Dont take my word for it... I'm new at this! lol

I got the idea to check the back of the block from here...

http://www.popularhotrodding.com/eng...cks/index.html

Mainly from the pics in the middle of the page. If thats wrong I sure hope someone corrects me cause I'd like to know.

 

Forget the pics! That's a really good article! 370 HP from a stock bore and stroke 305, with just a change in heads, cam, intake and carb. Pretty impressive, and sure would be fun to beat some 350 and then tell them it's a 305 engine!

 

Looks like that wire goes inbetween the spark plugs 1 and 3 i believe, atleast on my engine thats where it goes.

 

Definitely a good article,plus some good tips.My car has a 305 right now,i was planning on replacing it,but may have to follow this and build it up a little and save some money over replacing it.

 

Meh,still rather start with a 350 and they're still a dime a dozen.
That 305 build is a lot like the old '67-'69 302 Z28 engine,they made good power for their size but if you ever drove one vs a say a 1970 LT1 350 which I have there's no comparison.
The 302 made all it's power high up in the rpms,it couldn't get out of it's own way below 5500rpm and didn't really come on the pipe till about 6000.
On the other hand the LT1 had gobs of torque right off idle and power just kept building as you gained rpms all the way to redline.
The only reason GM even built the 302 was the SCCA regs for transam racing had a 305 cid limit,GM just destroked the 350 to pass regs.

 

I understand the 305 vs 350 argument, I really do, but if you already have a 305 and have no plans on racing it, I see no reason not to go ahead and build it.

Not everyone wants a race car. Having a 600hp, fast as hell, doughnut burning, wheelie poppin car just to go 30mph in town on the weekends (burning $100 in gas a night) seems a tad overkill to me. If you want that, thats fine, but some of us just want a nice classic car to ride around in... and the 305 plant gets the job done nicely.

Just my 2 cents.

 

The 302 was not a destroked 350, it was the same bore as the 327, with a 283 throw. Old rodders built many a 302 from doing this same swap long before Chevy did the 302 themselves. Had just this setup in my 1955 Chev 2dr sedan, and it would pull the front wheels when I launched.
As for power in the 302 Z/28 vs. the 350 Z/28, I'd sure disagree with your remarks. Back in 1969 my best friend bought a new yellow Z/28 with 302, and it was no slouch from right off idle to the extremely high red line. One of the fastest production cars I had ever ridden in!
In 1970 he traded it in on an identical Z/28 with 350, in the same canary yellow with black top. That car was faster, but I drove the '69 down to pick up the new car and we did a little 1/8 mile race on the back street to see the difference. The 1970 won, but by maybe half a front fender. In the 1/4 mile I think it would have opened up the lead to maybe a car length, but no more. That little 302 was flat fast, even giving away 48 cubic inches.

 

Nut'n wrong with that I guess,in that case I'd just leave it stock.
That said if you spent the money doing all the mods done in this "budget" 305 build for more power I think you'd be money ahead to just toss in a garden variety 350 crate replacement engine.
A new std 350 can be had for less money than a performance top end kit,good street friendly bottom end torque,a new motor with a warranty and easy to get more power out of later if you want it.
Just my 2 cts.

"New" 350,less than $1600.... http://www.summitracing.com/parts/NAL-10067353/

 

Yeah, morethanjustpower.com used to have that same engine for right at 1400 bucks and I could drive and pick it up at the dealership. Apparently they've risen the price to the same as summit.

 

Just for fun, here's the specs on the 1969 Z/28 and the 1970 Z/28. As you can see the 1970 350 is about 3/4 sec. faster in the 1/4 mile, and has about 90 ft. lbs. more torque at around 4000 rpm's.
Of course we already know the 302 was cleverly underrated by Chevrolet from it's true HP of nearly 400hp to the 290hp rating.
What's interesting to me is the 0-60mph times. The 1970 350 is 1.3 sec. faster in the short run to 60mph!

The 1969 Chevrolet Camaro Z28
Specifications
Wheelbase, inches: 108.1
Weight, lbs: 3,765
Number built: 20,302
Base price: $3,185

Top Available Engine
Type: ohv V-8
Displacement, cid: 302
Fuel system: 2 x 4 bbl.
Compression ratio: 11.0:1
Horsepower @ rpm: 290 @ 5800
Torque @ rpm: 290 @ 4200

Representative Performance
0-60 mph, sec: 7.4
1/4 mile, sec @ mph: 15.12 @ 94.8



The 1970 Chevrolet Camaro Z28
Specifications
Wheelbase, inches: 108.1
Weight, lbs: 3,850
Number built: 8,733
Base price: $3,412

Top Available Engine
Type: ohv V-8
Displacement, cid: 350
Fuel system: 1 x 4bbl.
Compression ratio: 11.0:1
Horsepower @ rpm: 360 @ 6000
Torque @ rpm: 380 @ 4000

Representative Performance
0-60 mph, sec: 6.1
1/4 mile, sec. @ mph: 14.4 @ 99.1