tomswenson

i have a 1985 camaro z28. it currently has an edlebrock manifold, hooker headers, msi ignition system, electric fans and waterpump, 3:73 rear, and a stainless steal dual exhaust. got the car for $500. has a lower engine knock, thinking it needs a crank shaft and bearings. so the motor will be coming out of the car. im going to get new shocks/struts and springs, might as well do front suspension while the motors out of the car. so while this motor is out, im also guna mill the heads, do a gasket kit, and basically get this motor running good. so what can i do to this car to give it a little more speed ?

Tuned Performance

iTrader: (92)

As far as the 305 goes the only thing it has going for it besides the headers is the 416 heads. If you do have a rod know it would be more cost effective to go another route. Roller 350 or l31 used or budget depending new build and a roller cam. Another good upgrade for the 85 is upgrading the 870 ECM to a 165.

tomswenson

i want to stay 305 for originality purposes

Tuned Performance

iTrader: (92)

I wouldn't worry about a 305 for originality the car isn't rare but just my opinion.
Having the rods honed or resized, crank ground .030 flat top piston are just not worth the money in a 305. But if your going all out those are decent heads 100 shot, ECM upgrade with a new tune and retrofit roller cam setup.

couchmotors

a hang grenade will make it faster on the way up.HAHAHA. if you want to go fast take out the tired 305 and but in a 383 of a bad *** 350. a 305 is not worth the money for speed

Ozz1967

iTrader: (4)

Guys, come on. The man says he wants a 305.

Well, here ya go. Some samples on a 300hp 305 build. (Crank HP, not rear wheel) http://www.camaros.net/forums/archiv...p/t-15661.html

Summarizes the build anyway. Should get you a starting point.

Street Lethal

iTrader: (16)

What does your 496 big block run...?

couchmotors

it will out run a 305 that's for sure. have not took it to the track yet but went up against a new vette and we door to door until he let off the gas don't know how fast speedo stops at 140 and it was buried hope that answered your question if not its fast enough for what I want.

Street Lethal

iTrader: (16)

Wow, that's damn impressive.

1MeanZ

iTrader: (9)

89-91 Corvette L98 heads on a later 305 with a roller cam. Port work on the Edelbrock lower TPI intake (edelbrock bases flow about the same as stock) get some larger runners and port match the plenum to match.

Mine ran 13.70@100.5mph with a stock 3.23 gear on the stock chip.

couchmotors

that's really good my stock 99 z only pull 108.5 in the quarter before I started putting the goodies in her.

couchmotors

I don't normally street race at all, but this young a-hole kept messing with me so I had to show him and his teenage girlfriend what real horsepower sounded like. if I had one more gear in the transmission maybe I would have left his *** who knows. but I don't like to street race I have seen too many friends and family get hurt or killed because someone pulls out in front of them because they don't know that there coming way faster than the speed limit and bam boom there goes a life and there pride in joy down the tubes or someone in the wrong place at the wrong time. so I like to take it to the track. we had a new one open up here in the Jacksonville fl area. we have been without one for a few yrs because the old one got sold and they turned it into a mall.

1MeanZ

iTrader: (9)

To be clear, thats what my 305 TPI 86 IROC ran with a 214/224 flat tappet cam, vette aluminum heads, edelbrock shorty headers, 3.23 gear and a 5speed. It did not run 13.70 stock, more like 15.20 stock.

It's now a completely different animal, but I wanted to make that clear.

also, 108.5 from a stock LS 4th gen is moving, you got a runner. I've never seen a stock one trap more than 106, but weather conditions play a large part.

bahsarie1

I am with OP I like the originality of the 305. It does not have to be rare. Also I know I don't care about mega upgrades. Sometimes putting on new heads is easier too.

Ozz1967

iTrader: (4)

The 305 can be a fine street motor with some upgrades as shown in the link I posted. However, if you ever have to pull the motor or it needs to be rebuilt, I will advocate going with a 350+ because $$ for $$, you'll spend less for and get more out of a 350.

Street Lethal

iTrader: (16)

Well, in case nobody got the sarcasm up above, I was teasing the big block owner with the thumbsup. Reality is, any engine can be made to run fast, especially with a power adder. My 305 has had a lot of head and intake work done to it, but I set it up with very low compression because I am running a turbo. Even with the low compression though, the 305 makes 300 horsepower on motor, and 450 horsepower at only 7.5-psi of boost pressure...

