Anybody know if someone makes a forged piston to fit a stock 5.3? I don't want to pay for custom pistons or have it bored out and I think good ol' #7 took a crap on me.:argg:
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Anybody know if someone makes a forged piston to fit a stock 5.3? I don't want to pay for custom pistons or have it bored out and I think good ol' #7 took a crap on me.:argg:
I couldnt find one a few years ago. Wished i could have. My #7 smacked the head! Whats up with these # 7s?
Poor fuel distribution I think. What ever it is, it sucks!
You won't have poor fuel distribution in a port-injected engine, similar to what was experienced in the old carburetor days. It is probably related to a cooling issue, which could make #7 more prone to detonation.
I knew it typically ran hotter than the others and just figured it was a fueling issue. :doofus:
Wiseco just came out with some in november. I'm on my way home and when I get there I'll get you a link
Sweet! Thanks!Quote:
Originally Posted by parker
#7 is the leanest because it's the hardest to get fuel to with stock rails.
I knew I heard that somewhere!!Quote:
Originally Posted by GasGuzzler
So if i upgrade rails i will not have that problem? If so what rails do i need to get?Quote:
Originally Posted by GasGuzzler
I got some custom pistons made from Diamond last month, can't remember how much, but they can do a few custom things for you when you order them.
I bet a light hone, new rings and pistons, good to go.
I didn't say A/M rails don't have that problem just that stock ones can.Quote:
Originally Posted by 03chevytruck
Ha--Jay, it is funny how I talked to you about all of this stuff without reading this... :lol:
Yup, do the Wiseco 3.78 pistons (K474XS) and ring set...
+
ARP head bolts
+
ARP rod bolts
+
head gaskets...and you are good. You are prolly looking at dropping a little over $1k in parts. Have fun!
Oh, and some new fuel rails!
Well, found out today that the Wiseco pistons for the 5.3 won't be available for another 2 months!! I looks like I'm going to have to bore it out to a 5.7.
For having to pull the motor completely apart and hone the cylinder
walls, you might as well just go ahead and bore it out for 5.7 pistons.
You gain some cubes, wont cost much more, you know you have good
fresh cylinder walls and parts are readily available.
If you have the money I'd seriously consider upgrading the rods too.
Will make the engine bullet proof.
Yep, that's what's going to happen. I will be getting forged pistons/rods, rings, ARP bolts all the way (heads, rods...), worked 317 heads all balanced. Should be a pretty stout combo when finished. I'm looking to make a little over 300 rwhp, think I'll make it??:spit:Quote:
Originally Posted by r.barn
so will those pistons work with a 4.8 as well?
Nope. That would be like putting 327 pistons in a 350 without changing other stuff...I think.
The pistons that Wiseco has coming out in a couple of months will work on your 4.8. The ones I will be going with are for a 5.7 with a 3.905 bore and will not work with the 4.8. The 4.8 has a 3.779 bore I believe.Quote:
Originally Posted by whitesilvy04
the difference between the 4.8 and 5.3 is in the stoke. the bore is the same. to compression will be differenent with the same pistons, but they should work.Quote:
Originally Posted by GasGuzzler
And I think the 4.8 has flat tops where the 5.3's are dished. Could be wrong on that though.Quote:
Originally Posted by nighthawk
As much I wanna say you are wrong....but you are correct madam.
:duh:Quote:
Originally Posted by txarkitekt
interesting I'm going to have to look into this some more..
the 5.3L HO is the only one that has flat top pistons
sweet setup, should make awesome power.
how come there is poor fuel distribution just to #7 when pressure in liquids is always even throughout the entire volume of the liquid?? (i paid attention that day in class) is the rail getting starved by the time it gets to that last injector, so theres still pressure in there just the amount of fuel is down or something? it just doesnt make sense to me that its a fueling issue... seems more likely that its either getting more air or more heat than the others... or for whatever reason making more power therefore putting more stress on it??? or an oiling issue??
just kinda thinking out loud....
Duh. The difference between a 327 and a 350 is the stroke so the pistons DON'T interchange (without a different length rod). If the stroke changes and the rod does not the pin height must move in the piston hence the 4.8 will never use the same pistons as a 5.3 without changing to custom rods which would mess up other geometry.Quote:
Originally Posted by nighthawk
and isnt a 327 a 5.3 and 350 5.7?
No.
A 327 is 4.00 X 3.25
A 350 is 4.00 X 3.48
A 5.3 is actually like a 325 or something and a 5.7 is a 346 I believe.Quote:
Originally Posted by mitch cobb racing
wait.. I thought the 4.8L shares the same rods as the 5.3L, 5.7L and 6.0L?? The only difference is the crankshaft. The 5.3L, 5.7L and 6.0L have the same type crankshaft.
nope, 4.8 has diff length rods.
Assuming that the pin positions in the pistons are the same, 4.8 would need longer rods. Otherwise, the 4.8 piston would be down in the hole by the difference of the two stroke lengths. Now, if you're running 50 psi boost, that may be a good thing. :burnrubb:Quote:
Originally Posted by whitesilvy04
Dudes....
Really?
They could have the same rods but if the stroke is different the pin has to be in a different place in the piston. If the pin height was the same it would have to have different rods. Why is this so hard?
ok i know this is old thread but i can't let it go. the pistons on the 5.3 and 4.8 are interchangeable. the long ass rods in the 4.8 are what make up the difference. if you put 4.8 pistons in a 5.3 you get a high compression 5.3l like the new model tahoe's and what not have the high compression higher hp 5.3's.
so if a person wanted to yes they could run 5.7 pistons in a 4.8 after it being bored out but you would have to use stock rods. or get some aftermarkets that are same length as 4.8 rods. my buddy is building a high compression 5.3l using stock 4.8 pistons.
if you call the dealer the piston part number from new model 5.3l to the 4.8's they are the same part number.
if you really want to get silly, you could run a 4.8 crank and rods in a 6.0 and have a 327. well its a touch more cubes than that but it really close to the ole 327's. 4" bore and 3.27" stroke is what you would have.
the 4.8 and 5.3 are same everything EXCEPT crank, rods, pistons. the 4.8 and 5.3 pistons have the same pin height and you can use the 4.8 pistons on 5.3 rods and raise your compression alittle more if you have room to clear it for your heads. the 5.3 is actually a 325. the old chevys were the 327.Quote:
Originally Posted by GasGuzzler
Go away. First post digging up a year old thread arguing with a GM tech. Go away.