5.3L Heads question and answer section
This is a discussion on 5.3L Heads question and answer section within the Internal Engine forums, part of the LSx Technical Help Section category; I keep having questions im finding and getting no answers, I know other people have questions as well or will ...
08-22-2010, 03:01 PM #1
5.3L Heads question and answer section
I keep having questions im finding and getting no answers, I know other people have questions as well or will at some point so i figured making this thread would be a good way to save time and trouble down the road. If not
Next of which being, what size Valves do i need to use in this, ive read bot 2.02/1.57 and 2.00/1.51. Also curious as to which push rods i need to be using. The heads are going to be replacing my current heads on my ls1. Also what lifters i should be looking for would be great as well.
Last edited by 95camaroZNC; 08-22-2010 at 03:44 PM.
08-22-2010, 07:20 PM #2
I installed 2.02" & 1.6" valves in mine using the stock 5.3 head seats. That is the largest you can go with the stock seats I'm told. They can be opened up with the valve grinder for better flow. As far as push rod length, that will be decided after the heads are finished. And depending on how much they are planed or decked.
08-22-2010, 08:08 PM #3
08-23-2010, 03:16 AM #4
I assume you want to use the stock LS1 1.97 valves. That would work, & also with the 1.6 too. You can find them fairly cheap on ebay, for both.
08-23-2010, 10:48 AM #5
I had Bo White port/polish & mill (.018") a set of stock 5.3 heads for me. He also swapped in 2.00 intake valves but we kept the stock exhaust valves. Gunnar@Patriot flowed and assembled them with their double spring kit. The heads outflowed stock LS6 heads & I have been running them for 3yrs/50k miles without a single issue.http://i21.photobucket.com/albums/b2...34244289-L.jpg
99' NBM WS6 6-speed
Mods:Stock bottom end-224/.581 114-TR 7.4's-P/P & milled .018" 5.3's-P/P TB-LS7 lifters-LS7 clutch-LS2 flywheel-MTI lid-Pacesetter LT's-TSP ORY-Hooker Aerochamber
08-23-2010, 02:38 PM #6
I don't mean to jack anyone's thread here, but why 5.3 heads? What's so great about them? Why not LS6 or LS2's?
08-23-2010, 02:41 PM #7
- Join Date
- Oct 2008
- Coral Springs, Fl
Sunset Orange Metalic
- 2001 Camaro SS
08-23-2010, 02:51 PM #8
They take a lot more porting, but it's worth it ! I have +12cc dome pistons, so I'm at 14:1 CR !!!
08-23-2010, 03:11 PM #9
I see. So it's like the equivalent of putting 305 heads on an old 350? An old circle track racer trick to gain more compression.
08-23-2010, 09:09 PM #10
Yep, and spray LOVES compression. Ill keep this thread updated as my build progresses. Ive gotten some really good advice here. Im taking my heads at the start of next week to be milled. Porting kit should show up end of this week and springs next week.
08-24-2010, 03:55 AM #11
I still intend to hit this combo with a 150 dry shot, but at the end of the year I might possibly switch to a new EPS custom grind cam to maximize my combo.
For what its worth, I'm running 89 pump gas (100% gas only) in mine without a tune & it runs just fine & strong. I have a Aeroforce scan gauge set to display knock & the only time I get knock is if I'm at too low of RPM's/too high a gear & step on the gas makin the motor wanna bog for a second. If I'm accelerating thru the gears I get absolutely none & the car pulls hard. I'll run 91 after my tune but 89 hasnt let me down yet or caused any issues.
08-24-2010, 02:34 PM #12
08-24-2010, 02:38 PM #13
Here's a pic of my chambers ready for 2.02 / 1.6 valves...
08-24-2010, 02:41 PM #14
08-24-2010, 03:46 PM #15
08-25-2010, 03:27 AM #16
09-12-2010, 09:29 PM #17
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