About half the people who ask me about my little Weiand 142 blower want to know if it works with Vortec heads. Until now the answer has always been 'no.' Well, now the answer is 'YES!'

http://www.holley.com/HiOctn/ProdLin...lower_kits.htm

With some exhaust-side work on the Vortecs they would probably work real well with a blower like this.

They also have other kits for Vortecs now like the new Vortec HSR intake.

 

bout time

 

I know they were at SEMA, but where are the damn HSR vortec lowers?

 

back from the dead hehe...

anywho the 142 kit for the votec heads ($2130) cost $561 more then the 142 kit for the standered heads($1569)

http://store.summitracing.com/defaul....asp&x=35&y=13

http://store.summitracing.com/defaul....asp&x=35&y=13

i'd go for better heads insted or pay about $400 more and get a vortec sc blowthrough system($2527)

http://store.summitracing.com/defaul....asp&x=35&y=13

(something haywire with my linkage )

 

that is such BS

 

 

lets see (as you mentioned already), do I want to find a set of usable vortecs (around $300) plus parts and modifications for valve spring clearance (about $200 more).

______________
subtotal ~$500

blower $2130
____________
total $2630



or trickflow heads and regular blower:

blower $1,569.00


heads $1,025.95

_______________
total $2594.95

which would you want? aluminum trickflow heads or iron L31's?

I hope one of the magazines lists these two options just to quietly "out" weiand for trying to rape people who already have L31's and want a blower.

if you remember the GM goorwrench quest series these heads and that blower were the most powerful of the series with that $1300 gm goodwrench long block.

 

I have an 84 trans am with a 96 vortec motor with 700miles...

does anyone know what the maxinum boost I can run to run on pumped fuel?

is the following right...

I believe stock these motor have 9.5:1 .. Does someone know if this is true?
6542-1 (142 weiand)

boost/compression
starting at 9.5:1
2psi: 10.5:1
4psi: 11.5:1
6psi:12.5:1

I was going to use an edelbrock AVS 800 instead of a holley 700.. I'm tired of the damn power valves ! anyone think i'm crazy?

current setup:
96 vortec 350
holley 600
t350 w/2k stall
ford 9" 355 posi
street tires (15")

 

old post

 

Pace lists them as 9.4:1 compression

1 point of compression per 2 PSI of boost I am not even sure if this is a correct rule of thumb. Either way it is not static compression, it is only dynamic, meaning it has almost as much to do with your to do with your cam than it does with your boost gauge.

A lot of people feel safe going only 6 PSI on 91 octane, while others go 12, it depends on EVERYTHING from the place you are getting your gas, your altitude, your cam, etc.

a 700 CFM carb is woefully inadequate for a boosted aplication even on a 283, let alone a 350, which would explain your power valves. Also if you tune carbs well power valve eliminators can actually be used in some cases.

 

how you think the supercharger would work with a TBI set-up using this adapter?

 

it would, but will be a tidbit restrictive

 

Not if you 454 TBI it

 

dam this thread has been dead for 3 years , look at dates nextime before u rely

 

Damn that is some bad spelling. Try spell check.

 

lmao my laptop has a few dead keys on the keyboard. makes my post's look like a 5 yo's when i use the laptop without plugging in my usb keyboard

 

Good luck finding injectors for a 454 TBI. CFM Tech is now sold out of the 454 injectors for good and that was the go to source for most people here. Perhaps their machined out 305 TBI with 5.0 or 5.7 injectors and tune could do it if you're not being too harsh on the system.

http://marine-performance-parts.com/...injectors.aspx

But it would be nice to have a mild roots blow TBI setup

 

I see 45, 50, and 60 #/hr injectors here that that are designed to run at higher psi also and flow 20+ #/hr at 21 psi. A small harness adjustment would be needed.
http://www.holley.com/types/Commande...ce%20Parts.asp

 

try southbay for them they might have

 

Stock 5.0L injectors flow 55pph @ 13psi and stock 5.7L flow 61pph @ 13psi as well. If either TBI or TPI injectors are flowing 20pph @ 21psi, there is a massive issue. Fast355 would know the thread, he wrote it. He details every injector used by GM from the 4.3L to 7.4L engines.

https://www.thirdgen.org/forums/tbi/...ification.html

*EDIT*

Holley TBI Injectors will not interchange with the stock TBI injectors.

 

Vortec heads are worth Forced Induction if done right. Tight quench, air velocity, and resistance to detonation are all frineds of boost. I just finally finished my big port vortec FI project. The power curve is absolutel a ball. I have normal to rediculous in every gear.



I also have a TBI 142 though it is the Holley 4bbl. This thing absolutely destroys tires in about every concievable throttle position. Not the easiest to drive but damn impressive.

 

Even assuming that you had enough CFM and were running the 90lb/hr 454 injectors You're still talking about running out of fuel probably. I mean if you average that out over 8 cylinders it comes out to 22.5lb/hr or basically stock L98 injectors power wise. You're really gonna cripple that engine power wise if you run it that much with Vortec heads and any sort of cam. The 4bbl TBI is almost a requirement if not an absolute requirement IMO.

 

There are no 4bbl-TBI systems out there designed to work with boost. You need all the TBI mods & the EBL to do boost on TBI. It can be done with a 2bbl TBI if you know what you're doing. Acceleration Enrichment would be terrible without a proper tune.

 

Did you miss the picture above. That system works awsome. I run 12.0s on street radials.

 

How much boost are you running? No BOV and worm clamps on the connections has me wondering.

 

So if you are talking about the centrifugal above. That has been together for less than 36 hours. The boost is somewhere in the 5lb area for now until i finalize my plumbing, and yes I have a Godspeed BOV that needs to be welded on to my crossover pipe but, I need access to a TIG. Once I finalize the plumbing like the intake side. i will then run up to the CAT dealer and get the right T-calmps.

As for the roots blower, with TBI it has been aroun alomost 6 years now and I really have no need for a BOV or worm clamps on it :-)

 

It just had me wondering because there are t-bolts on the inlet side and worm clamps on the outlet. That setup came out nice other than I hate how the design points the air cleaner right over the exhaust. You think they would have a better system for that.

 

Yea u should see the joke for an air filter they send you. it looks like something off a motorcycle. The way the kit comes they just want you to put that filter on and have it resting right over the number one cylinder primary, cause we all know that is were the good air is :-) I fabricated that silly monstrosity over the valve cover to try and get some better air and some more filter area. Not ideal, but better. The next step would be relocating the battery and trying to figure out a 180 setup to get the airfilter located in the battery box.

I do not plan on leaving the worm clamps but you would be suprised what silicone pipes and a little clamping pressure can hols especially on slick aluminum. Actually have trouble taking that setup apart. But I agree i need something more substantial long term.

 

Your air cleaner setup may not be ideal, but it is far better than what send. I think it looks laid out well.