LT1-LT4 Modifications 1993-97 Gen II Small Block V8

9 second car goal

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Old Jun 15, 2004 | 10:42 PM
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Default 9 second car goal

Okay so a couple of weeks ago I installed a CC306 cam in my friend's 97 Z28 A4 vert. It has full bolt ons, 12 bolt w/ 373's, slicks, 3600 stall, and 150 shot of NOS. The fastes pre cam run was 11.56. Since then the cage has been installed and obviously a cam.

Now down to business....this same guy is getting a large sum of money from a motorcycle accident a year ago...ill just say close to 6 digits. Anyways...he is investing a lot of it...but wants this car to hit 9's and still be able to drive occassionally....we know itll be a race car but just want it to be able to cruise up to the local sonic. Here is our recipe so far....
-forged 396 shortblock
-Ported and polished LT1 heads/ Intake with bigger valves for heads
-CC306 Cam
- 58mm t/b
-300+ wet shot
- TH350 or TH400 suggestions? with transbrake and 5000+ race converter
-3200 lbs race weight

Do you think this will get him there? The budget is big....so any other tips would be appreciated....I just wish this was my car..
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Old Jun 16, 2004 | 10:33 AM
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cmon lt1 gurus
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Old Jun 16, 2004 | 10:55 AM
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dont forget you need to be able to put that power to the ground. Alos need some slicks and skinnies up front. But if the motor is around 450hp all bye its self with a 300 shot on top of it. If the motor dont blow up, you should make it into the 9s.
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Old Jun 16, 2004 | 11:43 AM
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3200 race weight is a lofty goal for a convertable. scrap the lt1 heads and go with big afr's.ditch the cc306 and go with a cam to match the flow of the heads.

make sure it has a 9" or 12 bolt,th400 (dont mess with the 350) and see what happens.
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Old Jun 16, 2004 | 12:06 PM
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yep....already got the 12bolt.....and every rear suspension part is bmr...or spohn....need HAL shocks I'm thinking though. The motor is gonna be all forged and he was thinking the new NOSzle direct port...300 shot. How come th400 vs th350? why the difference? I thought 3200 was a lofty goal for a convertible. What's more realistic. He just wants carpet and radio. Cage is still gotta be there....what weight do ya'll think? Bogarts with slicks and skinnies are a must obviously.
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Old Jun 16, 2004 | 12:25 PM
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You'll definitely need a built suspension and slicks. Instead of a hydraulic roller, get a shop to recommend a solid roller to match some AFR heads. With that and nitrous you shouldnt have too many problems. Good luck!
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Old Jun 16, 2004 | 12:46 PM
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Ok thanks a lot enis guy.
Now why the th400 over the th350?
What kind of weight will we most likely get out of this car?
We're thinking almost 800hp to the tires is needed
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Old Jun 16, 2004 | 02:43 PM
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The nitrous needs to be tunable so I'd get a controller to go with the direct port. As previously said, a nice set of AFR heads (meaty castings) and a custom cam to go with the COMBO will make the power. Getting it to the ground is another story. For a heavy nitrous car I wouldn't waste my time with a Th350. To get it to live and live happily will cost you more than a nicely built Th400. What you lose in efficiency in the Th400 you'll gain back in reliability.

Since it sounds like your relying more on the nitrous to get you down the track than the motor, you need to make sure your N20 setup is flawless. Don't skimp or you'll be sorry.
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Old Jun 16, 2004 | 09:00 PM
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Originally Posted by Jordan57
Okay so a couple of weeks ago I installed a CC306 cam in my friend's 97 Z28 A4 vert. It has full bolt ons, 12 bolt w/ 373's, slicks, 3600 stall, and 150 shot of NOS. The fastes pre cam run was 11.56. Since then the cage has been installed and obviously a cam.

Now down to business....this same guy is getting a large sum of money from a motorcycle accident a year ago...ill just say close to 6 digits. Anyways...he is investing a lot of it...but wants this car to hit 9's and still be able to drive occassionally....we know itll be a race car but just want it to be able to cruise up to the local sonic. Here is our recipe so far....
-forged 396 shortblock
-Ported and polished LT1 heads/ Intake with bigger valves for heads
-CC306 Cam
- 58mm t/b
-300+ wet shot
- TH350 or TH400 suggestions? with transbrake and 5000+ race converter
-3200 lbs race weight

