xeroxed

if you go with a 305 tpi get an 85 tpi because they start out with more base hp because that was chevys best motor for camaros in 85. any 305 tpi after 85 were detuned and didnt make as much power in stock form. in 85 the 305 tpi made 215 hp and 275 ft. lbs of torque and 86 it was detuned to 190 hp and 185 ft. lbs. of torque because they introduced the L98 350 that made 220 hp and 320 ft. lbs of torque. if you know chevy they cant have the 305 performing anywhere near as good as a 350. just like they couldnt have the camaro perform better then the vette.

mako350Z28

89-92 the 305 made 230 hp and 300 fp torque. The TPI version, of course.

KamaroL98

I was refering to the 1991/92 Z28s about not haveing Ttops since it was the car he seems intrested in. And autos are good from rolls to.... when they down shift. Eitherway, sticj with going from a stop becaus those turbo supras are killers from rolls.

Makaveli

only the standard trans 305s. the automatic 305s got around 205 hp, and 285 ft pounds of torque. aka the peanut cam

mako350Z28

I stand corrected.

Makaveli

i fell to the same thing. im in the process of buying a 92 z28 with a 305, and i thought by 92 the 305s would all have some decent power, especially the z28s. of course not, the peanut cam remained, kind of dissapointing haha.

mako350Z28

Thankfully, I am one of those people who would never buy a Camaro with anythig smaller than a 350. I made that mistake once and will never do it again.

90rocz

The '89 305, 5spd, dual cat, TPI cars had 235 hp, 300lbft. I think the reason they never put a L98 with a 5spd was they didn't want to compete with their sibling the Corvette, if the Z was its equal they wouldn't have sold many Vettes...
305's can be made perform, but being an unpopular displacement all of the prices will reflect that..
I helped my best friend build his 5.0 b/c he was in the mind set of having an underdog fast car. After spending over 3 grand and and only ending up with a little over roughly 300hp, he said he'd never do it again...('85 IrocZ 305 TPI) Not when he can build 1 and 1/2 times that much power in a 350...The old addage is true..."there's no substitute for cubic inches"...
Of course if you pour enough money into anything you can make it fast, just look at the import econo cars..

Rage

I believe what you were trying to say is "there's no replacement for displacement." And that statement is absolutely correct.

I think that the 5.0's can be built if the right things are done to it. I see people trying to build them, but they never seem to do the right things first Here are my plans for my 5.0:

L98 Heads-$250
LT1 Intake- $150
LT1 Cam - $25
2900 TQ Converter- $600
3.73's- $200
75 shot - $400
Shift Kit - $150
Stage II Chip - $200(i think)

IMO, that right there will be a 12 sec car easy. Anyway, moral of the story, I think that the 5.0 can be built, you just have to do the right things. What do you guys think? Am I shootin for the moon?

90rocz

I said what I meant, I 've heard it both ways, same meaning...

More than the total displacement is the bore to stroke ratio...A large bore short stroke 5.0L would be much easier to make run..
Be careful with 350 heads on the a small bore 305, valve spacing and using larger valves(over 1.94/1.5) will have them rubbing the side of the bore!
Then there's the loss of compression going from 58cc to 64cc heads, you'll need some mill work and thin gaskets..or when you put that bigger cam in you'll have a car that "sounds like a Bat outta ****, and runs like stock.."

My buddy did everthing right, believe me, taking time to measure and match parts perfectly. He used the 305 SR-Torquers, which are excellent heads...it's just hard to overcome the small bore, it also affects valve shrouding hurting flow.
The LT1 cams that make good power in an L98 will be lopey in a 305, a stock emission type one would still be agressive for the 305..
I've seen some hit 12's NA, but many more NOT...given enough money, anything's possible..
12 sec won't be as easy as you think..especially with that combo..the gears, stall, and N2O will do the most for ya, but,,,
Good Luck

kevin 2.8

lets pretend i had a (dreaming) black (mm) 305 tpi 5speed t tops (mm)

and was thinking about a 350 block to buy, now i could probably find a 350 with good compression at the bone yard for 400$ canadian with all the goods on it. could i take one from a tbi truck or somthing similar (and cheap) and bolt up just the block, probably sell everything else on the tbi while im doing it?

just thinking about summer of 2005, the berlinetta gets restored and stored for 2004

90rocz

Yeah, but some of the early TBI heads I believe were 72cc??But my '88 Suburban TBI is 64cc, but with just a little milling you'd be Ok. And even though the TBI truck engines still used flat tappet cams for a while, they have the "bosses" cast into them for the roller lifter retainers. So you could go to a Dealer and get the parts, dril/tap the block, OEM style...

KamaroL98

If i ever bought another 1991/92 Z28, id go with 305 or 350 car as long as it had an Automatic. Becaus the stock motor would be out within weeks and an LS1/turbo350 transmission installe would be in the works soon. That would be the ultimate Z28. A black one.

dj haf

305 auto's are slower than my granny's hover-round wheel chair, lmao

the only fast 305's were the 5 speed 305's... the auto's pretty much suck ***. i take them in my mom's 5 speed corolla lmao

kevin 2.8

i rented an automatic corolla 2003 last monday
it wasnt fast at all

the body shop i take my car to has 2 trans ams, an 87 ta 305 auto and a 89 gta (dunno what engine)
the 87 305 was quick, did kick the back out after 1-2 shift, but it wasnt as fast as i was hoping.

i havent been in the gta yet