Chevelle updates

[VintageMusclecar]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jim Ferron</div><div class="ubbcode-body">Eric, Man it's great to see you have so much enthusiasm for getting your combo dialed in! My get up and go...got up and left.

Please update us all on you combo [I've sure it's listed more than once in the 55 pages ..

496 4 speed I know..[true 496 or 489?]

Carb?
Gear?
Intake manifold?
Distributer?
Heads big port open chamber?
Compression ratio?
Roller cam?

Thanks, When you are done with your car will you do mine for me? [img]<<GRAEMLIN_URL>>/[/img] </div></div>


Thank you Jim. [img]<<GRAEMLIN_URL>>/smile.gif[/img]

496: 4.310 X 4.250
10.5 compression
BONE STOCK 291 heads (soon to be replaced with ported 840's)
2.19 1.72 valves
Crane 131311 solid flat tappet cam: 256°/264° @ .050, .618/.638 lift
Crane stamped steel 1.7 rockers
99893 springs
163 intake, stock except for plenum divider removed
1000 HP Holley built in-house
OEM points distributor with Crane XR-i electronic conversion
Hedman 65002 headers (2&quot; primary 3&quot; collector)
3&quot; Torque Tech exhaust w/X-pipe and Walker #17665 3&quot; mufflers
Legend 5 speed manual trans: 2.66, 1.78, 1.30, 1.00, .69 OD.
12 bolt with 4.56 gears
M/T Drag Radial 275/60/15
Car weight-unknown at this time but approx. 3800+ with me in it

I would be more than happy to help you with yours any way I can.

[VintageMusclecar]

First pass--I wasn't expecting it to hook, took me a bit by surprise:



Compare to 2nd pass where you can clearly see it blew the tires off the line. Also note the track guy mopping fluid from my lane from the car before me:



Alternate view of 1st pass:



Alternate view of 2nd pass--note the car nose over about mid-track...this is when my hand slipped off the shifter causing me to miss 3rd gear. I stuffed it back in gear and drove it the rest of the way down:



Time slips:

[Jim Ferron]

If memory serves me the 291 and 840 heads are semi interchangeable [except maybe for the spark plugs..one was a small plug if I remember..] I think they CC'ed within 1 0r 2 CCs...

Are you thinking maybe you'll need a bigger, better intake manifold with the ported heads?

Any reason you went closed chamber in the original build?

[VintageMusclecar]

I have several intakes I can use, but I'm planning on staying with the stock 163 as I don't think it will be much (if any) of a restriction on this build. I've already tested a heavily ported Holley Strip Dominator on this engine (during the last dyno session) and the power differences were low single digits.

Why I chose closed chambers--I wanted to see what I could do with them since everyone's always so quick to dismiss them.

[markjohnson]

Oh snap! I didn't realize that you had the infamous Crane #131311 camshaft in that motor. Crane really hit onto something with that great camshaft and Ive known many cars that have flown with it. One in particular was an early Camaro , crate LS6 with that exact camshaft that spit out 10.60's.

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: markjohnson</div><div class="ubbcode-body">Oh snap! I didn't realize that you had the infamous Crane #131311 camshaft in that motor. Crane really hit onto something with that great camshaft and Ive known many cars that have flown with it. One in particular was an early Camaro , crate LS6 with that exact camshaft that spit out 10.60's. </div></div>

DAMN!!


Eric, thanks for clearing that up. I see problems in your NEAR future!!!! When you switch out the heads, you might as well put the rollbar in?
Not sure about your track there, but around here I think 11.99 they are looking for them, 11.49 I think it's a MUST unless your a late model 'Vette/Viper.

Good luck. I &quot;might&quot; get around to posting my ZL-1 build. Been a couple years in the making, but I'm sure it will be worth it.

BTW, how do you like the Legend 5sp? What are they rated for? I have a Nash 4+1 for my '69 Nova I'm think about using, but not 100% on that? I haven't seen much on-line with regards to what these trans can handle? Looking for 900Hp 800lbs/ft range in a 3000lbs car for the street.

John

[VintageMusclecar]

John;

The car has EASY 11's in it now, like I said though the driver (me!) needs a LOT of practice to get it there though.

The &quot;official&quot; cut-off is supposed to be 11.49 for a rollbar (excluding some late model stuff), but often there's some discretion involved, at least on T&amp;T night. I know of two other local racers who've already been in the low 11's w/o a bar or cage and they haven't been sent packing yet.

I would be very interested in seeing your ZL1 build.

So far I'm very happy with the Legend. As I've said previously it's BIG and it's pretty heavy, and it is a little noisy when it's cold--much like an M22, but it quiets down once it's warmed up.

Is your Nash an early torque tube type?

As an aside, I made an interesting discovery with the Chevelle today, follow-up post coming in a moment....

*edit* waiting on Photobucket to do its thing with a video [img]<<GRAEMLIN_URL>>/rolleyes.gif[/img]

[EZ Nova]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: VintageMusclecar</div><div class="ubbcode-body">John;

The car has EASY 11's in it now, like I said though the driver (me!) needs a LOT of practice to get it there though.

The &quot;official&quot; cut-off is supposed to be 11.49 for a rollbar (excluding some late model stuff), but often there's some discretion involved, at least on T&amp;T night. I know of two other local racers who've already been in the low 11's w/o a bar or cage and they haven't been sent packing yet.

I would be very interested in seeing your ZL1 build.

So far I'm very happy with the Legend. As I've said previously it's BIG and it's pretty heavy, and it is a little noisy when it's cold--much like an M22, but it quiets down once it's warmed up.

Is your Nash an early torque tube type?

As an aside, I made an interesting discovery with the Chevelle today, follow-up post coming in a moment....

*edit* waiting on Photobucket to do its thing with a video [img]<<GRAEMLIN_URL>>/rolleyes.gif[/img] </div></div>

Eric, WATCH that T&amp;T running faster! I did that with my Nova back YEARS ago (1996 maybe). Went to a T&amp;T and was still 1/8 miling the car due to no rollbar. Well to other cars pitted by me were UNDER the 11.49. One was 11.20's and the other went 10.80's, like 3/4 passes each. So I went the full 1/4. The only time I did that with that combo, 1 1/4 pass. Went 10.47. Guy came over like nothing saying nice car, how fast what's done etc etc. Well he was THE track guy and promptly told me I was done for the day! I told him it must be a mistake as the cars not that fast. I want and asked for 1 more run, out the back door just to see that it wasn't that fast (lol I knew it was a mid 10 car). I wanted to try the NOS on the last hit, but wasn't allowed.

My Nash is set-up as torsion tube at this time. But I also have a whole gear set and tube to make a NON torsion tube trans as well.

My '69 Nova that the ZL_1 is going in with the Nash is a FULL 10 point, 8.50 certified car now. Car will look &quot;mostly&quot; stock. Will have headers, shifter, rollbar. I'm thinking of keeping the 15X8 rallys with a 275 Dr PRO tire. Looking for low low 9's or maybe an 8 with &quot;198&quot; intake on too.

Just a mild little streetcar! [img]<<GRAEMLIN_URL>>/beers.gif[/img]

[VintageMusclecar]

FINALLY!

No WONDER I couldn't find/hit my shift points.

Click the pic:

[Postsedan]

I would think that tach can be repaired.....no need for a new one. I really like the 10 grand tach.

Dan