jonathansjeep

I have a 5.3 that I am currently building and am wanting to get 11:1 to 12:1 compression, naturally aspirated. Is pop up pistons the only way to go? Can I use the crank from a 6.0 to stroke it?

Can my standard aluminum truck heads be ported to flow as good as a Ls6 head?

Thanks for the help

Old SStroker

6.0L has same stroke as 5.3 and 5.7 and 6.2.

You could have 5.3 heads ported and they MIGHT do as well as a stock LS6 head. It depends on who does the work. It's usually less expensive to buy LS6 heads (243 casting), have a good valve job done and call it a day.

Why 12:1 compression? For that matter if you are going to be replacing pistons, etc. why start with a 5.3? Buy a 6.0 from a salvage/recyclling yard. What is the engine going into and what do you want it to do? Is there a budget for this build?


Jon

726.0chevelle

iTrader: (17)

i believe the 4.8l [they are flat tops] truck pistons will work in the 5.3 and they are flat tops the truck heads can flow just as much or more as the stock 243s main thing is the 5.3 heads have smaller intake valves get a set of 2.00" valves cut in and they will be close to 243s

nastychevelle

iTrader: (7)

they make forged pistons for the 5.3 now..... but if its a budget the 4.8 pistons do work and are flat tops ... ported 5.3 heads with a good valve job and 2.02/1.60 valves will flow pretty good but TF 205's are def. worth looking at

https://ls1tech.com/forums/generatio...205-heads.html

Old SStroker

Which casting numbers flow "just as much or more as the stock 243s"?

Installing 2.00 intakes in 5.3 heads will NOT make them "close to 243s".

Where did you get that info?

It's not nice to mislead folks. Besides it makes you look, well...not very bright.


Jon

nastychevelle

iTrader: (7)

you could put a 4" stroke in there i think there is a set of forged pistons for a 5.3 with a 4" stroke somewhere....

here i found this... either way its gonna put some decent numbers down low

LSXDoc

iTrader: (8)

if your not on a budget, bore that block out to LS1 specs, get a 4" crank and some LS1 stoker pistons and make that a 383 stroker!

nastychevelle

iTrader: (7)

or if your not on a budget do something no one has done (or at least very few) and put a 4" crank with forged pistons and rods with a set of TF 205's, a custom cam and a ported fast and lay down ungodly numbers that no one has ever seen out of a 5.3

slt200mph

iTrader: (42)

I have been running a set of cnc ported 5.3 TEA heads that have been milled .... they flow 316 on the intake side at .600 lift and the compression is 11.5 ... it is a heads/cam bolt on daily driver that makes 452 rwhp/ 418 rwtq ... Brian Tooley does great work on the 5.3 heads...

nastychevelle

iTrader: (7)

the heads are on a 5.3?

LSXDoc

iTrader: (8)

putting a 4" crank in a 5.3L with no other modification makes it a 5.9L (5881cc), would be some awesome numbers though

nastychevelle

iTrader: (7)

im thinking a 5.3 bored to 3.800 with a 4" crank (363ci) with a set of TF205 heads along with a fast 90/90 setup and a ms3 cam (237/242 .603/.609 112lsa) would be insane

LSXDoc

iTrader: (8)

yes, yes it would

nastychevelle

iTrader: (7)

i just want to see someone do something different.... everyone builds a ls1 or lq4 not many people build a NA 5.3 especially to over 500hp so if you could do that it would be amazing

full setup right here of what i would do

5.3 block bored to 3.800
4" crank
forged pistons
milled TF 205's (12.5:1) < that has you thinking doesn't it
ms3 or similar cam (custom would be best)
vic jr intake with a 4150 style TB (maybe even a zex perimeter plate under that TB )
and SD tune for e85 (if e85 isnt for you go with 11.5:1 and run 93)

and if your against the vic jr just do a fast 90/90 (although i believe a vic would be cheaper and make more power)

slt200mph

iTrader: (42)

They are on LS1 346 cu. in. ... 26.5 MPG on the highway 19.5 aound town and 188,000+ miles on the clock ... it uses 1/2 quart of oil every 5,000 miles... a mericle of modern engeneering ...

nastychevelle

iTrader: (7)

exactly... his thread is about building a stroker from a 5.3L

nastychevelle

iTrader: (7)

bump... people need to see this

LSXDoc

iTrader: (8)

by the way, my 383 WAS a 5.3L, everything is forged, FAST 90/90, and the only thing left is a better set of heads and a tranny!

hummel25

i also have a 5.3 that i want to stroke. my question is do i have to get the block clearenced if putting in a 6.0 crank

nastychevelle

iTrader: (7)

a 6.0l crank is the same as the 5.3 crank guess you didnt catch this in the 2nd post