Do you think this will get him there? The budget is big....so any other tips would be appreciated....I just wish this was my car..
FIRST GET RID OF THE STOCK HEADS the bigger valves dont help flow on these heads the chamber is so small they shroud the valve to much. second the 350 turbo with a good drum and man. vb is a must . the 350 will not use up as much power pluse hase a close ratio . how did you get the car that lite. and that is too big of a converterthe 396 makes lots of torque dont wast it. you will need a good fuel system to spray that much. need any advice email me i will try to help one of the cars i built had that same cam phil
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Old Jun 17, 2004 | 09:10 PM
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the TH350 can be built to handle the power,but how long will it do it reliably and for what price? Bullet proof TH400's are all over,and just that much more reliable.
George Baxter has done some extensive weight mod's to his 97 ss vert,and i think it's around 3300 without driver.
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Old Jun 17, 2004 | 11:59 PM
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another thought- what's the spline on your 12-bolt? My guess would be to put up with that much torque spraying from the line you'll probably need at least 35.
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Old Jun 23, 2004 | 10:56 AM
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Okay...enis guy this is probably your specialty....this is the new plan....
-all forged 396 short block
-solid roller blower style cam
-AFR 210's or NO RUSH INC fully ported lt4 heads
-LTX sheetmetal intake
- ????? Throttle body? is there one bigger than 58mm for this application?
- Supercharger w/intercooler and aftercooler....w/ about 25psi boost...which trim? is there a kit for this?
- th400
- 12bolt w/ 3:73s
-3400lb race weight

what do ya'll think
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Old Jun 23, 2004 | 11:24 AM
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Originally Posted by Jordan57
Okay...enis guy this is probably your specialty....this is the new plan....
-all forged 396 short block
Personally I'd do a 383 to get a thicker ring land and better rod to stroke ratio since your going to have to have custom pistons made with a deent dish unless your going to go to a bigger head.

-LTX sheetmetal intake
Huh? It's either a sheetmetal intake or a an LT1/4 intake. For forced induction, there is no real point to a custom intake unless you just want to spend money. I'd personally take an LT4 and do what you need to do.

- ????? Throttle body? is there one bigger than 58mm for this application?
- Supercharger w/intercooler and aftercooler....w/ about 25psi boost...which trim? is there a kit for this?
There is a monoblade throttle body from Arizona Speed and Marine. I haven't seen one bigger than that. To get 25psi of boost you'll need YS and since your there, you might as well go with the latest and greatest which is the YSi. Keep in mind this will not be a bolt on and custom fabrication will have to be done.
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Old Jun 23, 2004 | 11:46 AM
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I just thought that intake would make more power...guess not. So the 383 will make enough power with the supercharger? What will need to be fabbed up? Sorry for all the questions its just we are trying to build a garage built 9 sec car
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Old Jun 23, 2004 | 12:02 PM
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and this was the intake i was talking about
http://home.wideopenwest.com/~squinn0039/ltx.html

also they have heads on there...so may go that route with the matched intake on top of the stroker...with the solid roller cam of course
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Old Jun 23, 2004 | 03:08 PM
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Originally Posted by Jordan57
and this was the intake i was talking about
http://home.wideopenwest.com/~squinn0039/ltx.html

also they have heads on there...so may go that route with the matched intake on top of the stroker...with the solid roller cam of course
Ahhhhh, Steve's intake. Thats a nice piece but once again since you are using forced induction the money isn't as well spent.
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Old Jun 23, 2004 | 03:17 PM
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Originally Posted by Jordan57
I just thought that intake would make more power...guess not. So the 383 will make enough power with the supercharger? What will need to be fabbed up? Sorry for all the questions its just we are trying to build a garage built 9 sec car
Whenever you throw forced induction into the mix it changes everything. Small blocks act like big blocks.....well, don't need to state the obvious

I believe Chris Zikora (Goes by Z8's on this board) can answer any question about the particular fab'ing needed to be done since he's the last one I know who's currently running that setup on a SBC (not LS1) based motor.
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Old Jun 24, 2004 | 10:36 AM
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Go with a YS/YSI supercharger you wont be sorry, I had the YS on my car and loved it. My car ran mid 9's @142 with it with a 8-ribbed belt and only 15-16 pounds boost, Have now switched over to a YSI with a cog belt set-up and picked up over 100hp over my previous setup...will be testing at the track in the next few weeks
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Old Jun 24, 2004 | 12:12 PM
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Originally Posted by ROBS SS
Go with a YS/YSI supercharger you wont be sorry, I had the YS on my car and loved it. My car ran mid 9's @142 with it with a 8-ribbed belt and only 15-16 pounds boost, Have now switched over to a YSI with a cog belt set-up and picked up over 100hp over my previous setup...will be testing at the track in the next few weeks
Nice to see you still going strong with the combo Rob. I thought you had sold it!
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Old Jun 24, 2004 | 12:15 PM
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Sounds good so far....one more option we were looking into was N/A....the dominion heads or something like that....single plane intake...i.e (victor).....with a throttle body on top....with a big cam.....what kinda power are those setups producing and how much....just throwing it out there
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