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Discussion Starter · #1 ·
looking to find out what i can do to beef it up a bit. 350 with new vortec heads,head's planed,3 angle job done,performer intake,625 holly (single)double be better? cam ? shorty headers,block punched 30 flat top's piston's . any idea of hp ? thinking of running a street scoupe? any ideas thx 81 fire 135000 km nice ride
 

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If you are interested in performance use either Holley 650dp or a 750 vacuume secondary, Carter made 625's. Try a Performer RPM instead. Also if you buy the Vortec heads new out of the box my understanding is they don't need a valve job. Just be careful not to install a cam too large, I think .480 is about the maximum before coil bind.

Steve R.
 

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Yes, He, He!! but it's not cheap.. IMHO try a 496 between the fenders..

A 540 or even a 572 is even better. pdq67
 

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I ran your specs through desktop dyno and assuming that you have 9.5 compression, small tube headers with mufflers, and a Comp 270H Magnum Cam (.470/.470 lift, 224/224 [email protected], 270/270 adv dur) the motor made [email protected] and [email protected]

By bumping the compression up to 10:1, switching to a 650 carb, and a Comp 280H Magnum Cam (.480/.480 lift, 230/230 [email protected], 280/280 adv dur) the motor made [email protected] and [email protected]


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Chris Hill

-79 Malibu (Soon to have a fog fed 454 Big Block)

-Alston Backhalfed 76 Monza
[email protected] w/1.48 60 ft (Motor Only)
[email protected] w/1.40 60 ft (with nitrous, turning it off 3/4 way down the track) Should have high 9s with full nitrous run!
 

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Discussion Starter · #9 ·
Thx's Chris have a few questions for anybody.what would be a good tran for this,running newer t350 thinking of running old style t350 with shift.What would be good rearend gear's to run with this tran. thx's Just an 1981 Firebird
 

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A older th350 would be a great choice. Just have it rebuilt with new clutches, bands, etc. I would recommend rebuilding it with the TCI Pro Super kit. The Pro Super kit only cost about $160 and includes high performance friction & steel clutches, performance bands, adjustable modular, all gaskets, shift kit, hi-volume filter, and the TransScat valve body modification which turn your trans into a manual/automatic setup. A 2500-2800 stall would be great for your application.

As for the rear gear, thats really going to depend on how tall of a tire you plan on running and what you want to do with the car. Do you plan to only drive it on the street? Or will it be more of a street/strip car?

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Chris Hill

-79 Malibu (Soon to have a fog fed 454 Big Block)

-Alston Backhalfed 76 Monza
[email protected] w/1.48 60 ft (Motor Only)
[email protected] w/1.40 60 ft (with nitrous, turning it off 3/4 way down the track) Should have high 9s with full nitrous run!
 

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Discussion Starter · #11 ·
Well i was getting a 2800 stall with tran,stage 2 shift in it (any good).The car will be driven all summer sun day driver. The car came with 2.56 witch are not good for anything but highway.thinking 3.42 or 3.73 will be going in.Do you know what kind of horse you can take these head to,the pistons are 10 to 1 flat tops.Would like to play around on the track this summer.Do you know if a street scoupe would give any or much boots to horse power . thx just a 81 firebird
 

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I have a neighbor with almost the same combo and car. He is running 3.55s with a 26" tall tire and he is very happy with it.

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68 Camaro 355/TH400/3.73
69 Nova 355/TH350/4.88
69 Firebird 400 ragtop
71 Firebird 350
00 Standard Trails 250
 

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A 3.73 would be a good choice for a hot street car.

However, I wouldn't stick much money into the weak 7.5 rear thats hung out back of that 81 Bird because you will probley be replacing it once or twice. With anything over 300hp you will snap that thing like a toothpic. You are pretty much stuck with this rear unless you want to pay the $1000+ price tag for a swap-out 9 inch or 12 bolt for companies like Moser.

What complicates things is the rear torque arm that connects the trans to the rear. These were only used in the 80s F-bodys and the 76-80 Monza which makes it impossible to swap a stronger into these cars using the stock suspension setup.

