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Hi, I'm new here. I don't have a truck but I am working with a truck engine, and that's why I decided to ask for your elp here.
Anyways, I'm getting ready to work on a 5.3 lm7 to put into my firebird. I plan on running milled 862 heads about .030. I'm thinking about installing 4.8 flat top pistons. To also help bump up compression. Ive herd these pistons will work and I've heard they dont. Do I need to get the 4.8 connecting rods too or can I put them onto my 5.3 rods? Thanks
Yes they will work. Swap pistons and you good. You will want to check for ptv issues.
why not save some time and money and get a flattop 5.3 nnbs engine! but yeah it'll work
I can't decide whether to get a ly5 or l33
Ly5 has got flatops and better heads. Less miles more than likely too and better rods.Quote:
Originally Posted by 99MedBlueBird
Okay guys, what's the difference between all of the genIV 5.3 blocks? (LH6/LY5/LMG/LH8)
The Vortec 4800 LY2 is a Generation IV small block V8 truck engine. Like its LR4 predecessor, it gets its displacement from a 96.01mm bore and 83mm stroke. The smallest member of the Generation IV engine family, it is unique in that it is the only member of that family that use in trucks that does not feature either variable valve timing (until 2010) or Active Fuel Management.
[edit]5.3 L
Vortec 5300
The Generation IV Vortec 5300 engines are truck engines that share all the improvements and refinements found in other Generation IV engines. At present, four versions of the 5300 are in production: two iron block versions (LY5 and LMG) and two aluminum block versions (LH6 and LC9). All versions feature the Active Fuel Management system.
Wikipedia is wonderful :lol:
Ya you sounded like a genius for a second.Quote:
Originally Posted by kerrige
When building my 5.3 I had my 4.8 pistons bored and pressed on 143 LS1 rods, engine runs great in my 81 K5 with stock lapped 862 heads and fbody manifolds. Don't quote me but I believe the L33 flat topped pistons are the same p/n as the 4.8 flat topped pistons. Either way they will work, Good luck with you build.
......meh not the first time :lol:Quote:
Originally Posted by Jess
i don't believe so. the l33 had floating piston pins, where most 4.8's had pressed fit pins.Quote:
Originally Posted by WhiteLS1
Does this mean that there was a difference in the connecting rods? I havent done any of this type of research and im curious.Quote:
Originally Posted by thirdgenbum
I've got a set of floaters in the for sale section.
yes, and i believe all genIV motors got the floating rods/piston combos, and looking at the two side-by-side will show that the genIV rods are quite a bit beefier.Quote:
Originally Posted by cjriojas
awesome. Sounds like a cool build.Quote:
Originally Posted by WhiteLS1
I've got a running high mileage 5.3 that I'm about to drop the bottom end out of to put 4.8 pistons in before I drop it into my C10. My heads are milled .045" and running a 220r cam. I'll be checking PTV for sure. Your .030" mill should be safe, but that all depends on your cam.