heads and cam choice for 5.3
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Looking at Patriot 5.3 heads to go on my 5.3 in an 02 sierra. Whos got some recommendations. This is an everday driver but, obviously I want the most HP/TQ possible without loosing alot of drivability. I plan on doing heads, cam and pushrods at the sametime, Will I need to change rockers also. This is going to be an NA motor and I dont plan on gasing it.
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Hey, I have an answer for you. GM PN 12565308 cam. This is the same cam that comes with the 02-04 ZO6. Duration is 204/218 I/E is 0.555/0.551 117.5 LSA. Depending on your exhaust and intake set-up with 4 degrees of advance, you would be looking at 352hp/346lb.ft. A nice unit that I would run atleast 91 octane in. My 01 Silverado is getting the same cam in a few weeks from my 03' ZO6. The horsepower and torque numbers are based on a identical engine/cam dyno test in How to Build High Performance LS1/LS6 V-8's by author Will Handzel. Here is a link for the manual that is worth the money. You want to watch your combustion chamber size. You don't want to have to run 100 octane lol. I would stay in the 9.0-10.0 compression range.
http://www.sdpc2000.com/catalog/518/...1_LS6-V-8s.htm
http://www.sdpc2000.com/catalog/518/...1_LS6-V-8s.htm
Last edited by zo6vetteman2003; 01-17-2005 at 10:09 PM.
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o2sierraz71..................you are looking at a hand held tuner to raise your rev. limiter with that cam. Peak hp happens at 6000 rpm. Torque peak is at 4800 rpm, np. ![EEK !!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_eek2.gif)
I believe Patriot sells a head for your truck with a 68cc combustion chamber. If you are looking to supercharge it in the future then you would probably be ok around 10.0:1 compression. I'm not sure about your stock rocker ratio is at 1.7:1 or not. Aftermarket adjustable rockers will add weight to your valvetrain and will not be a good application for high rpm power. You may consider using the stock with longer aftermarket NASCAR quality pushrods.
![EEK !!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_eek2.gif)
I believe Patriot sells a head for your truck with a 68cc combustion chamber. If you are looking to supercharge it in the future then you would probably be ok around 10.0:1 compression. I'm not sure about your stock rocker ratio is at 1.7:1 or not. Aftermarket adjustable rockers will add weight to your valvetrain and will not be a good application for high rpm power. You may consider using the stock with longer aftermarket NASCAR quality pushrods.
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Last edited by zo6vetteman2003; 01-17-2005 at 09:49 PM.
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Originally Posted by 2001CamaroGuy
but that does not give me any more power..... ![Icon Razz](https://ls1tech.com/forums/images/smilies2/icon_razz.gif)
![Icon Razz](https://ls1tech.com/forums/images/smilies2/icon_razz.gif)
Last edited by zo6vetteman2003; 01-17-2005 at 10:11 PM.
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The motor is going to be NA and I dont plan on gasing it. Ive allready got a 3K stall, shift kit exhaust, nelson tune bla bla bla Im ready for the head, cam swap how much can I mill before I have to worry about ignition and race fuel this is an everyday driver but I want the most out of it. Id plan on being around 380 rwhp when done. There are alot of nay sayers but I think it can be done on an everyday.
how do I compute comression ratio?
Ive allready got handzels book it is a good read I just wish they had done up a 5.3
how do I compute comression ratio?
Ive allready got handzels book it is a good read I just wish they had done up a 5.3
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This is an everyday so I want drivability. how much of a cam could I go with. It seems that I should get the cam custom ground to fit the heads. I wonder if anyone sells a package allready together?
My mechanic can do the port and polish job himself, I trust him he's very kowledgable and does good work. I wonder if I should let him do it by hand or get someone to CnC them.
hmmmmmmmmm choices
My mechanic can do the port and polish job himself, I trust him he's very kowledgable and does good work. I wonder if I should let him do it by hand or get someone to CnC them.
hmmmmmmmmm choices