H/C 5.3 all motor
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H/C 5.3 all motor I'm wanting to build my 5.3 with my tax returns. I'm looking at some 215cc ET performance heads w/a 54cc combustion chamber and want to know what cam I should match them with, or if I could put 1.85 rockers on my current cam(TR224 .563 on 110lsa), and give it .613 lift, and then use the saved money to get a better intake and injectors.
Or if anyone knows of heads that would be better for me let me know.
Any opinions would be appreciated, especially if you have experience with this set-up.
Thanks
-Joshua
Or if anyone knows of heads that would be better for me let me know.
Any opinions would be appreciated, especially if you have experience with this set-up.
Thanks
-Joshua
"Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended." - Thunder Racing.
I'm really interested cuz I am still considering building a 5.3 instead of punching my rusty 5.3 to 5.7. After reading a ton on this site I would think you might want to go with a smaller runner to keep port velocity up, but I am a super newb so what do I know.
I'm really interested cuz I am still considering building a 5.3 instead of punching my rusty 5.3 to 5.7. After reading a ton on this site I would think you might want to go with a smaller runner to keep port velocity up, but I am a super newb so what do I know.
Last edited by j200pruf; Jan 24, 2008 at 08:31 PM.
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okay then what cam?? I
would like to keep a 110 LSA because i love the way it sounds, an the whole truck shakes back and forth. But if there is somethin better I'm open to suggestions.
would like to keep a 110 LSA because i love the way it sounds, an the whole truck shakes back and forth. But if there is somethin better I'm open to suggestions.
Run that cam w/ stock rocker ratio, those ET heads(make sure it is 54cc), and an .040 head gasket. That will be one stout 5.3. I would stay away from a larger cam than what you currently have b/c you will start to lose alot of low end torque. Port velocity should be excellent w/ a 215cc runner.
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From: Douglasville, GA
Thread Starter
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From: Douglasville, GA
Run that cam w/ stock rocker ratio, those ET heads(make sure it is 54cc), and an .040 head gasket. That will be one stout 5.3. I would stay away from a larger cam than what you currently have b/c you will start to lose alot of low end torque. Port velocity should be excellent w/ a 215cc runner.
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I run Cometic gaskets in an 0.040 thickness that can be found on just about any sponsors website. Fel-Pro makes an 0.041 gasket, but I don't personally have any experience with them. I'm not sure what the part numbers are for either manufacturer.
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Verdad Gallardo Hey Jimmy, what size of a cam would you suggest for a 5.3 that is going into a light car with 4.10s where the loss of bottom end really wouldn't be that big of a deal. And when looking for heads for a 5.3 would you want to stick with the stock valves or upgrade to the larger ls1 valves?
Last edited by j200pruf; Jan 25, 2008 at 02:10 PM.
You need to get the compression up a good bit to go with a cam larger than 220 duration, which is difficult with the small displacement of the 5.3. You can only mill the heads so far before running into intake sealing problems and it also reduces PTV clearance. These factors make it somewhat counterproductive to go with a cam larger than 228 duration. As far as valve size 2.02 is ok but will be shrouded by the small bore, so I would stay away from anything larger. The setup above will probably be the most optimal for almost every situation.
Now if you put your hands on one of the newer 5.3's with flat top pistons you can bring the compression up higher with less milling. The main thing is to run a cam that will keep the DCR at an optimal level.
Now if you put your hands on one of the newer 5.3's with flat top pistons you can bring the compression up higher with less milling. The main thing is to run a cam that will keep the DCR at an optimal level.
Cool deal, I was hoping to save some cash by just getting a 5.3 block with good cylinders instead of getting my current one bored and buying 5.7 pistons for it, oh well. Or could I get a set of the flat top pistons and put them in an older 5.3?
You could change to the newer pistons, but it'll most likely cost the same as buying a whole second hand engine. You shouldn't be discouraged from using the one you have. I was trying to guide you to use the right parts, not talk you out of it. A 224 cam in a 5.3 will run strong and sound just as tough. I'd use what you have already and I bet you'll be pleased with the results.
If I were in your shoes, I'd run the cam you have, mill about .040 off the heads, do a mild home P&P on the heads to smooth things but not add any appreciable volume, then have a good valve job done along with a back-cut on the valves. Put it together with a Cometic or similar .040 thick gasket, and an LS6 manifold, and you should have a pretty stout setup.
so 243s milled 57cc flat top 4.8 pistons hmm ok cam suggestion
i got a 01z06 i can either put 1.85 or 1.75 ratio rockers on it
or just spend more money and put the 1.75s on this one??
Duration at 050 inch Lift: 216 int./224 exh.
Lobe Separation (degrees): 115
lift: 561
i got a 01z06 i can either put 1.85 or 1.75 ratio rockers on it
or just spend more money and put the 1.75s on this one??
Duration at 050 inch Lift: 216 int./224 exh.
Lobe Separation (degrees): 115
lift: 561
Last edited by jkwalkercchs; Jan 26, 2008 at 06:14 AM.
That's what I thought too. But researching and asking people I have only found and been told that the pin height is different. I'm gonna put my hands on some and measure myself.
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Run that cam w/ stock rocker ratio, those ET heads(make sure it is 54cc), and an .040 head gasket. That will be one stout 5.3. I would stay away from a larger cam than what you currently have b/c you will start to lose alot of low end torque. Port velocity should be excellent w/ a 215cc runner.