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72SSLS5Chevelle Profile
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Registered: 10-2010
Location: Central Florida
Posts: 71
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Factory Stock 4 speed guys...


What are you running for a clutch/flywheel set up? I currently have a billet steel flywheel, but was considering swapping to an aluminum flywheel.

First of all, is it legal?

Second, would it help me control some wheelspin off the line with my set up?

Not trying to set any records, or even win an event. Trying to make the car easier to launch on a limited tire. (I know, an oxymoron)

I am building an LS5 to 72' specs, have a wide ratio M21 4 speed, and have yet to decide on gear ratio yet. (leaning towards 4.10's) The car is full weight, buckets, console, PS, A/C, etc.

This is all new to me if you can't tell, hoping some more experienced/seasoned racers will throw me a bone and point me in the proper direction.

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1972 Chevelle SS 454/4 speed "tribute"
F/S car - almost done.
1969 Chevelle 2dr Hardtop - next on deck.
10/23/2010, 10:53 pm Link to this post Send Email to 72SSLS5Chevelle   Send PM to 72SSLS5Chevelle Blog
 
1971ls6 Profile
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Registered: 02-2010
Posts: 13
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Re: Factory Stock 4 speed guys...


Aluminum flywheel is illegal, I would run the center force dual friction. The right gear will be a 4.30, 4.10 is not enough and 4.56 is too much, ask Jim lerum, he will tell you the same. The wide ratio is the correct trans

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1971LS6 corvette
12.47 @114.8 psmcdr 2010
10/24/2010, 7:15 pm Link to this post Send Email to 1971ls6   Send PM to 1971ls6
 
John Brown Profile
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Registered: 02-2009
Location: South Bend, Indiana
Posts: 77
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Re: Factory Stock 4 speed guys...


Go with a Cowl Induction hood and air cleaner if you are serious about going fast. With trap speeds around 105-110 you will get plenty of ram and cooler denser air too.

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John Brown
10/24/2010, 9:06 pm Link to this post Send Email to John Brown   Send PM to John Brown
 
72SSLS5Chevelle Profile
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Registered: 10-2010
Location: Central Florida
Posts: 71
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Re: Factory Stock 4 speed guys...


Good to know, glad I didn't buy one. I read somewhere that all LS5 eqipped cars had an M22 in 1972. Am I going to have to ditch my current trans and source an M22 to be legal?

And if an aluminum flywheel is out of the question, I suppose an aftermarket driveshaft is a no go too?

Thanks for the responses gentlemen. I appreciate the help.

---
1972 Chevelle SS 454/4 speed "tribute"
F/S car - almost done.
1969 Chevelle 2dr Hardtop - next on deck.
10/24/2010, 11:45 pm Link to this post Send Email to 72SSLS5Chevelle   Send PM to 72SSLS5Chevelle Blog
 
72SSLS5Chevelle Profile
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Registered: 10-2010
Location: Central Florida
Posts: 71
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Re: Factory Stock 4 speed guys...


quote:

John Brown wrote:

Go with a Cowl Induction hood and air cleaner if you are serious about going fast. With trap speeds around 105-110 you will get plenty of ram and cooler denser air too.



Yeah, I saw how crappy the non flapper hood air cleaner is. But the car is already painted and fitted.

Image

I assume that if you run the flapper hood, it has to be 100% functional?

---
1972 Chevelle SS 454/4 speed "tribute"
F/S car - almost done.
1969 Chevelle 2dr Hardtop - next on deck.
10/24/2010, 11:48 pm Link to this post Send Email to 72SSLS5Chevelle   Send PM to 72SSLS5Chevelle Blog
 
GreenLS6 Profile
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Re: Factory Stock 4 speed guys...


Nice car, hope to see you out havin fun.
 I myself would go with the 4.10 and wide ratio. The LS5 isn't going to be winding as high as an LS6 and the 5 makes more LOW end torque -plus more drivability.well a little more.
10/27/2010, 12:34 pm Link to this post Send Email to GreenLS6   Send PM to GreenLS6
 
72SSLS5Chevelle Profile
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Registered: 10-2010
Location: Central Florida
Posts: 71
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Re: Factory Stock 4 speed guys...


quote:

GreenLS6 wrote:

Nice car, hope to see you out havin fun.
 I myself would go with the 4.10 and wide ratio. The LS5 isn't going to be winding as high as an LS6 and the 5 makes more LOW end torque -plus more drivability.well a little more.



Thank you for the kind words. That's my thoughts on the gears too.



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1972 Chevelle SS 454/4 speed "tribute"
F/S car - almost done.
1969 Chevelle 2dr Hardtop - next on deck.
10/27/2010, 7:56 pm Link to this post Send Email to 72SSLS5Chevelle   Send PM to 72SSLS5Chevelle Blog
 
CortezLS6 Profile
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Registered: 08-2007
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Re: Factory Stock 4 speed guys...


Nice car is right. How did I miss these pics?

Jim

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Pure Stock LS-6, 4 Speed
12.21@115.32 2009 PSMCDR
5/21/2012, 11:07 pm Link to this post Send Email to CortezLS6   Send PM to CortezLS6
 
72SSLS5Chevelle Profile
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Registered: 10-2010
Location: Central Florida
Posts: 71
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Re: Factory Stock 4 speed guys...


Thanks Jim, I am still working on it as time allows. In the middle of a complete front end rebuild currently. The long block is together, but I am having PTV clearance issues. No idea how, stock cam, pistons, valve sizes, etc. Pistons are .010" in the hole, .020" head shims, heads cut to 100cc from 113cc. I degreed the cam, it checked in perfect. (Crane blueprint LS5 camshaft)

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1972 Chevelle SS 454/4 speed "tribute"
F/S car - almost done.
1969 Chevelle 2dr Hardtop - next on deck.
5/22/2012, 6:14 pm Link to this post Send Email to 72SSLS5Chevelle   Send PM to 72SSLS5Chevelle Blog
 
GreenLS6 Profile
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Registered: 02-2010
Posts: 50
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Re: Factory Stock 4 speed guys...


holy crap.... from 113cc down to 100cc !!! How much did you Mill off the heads NHRA Min . is 105cc and thats alotta milling.
Are the valves hitting or just low clearence ?
6/14/2012, 12:07 am Link to this post Send Email to GreenLS6   Send PM to GreenLS6
 


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