NassyVette

iTrader: (22)

So I'm getting my stock 98 block honed .005 to bring the final bore size to 3.903 (3.898 + .005). I haven't been able to find answers to the following:

What size pistons do I order to fit this final bore size of 3.903?

What length rods should I be getting if I reuse the stock crank?

What size dish should I get to get my compression to 8.5:1 with a 72cc LQ9 head?

What's the best budget piston for a turbo application? (ie. not lunati)

Best budget connecting rods?

What piston rings should I be going with for FI?

Any other important info that I should know before I start spending cash...lemme know.

Y2K Z28

iTrader: (1)

Probbaly one peice of info is that we have a forced induction forum where you would get better answers to those questions.

NassyVette

iTrader: (22)

Wow....I've been here since 2002 and I'm building a turbo kit but I never discovered the forced induction section!

Last time I checked this was the internal engine forum...right?

Y2K Z28

iTrader: (1)

If you wanna know how to build a turbo engine why not ask the turbo guys? I'm not trying to be an *** but the people in here dont seem to be into trubos and therefore probably arent the best people to ask.

NassyVette

iTrader: (22)

In general turbo's cars are few and far between, but I think this is the right section to be talking about internal engine mods...no matter what the intended application, ie. nitrous, turbo, SC, head cam, stroker etc. If not, the mods can send this over to FI. If I posted this in FI I'd probably have people telling me to post in IE.

Y2K Z28

iTrader: (1)

Probbaly so. I think the forums should be split into n/a nitrous and turbo and not really have an internal engine forum because it seems all anyone talks about in here is cams and heads anyways so just rename it n/a forum and things might get a little more clear.

Mikey 97Z M6

iTrader: (37)

If you're going .005" over, then get 3.903" pistons. I'd suggest checking the block first before ordering pistons though. Depending on mileage, there is a possibility of too much taper in the bore for a .005" hone.

I believe there are forged pistons out there for the stock rod length, but most of the aftermarket pistons will be set up for a 6.125" rod length, so different rods are going to be on your list also. Probably for the best anyway since it's FI.

Best budget stuff is probably going to be Mahle pistons and Eagle H-beam rods for the stock crank. That'll get you a nice stout bottom end that'll handle as much boost as you care to make while still being a street car. If you have other intentions, then be prepared to step up $$ significantly.

Also, some people will tell you that you'll want to be somewhat conservative with a 98' block. The cylinder liners are quite thin after a .005" hone.

Good luck.
Mike

NassyVette

iTrader: (22)

Hey Mikey, thanks for the info. I've heard both sides on the 98 blocks...some say don't worry about the thiner liners others oppose even considering using a 98 block for FI. I think for an extra ~500 bucks I might have to consider a new iron block + stock crank setup.

I'm shooting for ~700rwhp with a TC76 front mount, truck manifolds, forged mahle pistons, eagle rods, stock crank, 12 bolt rear w/ 3.42, tubular K and T56.

Dustin 98TA

Check my sig for my setup, its a 98 block.

Tom@SpeedInc

iTrader: (5)

Were putting an LS1 motor together for a customer to be used with D1SC.

-LS1 block 3.905" bore
-Diamond -2cc pistons ring stack for forced induction
-Hellfire rings
-AFR 3.905 bore 225 heads 72cc- 8019 springs
-Callies compstar 6.125 rods (ARP 2000 hardware)
-cust. asked for Eagle crankshaft 3.622, but could have used stock
-crankshaft machined keyway for use with ATI damper
-fully machined and blue printed rotating assembly, line honed main jornals.
-ARP main studs
-152M main bearings
-7100CH rod bearings

SuperZ

iTrader: (2)

Mines a 98 block 3.905 -16cc mahle pistons with stock 98 head for 8.7 comp.works great

NassyVette

iTrader: (22)

So you honed it .007? I thought the limit for 98's was a .005 hone? Did you build the motor yourself?

Mikey 97Z M6

iTrader: (37)

I'm curious if any of these have been re-sleeved?

Mike

Moparnos (The SLP Guy)

iTrader: (55)

What size pistons do I order to fit this final bore size of 3.903? 3.903

What length rods should I be getting if I reuse the stock crank? 6.125

What size dish should I get to get my compression to 8.5:1 with a 72cc LQ9 head? -16 but why are you going 20psi +

What's the best budget piston for a turbo application? (ie. not lunati)mahle

Best budget connecting rods?go with eagle H

What piston rings should I be going with for FI?hell fire

i don't think you have much options for the 3.903 bore. mahle has a -16 piston 6.125 but in a 3.905 for stock crank. but that .905 bore is no good for the 98 block especially if your going to throw lots of boost on it. so i would say get a diff block, get some 3.905s mahles or diamonds,eagle H beams, if not like i said you dont have many options for the .903 bore for what you want to do. did you finally pick out a cam for this??

NassyVette

iTrader: (22)

Hey Javier, thanks for posting up. I finally got a cam for this build it specs out at 226/226--575/570--115lsa. What do you think?

It's looking more and more like I should just get a new iron block, after paying for all the machining on the stock block I'll have half the price of a new one already invested.

Hows your car coming along? You gotta give me a ride in it when its done

Moparnos (The SLP Guy)

iTrader: (55)

no prob, just sell it i'm sure someone needs a block like that. so if you go iron will it be 370 or 408? whats your goal again with the car?

my car is done pretty much i just have to finish the interior and order up the GV OD for the th350 so i can cruise it on the power tour this year. six spd auto here i come

NassyVette

iTrader: (22)

Actually I need the block...for a '75 stingray hybrid I've got in the works. If I go with the iron block I'll probably be going 370ci. You think the cam I have will work good with a 370? I'm just trying not to get into a never ending money pit here...can I still go with a stock crank/main caps on an iron block? I'll hit you up with a PM after the holidays. Merry Christmas, I'll talk to you soon.

Moparnos (The SLP Guy)

iTrader: (55)

nice i like lsx swaps into older cars. that cam will be just fine for what you want. so lets see 4.03" Bore, 3.622" stroke, -15cc dish piston 72cc chamber head, .054 head gasket crush thickness should be around 8.7:1. you don't really need to run lower than that to get what you want out of it. you can even run a t88 if you make it fit in there which you can. what fuel setup r u doing?gear?trans? merry xmas to you too.