There is nothing wrong with the 305, it's the cylinder heads that are the issue. But even so, a 1.94" or 2.00" intake valve is more than enough to make excellent power. Most six cylinder engines today from the factory will walk even a decently modded L98, so what does that tell you. It's not the displacement, it's the air flow and RPM band that matters. You want a fast naturally aspirated 305? Build one that can rev high with the right cam, then match it with the right stall speed and rear gears, and you will be very surprised at just how fast they can be...

Mystyk_Wynds

I do have to agree with a few members on here.
Quick and fast are not the same thing:
Fast- top speed determinate by engine rpm, gearing ratios and tire diameter
Quick-acceleration rate
All things equal in a car even a subtle change like tire diameter "will" change both quickness and speed.

As far as the 305...I would do everything to it that is transferable to bigger engines. This way you save money later on, should you go bigger.

This would include
Heads - (valves, rockers, pushrods and lifters)
Camshafts-fairly universal
Crankshaft- Balances are different, be aware of this.
Rods
Exhaust-most benefit rather well from proper systems...However this is a tricky dick. (Many and major factors that can significantly alter outcomes)
Intakes- engine sizes all reacte differently, so this is another tricky dick to play with. (Many and major factors that can significantly alter outcomes)

So pick and choose wisely the parts combination you want, based on your application, and lotsa research....Before you begin. The sum of all your parts, is as equally important as the effects of each individual component, and its integration with the rest of the system.

Easiest, best bang for your buck quickest add-ons...Headers/exhaust, roller rockers, cold air intake, and air foil booster.

Ozz1967

iTrader: (4)

That sounds an awful lot like what Chevy did to the 302 back in the Late 60's.

Make the 305 a high-revving machine, give her some good heads, and she'll be a stout little motor for you.

redneckjoe

just from experience, years ago i blew the motor in the wifes monte carlo. so i ordered a rotating assembly. long story short, it was a stupid idea. why? because for the same money, i coulda built a nice 350/383. i never once thought, "gee, im glad i only built a 305! "

nobodys ever gonna care about a numbers matching 305. JMO.

but 305 owners always get mad about getting a 350, etc comments.

the guys with experience will tell you to dump the 305 and put your money elsewhere.

Street Lethal

iTrader: (16)

In the 305's defense RedNeckJoe, the amount of money I will save in gas in relation with injector duty cycle in the long run is money put in my pocket, and when I want to run fast, it's only the matter of turning the boost up. With a large displacement engine, you sacrifice gas mileage in comparison, and in today's day and age, I'm looking to drive my car as much as I can wherever I can, not just stare at it from the distance, or get the urge to drive it after watching a Street Outlaw episode. It's the best of both worlds. Big cube guys feel the 305 is too small, to the Turbo V6 guys 305 cubic inches is a wet dream. Even with a 23x/23x cam in my 305, the gas mileage will honestly surprise you, and the power at 20-psi will absolutely floor you, so one should never knock it until they try it...

1MeanZ

iTrader: (9)

Gotta be careful here. The small 3.73" bore of the 305 tends to shroud the intake and exhaust valves. Getting one to breathe well at high rpm without boost can be a challenge.

Not knocking the 305. I've built 2 of them on purpose and loved them both. Just gotta be aware of the boundaries your dealing with before you set your expectations.

Street Lethal

iTrader: (16)

Nah, mine's been built for a long time already, I just don't have any recent vids to embellish what it runs, just 1/8th and 1/4 mile data from the EBL-P4 as well as datalogs which gives me my horsepower numbers. Heads are ported to the max, TPI is ported to the max as well as siamesed, and the comp cam I selected is huge for a 305, but compliments the rest of the setup very well. She will rev over 6000-RPM no problem, but under boost the valve springs are fighting me, and those get upgraded as soon as the weather gets better. This was right after I installed the first turbo, a T72. Now she is running a T88...



This is the last video I shot of her last year, all dialed in. One thing to note is that I was still running the stock runners and throttle body, and she still revs over 6000-RPM, no problem. High idle due to cold start...

1MeanZ

iTrader: (9)

Lethal, my comments weren't directed at you. But I will add in response to your post that I don't consider 6k high rpm. When I think of high revving small block I'm thinking 7500rpm or more. We are in agreement, with a good top end a 305 would have no issue with 6k. I shifted the aluminum headed 305 I mentioned above at 5500.