This was something that I would have had to have dealed with my 76 Monza. However, I decided to elimate the torque arm setup by tubbing the car and running coil-overs and latter bars.

The best thing you could do to make that 7.5 live is to run street tires to limit stress on the weak internals. If you run any type of sticky tire and hook, you will surely brake that thing. Also, if you run it at the track long enough, even on street tires, you will end up braking it.

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Chris Hill

-79 Malibu (Soon to have a fog fed 454 Big Block)

-Alston Backhalfed 76 Monza
[email protected] w/1.48 60 ft (Motor Only)
[email protected] w/1.40 60 ft (with nitrous, turning it off 3/4 way down the track) Should have high 9s with full nitrous run!


[This message has been edited by Chris Hill (edited 12-28-2000).]
 

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Forgot your other guestions...

The vortecs are good for about 350-380hp out of the box.

A street scoupe won't give you any horse power gain unless you are going 200+mph where you can benefit from a ram air affect. It will bring fresh air in from the the outside, but you will look like a poser and get laughed at if your running anything slower than high 10s-very low 11s. A four inch cowl hood would bring fresh air in from the outside and look good on an early 80s bird (in my opinion).

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Chris Hill

-79 Malibu (Soon to have a fog fed 454 Big Block)

-Alston Backhalfed 76 Monza
[email protected] w/1.48 60 ft (Motor Only)
[email protected] w/1.40 60 ft (with nitrous, turning it off 3/4 way down the track) Should have high 9s with full nitrous run!


[This message has been edited by Chris Hill (edited 12-28-2000).]
 

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Discussion Starter · #15 ·
Thx's Chris but the 81' were leaf's,have traction bars just ordered some weld on sub frame connectors .Just finished getting engine compartment cleaned an ready for paint.Was thinking of street scoupe cause price was right ($175.00 candian)with all the gear.Guess i'll sell an put the money some where else.(gears)I can get a 625 Carter fairly cheap.Think that would work all right? THX's Just a 81 firebird
 

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Like others have said, you will get better performance from a Holley 650dp or 750 vac if its within your budget. But if the price on the 625 Carter is really good, get it. You may have to rebuild, but it will work okay with your setup.

Don't waist your time or money with the Performer intake. Its not much better than a stock piece. You will be much happier with the Performer RPM.

Sorry about the torgue arm thing, your right the 81's were leafs.

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Chris Hill

-79 Malibu (Soon to have a fog fed 454 Big Block)

-Alston Backhalfed 76 Monza
[email protected] w/1.48 60 ft (Motor Only)
[email protected] w/1.40 60 ft (with nitrous, turning it off 3/4 way down the track) Should have high 9s with full nitrous run!


[This message has been edited by Chris Hill (edited 12-28-2000).]

[This message has been edited by Chris Hill (edited 12-29-2000).]
 

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hey just wanted to tell you that all 2nd gen camaros and birds had corprate 10 bolt rear ends that have 8.5 inch ring gears ..... i got a 77 cam and i know it has a 8.5 ... the only 2nd gen that didnt have this rear end was the 70 1/2
check out this page http://www.nastyz28.com/camaro/zsusp.html
its a great site for info on 2nd gen cams (birds are mostly the same)
 

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ditto on the rear end caution. I blew a 7.5" 10 bolt with 3.23 ratio right out of an '84 z28 with 355 street engine - (happened 800 miles from home while on vacation of course). The motor was running say 350 horses plus or minus a few. Took 2 1/2 teeth right off the ring gear. Never had a hitch with the T5 tranny oddly enough.
 

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Discussion Starter · #19 ·
Can someone tell the size of gears i need to get (not ratio).10 bolt factory ,when i change,do i have to change axles,can i use the old howsing. THX's Just a firebird
 

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Discussion Starter · #20 ·
Chris could you run your desktop dyno for a another engine for me? 350 0.60,10.1 flat tops,the heads are old fuel injected off a vette,they are 1.94 .torker intake single plane,cam not sure ,it's not vary big an running 625 carter t400 tran,with 3800 stall Going t change that to t350. 3.73 rearend car works real good.My buddy's 79 Z the car is mint.any idea if you need to know anything else just ask.I know he's not getting what he should out of this engine
 
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