so I was thinkin maybe run 4.8 pistons and maybe thinner gasket? Good idea?
10-27-2012, 04:48 PM
GraniteBlueNNBS

806 is a 5.3 head. Why change. Newer 5.3 have 243/799 heads with flat top pistons.
10-27-2012, 07:40 PM
kerrige

806 is actually the early LS1 heads. They aren't anything special. However swapping to 243s and 4.8 pistons would be a great option. Add a good 40hp with a good tune.
10-28-2012, 04:50 PM
vtrey

Quote:

Originally Posted by kerrige

806 is actually the early LS1 heads. They aren't anything special. However swapping to 243s and 4.8 pistons would be a great option. Add a good 40hp with a good tune.

Well I have 806 already thats why I asked what about 241 heads?
10-28-2012, 05:00 PM
kerrige

241s are about the same. Again going to lower compression with out any significant gains in flow.
10-29-2012, 09:47 AM
vtrey

Quote:

Originally Posted by kerrige

241s are about the same. Again going to lower compression with out any significant gains in flow.

Ok so ill look for some 243 now a cam? Would a 228r with a 112 Lsa
10-29-2012, 01:07 PM
kerrige

228 is. Big cam for a 5.3 and will require a good sized stall to run efficiently. At least 34-3600. I would say a 220 or 224 would be better. What sized truck and what gear ratio does it have? Any other plans such as spray or boost do you have for the build? More details helps a lot when picking a cam. The more we know the more help we canbe.
10-29-2012, 02:06 PM
vtrey

Quote:

Originally Posted by kerrige

228 is. Big cam for a 5.3 and will require a good sized stall to run efficiently. At least 34-3600. I would say a 220 or 224 would be better. What sized truck and what gear ratio does it have? Any other plans such as spray or boost do you have for the build? More details helps a lot when picking a cam. The more we know the more help we canbe.

Well I'm going to build the motor first and trans I work at a trans shop I want to put it in a 72 nova
With 4.11s maybe idk yet
10-29-2012, 02:11 PM
kerrige

Oh if it's going in a Nova you can go a little bigger on the cam, but matching a good stall is important.
10-29-2012, 05:28 PM
vtrey

Quote:

Originally Posted by kerrige

Oh if it's going in a Nova you can go a little bigger on the cam, but matching a good stall is important.

Yeah so I guess a 3000 to 3500?
10-29-2012, 05:54 PM
kerrige

3400 triple disk would be killer with a 226/230 and some worked 243s milled some and add some 4.8 flattop pistons. Screamer for sure.
10-29-2012, 09:20 PM
vtrey

Quote:

Originally Posted by kerrige

3400 triple disk would be killer with a 226/230 and some worked 243s milled some and add some 4.8 flattop pistons. Screamer for sure.

How much of a screamer? Lol what if I just got a 4.8l and a 5.3 crank?
10-29-2012, 09:54 PM
Duct_tape123

Pick the heads you want to run and take them to the machine shop. Have them worked, flowed, and spec'd. Then you can talk to the machinist to spec you a cam that will complete the package and get your DCR where it needs to be. After that you can pick the rest of the parts.