Still Need 383 Help!

[Turbo T/A]

Still trying to get my combo together & running properly....it is driving me insane!!! I am almost at the point in giving up on this 383 poo & going to a 406 this winter. I have yet to see 1 406 run bad times!

Here it goes AGAIN!


383
KB .100" domes 11.9:1 w 64cc head, .039" & 0 deck ( havent been decked & using a .040" gasket. Figuring 11.5:1
World Products Sportsman II's (IO37 head casting #)
Comp XE284 hydraulic flat-tappet (240/244 @ .050" .507/.510 lift) Stamped Steel 1.5's
Edelbrock Performer RPM intake, gasket matched
Holley Street Avenger 770cfm VS carb, 72/76 jets (72/75 stock)
1 5/8" headers, 2 1/2" exhaust
Holley Strip Annihilator box/Lasershot 500 coil & MSD Pro-Billet Dist.
Timing 16/36 with med/med springs
Fuel Press 7 idle/6.5 WOT
700R4, 2200 stall (stall little small for cam)
4:10 rear

Problem i have is that i think it should pull more MPH.....racing friends 103mph car from roll it is side by side.....i just think i should be quicker than that.

I know the c/r is a little high, i only run 110 at the strip but cruising i use Ultra 94 (sunoco)

ANy help/suggestions is always appreciated. At 21 yo, i only have so much experience & its hard to think of all the damn possibilities!

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'81 Viper Blue Z-28
383 Stroker
4:10 Rear End
Custom Built 700R4 w/ 2200 stall

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[This message has been edited by Stroked-Z (edited July 09, 2002).]

 

[TwinTurbo79Z28]

I think if you have your motor tuned up. Little more stall, little less gear?? that 700 has a pretty low first gear...

What are ya getting out of it?? et/mph/trap rpm. 60's??

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Shut up, get in, sit down and hold on... Why are you looking at me like im crazy??

[This message has been edited by TwinTurbo79Z28 (edited July 09, 2002).]

 

[2x4]

just curious, are you detonating with that that compression? i'm running 11.2:1 and am terrified of detonation. i have a cam thats a lot bigger than yours to bleed off a little of it. my engine guy said to basically ignore the compression ratio & work on a quench of .035ish, then if its still high time to worry. anyway....

i think you need a little more cam & a lot more converter. youll never get off the line good with the 700r4 & 4.10's, but you should really make up for it down track & in mph. for comparison, i'm running a 10" converter (~32-3500 stall),th350 & 3,23 gears with bfg drags. in theory the tall gears will help me get off the line better. how high are you reving it? i would have at least a vic jr or better intake too.

 

[2x4]

btw- nice car! looks good!

 

[Turbo T/A]

Thanks for the compliments/suggestions this far.

Honestly i havent been to the track yet so i may have jumped the gun already. But i do know it isnt up to my satisfaction at all.

Just ate my 3rd 700R4, hopefully i'll have it back tommorrow & up this weekend at the track for some numbers...

Weird thing is no detonation on the 94, but then again i dont drive it hard without the 110 in there, I rev it to about 6000...pulls OK but just not how i feel a stroker with some good heads/intake should.

Maybe i am wrong about this & am expecting too much from it. This weekend (knock on wood) i will try & get up there for an ET/MPH

Last yr ran a 13.4@101.5 w/ 1.9 60-ft. It was dying bad in the topend (had a bad fuel pump i think)

I will get you guys updated. And you are right, the 3.06 + 4:10's dont work well off the line, but on slicks i hope it will launch good.

Told the tranny builder if this 700 grenades again, i want a th-350 with a 3000 stall.......all under warranty.

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'81 Viper Blue Z-28
383 Stroker
4:10 Rear End
Custom Built 700R4 w/ 2200 stall

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[2x4]

that 60' time is pretty good for the e.t. friday we ran a friends camaro & got a 12.52@107mph with a 1.82 60'. we wre trying my new bfg tires and didnt really have a handle on them yet, but that was your old combo right?
run it and let us know, you may be surprised!
the good side of breaking trannies is that your making power & hooking

 

[Turbo T/A]

I ran that old time (last yr) with my bad pump (only 3psi @ idle) and with the cam installed 4 deg advanced. As well as "unkown heads" (no casting #'s, ground off?)

Now what i've changed is the fuel pump (Holley Blue), I've changed the tranny (700R4 w/ 2200), the heads to Sportsman II's unported, and i moved the cam to straight up.

Hoping to see some decent MPH & get away from this 101 crap!

Only thing i dont like is the quench distance with this setup. I mean an undecked block, domed piston & .040" felpro gasket cant be good for quench right?

Could this be the reason why it runs like A$$.

You know maybe i'll just run the thing like i said & get back to you all. Just trying to workout the bugs before the track & for christ sakes, keep a tranny together (clutch packs)

THX for the advice & vote of confidence. I will be posting times HOPEFULLY this weekend if my damn tranny guys fix this up.

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'81 Viper Blue Z-28
383 Stroker
4:10 Rear End
Custom Built 700R4 w/ 2200 stall

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[TwinTurbo79Z28]

Hey Stroked, when i spoke with Comp tech about my XE274. I was strongly advised to install it straight up. I was told by Comp that the XE series theoretically has "4 degress of advance ground into the cam". Just for haha's and experimenting, I played with my cam timing once and advanced it 4 degrees, ran like dog doo.

Where exactly does the motor fall off the cliff??

Maybe just on a whim, you wanna back up that cam and see how she runs..

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Shut up, get in, sit down and hold on... Why are you looking at me like im crazy??

 

[Turbo T/A]

Hey man

I have already backed up the cam this winter. It was at 4 deg advanced, but now its at "straight u["

motor still dies at around 5700-5800rpm.

In 1st though, it revs fine, 2nd it dies a bit, 3rd a lot. Any idea's?

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'81 Viper Blue Z-28
383 Stroker
4:10 Rear End
Custom Built 700R4 w/ 2200 stall

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[jakeshoe]

Stroked,
Sounds to me like you are running out of fuel, not cam.
If it pulls clean in 1st to XXX rpm, then shifts and pulls for a bit and starts to fall on face it is probably a fuel related issue not cam.
If a cam will pull good to XXX rpm in 1st it should do the nearly the same in 2nd and 3rd.
The lower 1st gear ratio might mask a cam problem somewhat because it has more torque multiplication and revs quicker but you should still feel a the power curve falling off if you are getting out of the engines rpm range.
What type of fuel system are you running?
Line size, carb cfm, fuel pump, etc..