meine96ws6

iTrader: (4)

The car has been driven a lot, no issues.

427zm

iTrader: (9)

Thompson Motorsports for your new motor FTW!

Gunslinger09

Bone stock 98? Probably the oilpump gave out. remember they had problems with the preassure bypass spring hanging open on new cars of that model year so the oilpumps were ticking time bombs.

Sinister_Z28

Yeah thats what i guessed was the oil pump failed. But whatever its done now. I started to pull the motor appart and found metal shavings in my intake and the hole is actually about three inches. Ill load pics when i can figure out how. Now what is the power difference between a 408 and a 383 if they both had a similar top end. Also will a LS2 block work if i wanna stroke it. And what in the hell is a LQ4 that i keep hearing about.

Gunslinger09

LQ4 is the Iron truck block. A 408 is a 4.060 bore with a 4 inch stroke. The 383 has the same stroke but a bore of 3.9 based off the 5.7L. The LS2 block will work for a 408 wich will make much better power than the 383. The bigger bore will move more air early in the intake stroke so it will make the power at a more usable RPM range.

Sinister_Z28

Ok so i was thinking of buying a LS2 block and a 402 rotating assembly from TSP. Will i need to have the block bored at all to accomodate the 402 assembly. And will the LS2 block bolt directly into my LS1 engine mounts. Basically will i need to rearrange my engine bay. Also this is my first stroker so sorry if i ask any dumb questions.

jetboat

I had 235 hours on A LQ9 in my boat and lossed #7 and #8 rods and pistons. I thank it was #8 piston that started it. crank and rod bolts where ok. Holes in both sides of block. PS A 408 is 4.030 bore.

Sinister_Z28

So with a 6.0L LS2 block i wouldnt need to bore it if i wanted to run a 402 rotating assembly. And yeah this is the first block i have blown up. I cant wait to get the motor pulled and see what in the hell went wrong.

Sinister_Z28

Here is a pic of my ruined block.

RezinTexas

a 402 is a 4.000 bore and 4.000 stroke. It would work, but you would need to hone the cylinders a little if you get a used block.

Marc3.4V6

iTrader: (1)

X2, seems young for an LS motor. I also would think it's an oil pump failure being a 98.

Paul Bell

iTrader: (9)

I agree, you should stay with an aluminum block. An LS2 would be ideal.

Peruse the sponsors and find a short block that's already stroked and/or with a bigger bore. Make sure they use upgraded rod bolts and a ported oil pump. To save money, your stock heads should be good but they should be rebuilt by a competent shop. Make sure the valve springs match whatever cam you're gonna use.

Be aware that some blocks have sensors in different locations such as cam and knock sensors.

Always use new bolts where you can. You should invest in ARP head bolts.

While you have this all apart, a UMI tubular K-Frame would be a great addition.

Sinister_Z28

Tubular K Frame? And i have heard with 402s that some people run LS7 heads. Can i eventually do that. And as far as oil pump would a ported LS6 work

Paul Bell

iTrader: (9)

Yes, a ported LS6 pump is pretty good. As I recall, the LS7 heads will only fit the 4.125 bore of the LS7 block due to valve sizing. Somebody wanna confirm or deny this for me?

Sinister_Z28

So how much power will a pretty much stock 402bottom make

badazz81z28

iTrader: (6)

ummm. Actually yes, that is a lot of miles. Not saying it can't perform, but with that many miles on it anything can fail at any moment. To some people's amazement...parts do wear out. You will never convince me a Corvette, F-body, GTO etc with 170K on the clock didn't live through some abuse.

35th SS

iTrader: (2)

good advise moderator on a ls6 ported pump. u are correct ls7 heads wont work for his setup and like you mentioned unless he has an ls7 block.I concur.

Sinister_Z28

So with a 402 if i use my LS1 top end will i jave any clearance issues. Now i know it wont perform to its fullest potential but will it work

lemons12

iTrader: (71)

Wanting to run a stock ls1 top end with a 402..

A. Sounds like you are on too tight of a budget for a 402
B. Sounds like if you don't start researching you will be very upset

Sinister_Z28

I understand where ur coming from lemons12 and yes i have put myself on a tight budget because i dont have loads of time to get this done. Im not trying to cut corners here but i read on another thread that u can run a LS1 top end on a 402. Now granted i know it will probably run like my stock 5.7L. I basically dont want to drop ten grand all at once i would rather spread out the spending over time and i have to get this done before February 12th because the car needs to be running before i go to Boot Camp. So basically what could i do to be happy with a 402 without destroying the bank. Like a aftermarket cam, bolt ons, ect?