[Z06] 402 vs. H.C.I
Thread Starter
Burning Brakes
Joined: Apr 2007
Posts: 1,030
Likes: 1
From: Douglasville Ga
402 vs. H.C.I
trying to do the comparison to see if it would be more beneficial for the strip; to drop a 402 in the 2003 Z or to go with the head/cam package. What is the normal $$$ for a complete 402? I have seen some replacement 347 for around $2300.
Collections Hold
Joined: May 2003
Posts: 3,520
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From: Tacoma WA
My 408 short block, fully built to my specs, was about $4k. I reused my stock LS6 heads and intake, but did opt for a small cam. The added 50ci and cam/headers was good for 430rwhp and 450rwtq. H/C packages vary in over all HP, but I think the added cubes is the biggest gain? Once we have the $$, another cam and heads and a 500hp n/a motor can be had.
Another alternative is nitrous. I made my original LS6 into a 10 sec rocket, 100% bonestock with just a small dry shot. This can be done safely for under $1k.
Robert
Another alternative is nitrous. I made my original LS6 into a 10 sec rocket, 100% bonestock with just a small dry shot. This can be done safely for under $1k.
Robert
Thread Starter
Burning Brakes
Joined: Apr 2007
Posts: 1,030
Likes: 1
From: Douglasville Ga
I don't really know too much about Nitrous, but I want something that I can also drive around town. Something that if the need arises, i can step on it and feel the tq without having all the purging stuff to go through.
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Joined: May 2003
Posts: 3,520
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From: Tacoma WA
Purging is really not needed when running a dry shot. with the advant of the NANO technology the bottle heaters are no longer needed. So a system that is always ready and on-line can certainly be done these days.
Now with that said, I do understand having the n/a power at a nice level for every day driving and am very happy with mine. Once you get your n/a power goals you could always add the extra N2O power later.
Robert
Now with that said, I do understand having the n/a power at a nice level for every day driving and am very happy with mine. Once you get your n/a power goals you could always add the extra N2O power later.
Robert
Thread Starter
Burning Brakes
Joined: Apr 2007
Posts: 1,030
Likes: 1
From: Douglasville Ga
So is $4K about right for a drop in 402 assuming I do all the install myself. Just wondering if i can then use my exsisting oil pan, water pump, headers, etc, or if I will need to purchase all of this, or if the drop in engine comes with all the neccessary equipment.
Instructor
Joined: Feb 2007
Posts: 240
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From: Lewistown MT
Collections Hold
Joined: May 2003
Posts: 3,520
Likes: 2
From: Tacoma WA
I had a shop install mine for two reasons, first was an injured back, second was no lift as the motor comes out from the bottom in the cradle. However, i do know some have done it from the top. Most everything was plug and play. The only issue for the LQ9 was the reluctor wheel having a different number of teeth and not sure how the shop dealt with this, but they reused the LS6 one or modded the LQ9 one. Whom ever does your short block will have the answer/fix.
Robert
Robert
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Safety Car
Joined: May 2006
Posts: 3,799
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From: Northern Virginia
St. Jude Donor '08
If your on a budget (and who isn't these days), you might want to consider going the forced induction (FI) route. Look at supercharger kits from ECS and A&A. Probably the best bang for the buck.
Car will drive like stock until you step on it.
Just a thought.
Car will drive like stock until you step on it.
Just a thought.
Le Mans Master
Joined: Feb 2001
Posts: 6,777
Likes: 358
From: West "By God" Virginia
CI 7-8-9-10 Veteran
This is just hear say...but I once heard of a guy that ran nose to nose on the interstate (i know it's not drag racing) in his EB Z06 H/C/I (450rwhp) and 373 gears with a C5 that had a 434ci 520rwhp car from 70-140ish!!
I think RobZ has hit 9's with his H/C/I 346 stock bottom end and 410's!! Just food for thought!!
I think RobZ has hit 9's with his H/C/I 346 stock bottom end and 410's!! Just food for thought!!
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Joined: May 2003
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From: Tacoma WA
Thread Starter
Burning Brakes
Joined: Apr 2007
Posts: 1,030
Likes: 1
From: Douglasville Ga
Are most GM motors, like the 402 or 427 bolt in? I use that term loosely knowing there is a lot more involoved, but i am curious if they require any MAJOR body/drivetrain modification. Will they bolt up to the clutch and other parts?
Team Owner
Joined: Nov 2001
Posts: 34,124
Likes: 105
From: Pensacola FL
I had a nice H/C set-up (436/420 N/A, 576/590 on the bottle) in my LS1 Z28 and it was really fun. However, when I replaced it with a 383 (465/460 N/A, 650ish/650ish on the bottle) it changed the whole character of the car. Torque everywhere! I'd take the stroker everytime over the best H/C set-ups...
I'm still weighing what I want to do, but I'm seriously considering putting my Z16's LS6 on a stand and dropping in a 402/427, but FI is also tempting...
I'm still weighing what I want to do, but I'm seriously considering putting my Z16's LS6 on a stand and dropping in a 402/427, but FI is also tempting...
Safety Car
Joined: May 2006
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From: Northern Virginia
St. Jude Donor '08
Also, you need to change radiator. It's marginal at best and with bigger motor you will have a lot more heat to deal with.
Team Owner
Joined: Jan 2007
Posts: 31,233
Likes: 201
From: Utah
What's going to be the best thing about the 402 is you're going to have torque everywhere. You won't have the loss of power down low. It's going to pull no matter where you are at in the power band. That is going to be my next step.
I went with you H/C/I first and it cost me about 6k for everything including install. Either way you go though you are going to be very happy I believe.
I went with you H/C/I first and it cost me about 6k for everything including install. Either way you go though you are going to be very happy I believe.