2000 silverado 4.3l Turbo build

[4.8t]

i'm new to this forum. i'm working on a friends 2000 silverado 4.3l with 5spd 2wd. he bought a used sts kit off of a guy. it was a good deal. $900 for everything. we are gonna do a sts mount but it is going to be very close to the y pipe underneath. the turbo is a gt3555* can't rember the last letter. suppose to be good to support 550hp. we are doing a marine intake swap so that he can have upgradeable injectors. i will be useing hptuners to tune the thing. now that have given most the specs on what we are doing. i have some questions. from what i understand you can't use 350 rods because of the crank. so i found some eagle 4.3l rods. but i guess you can use 350 pistons. and the trw's seem to be recommend on here quit abit. so i found some with a part number L2441F-30. how strong are these things? and with stock crank, eagle h-beam rods, and these pistons. about how much boost or hp could this motor hold before the stock crank lets go or the block.


he wants to keep it on the not so costly side. so he don't want to do the 4 bolt main swap and all that stuff. just stock block with a rods and pistons. it has the vortec heads. he is looking at getting a cam. but i can't find any good specs on the heads to know how the flow, so i know what lift of cam to go with. still looking for a for sure cc on the combustion chamber of the heads too.

ok sorry so long but this is my first 4.3l build. and i want to do it best i can for the guy.

thanks,
Mike


here is a pic of the intake.

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

anybody? i'm still searching but its hard to weed through the crap and the good stuff.

 

[WyoSyclone]

Re: 2000 silverado 4.3l Turbo build

Some guys will probably chime in after the long weekend.... has been kind of quiet here on the Holiday

 

[NecroWolf]

Re: 2000 silverado 4.3l Turbo build

the 350 and 4.3 rods are different sizes, 350 pistons are good, as long as you don't detonate you should be fine at 550hp. the marine intake is a good plan. i think the newer vortec heads flow a little better so you might look into those, they'd be a simple bolt on. i don't think you can four bolt the mains on the newer vortec blocks but you can use arp studs. and i'd suggest cometic head gaskets if you can get the block and heads milled right with arp head bolts. as far as a cam erue can suggest a custom one that works.

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

thanks for the replies. been busy myself. when you say newer vortec heads how new? this is a 2000. so the crank and 2 bolt mains should be ok for 500-550? if he can get that with the 4.3 we will go that route if not may do a 5.3l, they are cheap and easy to come by. does the build list look good so far? and what rings should i look for? the pistons don't come with them. we looked for arp main studs/bolts. all we seen were 4 bolt main sets. is there a part number i should search for? does any body know what style injectors are n the marine intake? i know they won't be big enough so i need to replace them. but not sure if they are like the ones in the mustang/camaro/lightning and so on. was thinking seimen deka 60's

ok i looked and did a name search. who is erue and where do i find him/her?

 

[NecroWolf]

Re: 2000 silverado 4.3l Turbo build

i would think syty injectors would work. the newr vortecs are the 01 and up. suppose to be better. i'd suggest the hellfire rings. you can use the arp 4bolt studs, you'll just have extras. you can get the hp but i'd do the v8 for reliability. might do the 6 liter instead of the 5.3. you could get close to 600 n/a with that pretty easily i'd think.

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

what is the flow rate on the stock syty injectors? he is on a tight budget and people sell the lq9's and lq4's for way more than the lm7. either way it will be turbo'd. 5-600 stock with turbo is not too hard for a 5.3l. its done alot at pt.net. only thing is. if we go v8 we have to also get a new clutch. i think the trans will bolt right up but the cluth won't. still need a link to erue.

 

[turbodig]

Re: 2000 silverado 4.3l Turbo build

Stock injectors were 30s. You're not gonna get 500-550 on those.

50# will even be a struggle at that HP level. Motoron 60s are a safe bet.

"budget" and 4.3 turbo conversion are words that normally don't go well together.

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

yeah i figured on the 60's i can get them for about 300-350+shipping. so far he has got some good deals. that intake we found for 199.00. used sts kit 900. ic kit 199.00. wideband 250. so far not too bad. we'll see how it pans out. what turbo's do most the high hp guys use? i see gt35r but what is the full part number? as in what size is the compressor?

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

are these the right pistons? L2441F-30

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

we have decided to go for a mpt-70 for this build. should make great power.

 

[UR50SLO]

Re: 2000 silverado 4.3l Turbo build

I've already done 2 marine intake swaps and helped several others.

It's a nice intake to use other than it's a boat anchor. Ours is a 98 Jimmy with sy/ty exhst.mpflds stock turbo/dp and stock injectors.
I use HPTuners as well.
I could send you a test file or starter file if you need some help.
All the internals sound fine. Wont' need much of a camshaft if any. Stock is just fine.
Your heads are good to go too with a freshen.
Cometic with good block/head prep is perfect.
Just keep outa detonation and tune slow you'll be in for a super ride with long duribility.
12,000mi on our turbo swap on a 150,000mi stock 4.3.
~Scott
UR50SLO@aol.com

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

where can i get a set of the syty manifolds? can't seem to find any.

 

[UR50SLO]

Re: 2000 silverado 4.3l Turbo build

Go to the parts wanted and post a ad in there. WTB Stock Sy/Ty manifolds/crossover/downpipe/turbo.

Someone should be able to get you those quickly.

Good luck,
Scott~

 

[4.8t]

Re: 2000 silverado 4.3l Turbo build

thanks, i posted it up.