hey guys i am new here . looking for ideas on 305 builds around the net but all i see is alot of neg.responses . i was looking here and see that theres alot of you that build them .
so just looking to see what you did with yours and what parts you used .
i seen one that was purple with a tunel ram ones in a pic from here but dont know who it belongs too . would sure like to know mure about that build !

 

Welcome aboard thirdgen.org.

There is a thread on the FAQ forum called differences between 305's and performance upgrades. That pretty much details what needs to be done and what is worthless based on what else you've done.

Most of the people who have built fast 305's (including one whose username was to that effect) have moved on to bigger and/or different engines. It's not that you can't make 305's run better (my comment after having my upgraded 305 out for the first time was, "Now this is how the factory should have built 305's!"), it's just that the HP/$'s isn't all that good after a certain point. Yes, you can make a 305 faster for say $1000 than you could spending $1000 putting a 350 in, but once you get to the point that the 305 shortblock needs to be upgraded (forged pistons, H-beam rods, forged crank, etc.), you might as well be spending those $'s on a 350.

 

yeah great tread . i was just looking to see what other guys where building and the power they where making . because i am in the midle of building my motor but trying to keep a good budget .and trying to make the most power .

 

A tunnel ram on a 305 is pretty much guaranteed to be pearls on a swine.

A nice running 305 would have an upgrade cam, something like a Comp XE268, some work done on the heads (valve springs at least, bowl clean-up helps a lot, as does 1.94" intake valves), and upgrade intake manifold like an Edelbrock Performer or Performer RPM, a better air cleaner housing, and complete exhaust upgrade from the exhaust ports at the heads to the rear bumper.

Higher stall converter (if automatic transmission) and gears make an amazing difference.

 

i have a pic of the motor i am talking about maybe you would reconize it ?

 

"302 Horsepower"? Child's play. That tunnel ram is 100% bling.

The combo I suggested would put out at least that much power, would drive much better, and wouldn't require a hole in the hood or create a blind spot. With a stock CC q-jet, no less.

 

i built a 305 years ago and it was kinda worth it, to me at least.

heres most of my parts list(what i can remember)

holley 650 dp
team g intake (3/4 riser built in)
2" open spacer (so needed)
dart iron eagle heads (215 cc 2.055 I /1.6 E, 64cc chambers angled plugs)
crane saturday night special cam (solid flat tappet, .518I/.536E 244/252 @.050 106)
.1xx dome piston K/B .060 over (11:1 W/.019 steel shim gasket)
stock rods( factory x rod, only came in 305 H.O. i believe)
stock crank, chamfered and cut .010/.010 (all balanced)

this motor was as fun as they came, didnt make any power(less then 200hp) till around 3800+, and i was short shifting @7500(didnt trust rods).
was told it dyno'd 467hp@6800 and 410lbs@4100 (how acurate that is, i dont know). the best part was not lie'n to people after the race and see'n thier face when i told them they were just beat by a 305. other then the novelty of it, i would prob. not put the same amount of money in 1 again when a 350 would cost the same, but in same respect, why would anyone ever build a 350 when you can do a 383 or even a 391 for the same price... so built what ya have, or what ya want, its your motor after all, dont let any neg. opinions deter ya, most of them would prob. have been beat by that old 305

 

I'm in the same boat as you. I'd like to keep the stock engine in the car, but make it perform. Sounds like it's not that hard to make 'em quick lil motors.

 

well heres what i got so far i have a 305 with a .030 overbore speedpro pistons hypertek. with all the rest of the bottom end .
i have a performer air-gap intake, and a set of 416 heads ,shorty headers
nitrous plate (that i may think of using )distributor and msd ignition
so i guess i am still on the fence about what cam to use and if i should get any head work done. besides valve springs and screw in studs .
because i am on a buget but its all about gain/price really .
and i am thinking of using a older Q-jet that way i can get performance and still knock off some mpg

 

I like 416 heads they flow well with work, a 470-480 cam would make that a good running little engine. Quadrajets are great if they are good and awful if their not.

 

i forget the specs, and crane isnt doing to much anymore, but i used a crane compu-cam 2030 in a 305 with a rpm manifold(non air gap), holly 600, headers, msd 6al, some underdrive pulleys. it had a nice lil lobe to it and moved pretty well in a G body with 2.73 gears,( think it went 14.0 in the 1/4). but as far as bang for the buck, if you have the time, spend 40 bucks on a port & polish kit. just clean up the heads, dont need to go hog wild.

 

Don't. Nitrous and hypereutectic pistons don't play well together (unless you keep the shot really, really small).

 

100 shot should be all right . as i had a 75 shot on my 3400 V6 with hipertek pistons and had no problems .

 

How did you get those valve sizes to work on a 305 especially at those lift levels?

 

the block was bored .060 over, and the pistons had reliefs, we used a machinist ruler and had about .200( keep in mind the .026 lash hot) before piston to valve contact. i have no clue what the valve to bore clearance was.. had to be close though, maybe .100 or so

 

I have them but haven't used them yet...............

You could try to find some 305 Vortec heads. They came on trucks for only one or two years. I picked up a decent pair for $100 a while back. I laid them on my workbench right beside a regular 350 Vortec head and they look almost identical, except for the smaller combustion chamber (58cc vs. 64cc) and a slight bump in the intake valve guide area.

 

Did anybody notice the 062's have had holes drilled and tapped for a regular intake manifold?

 

That wasn't done by the factory.

 

Correct. I think they guy I got them from had bought them new from a shop that modified brand new Vortecs and then resold them.
I've also done a set myself by mocking up a block with Vortec heads on it and sitting an old stock manifold down on it that I had cut the entire center out of around the carb base, carefully using feeler guages on the china walls to get it nice and level and using transfer punches to mark the intake bolt hole location. I then took it to a machine shop and had them drill and tap the holes for 3/8" fine thread bolts. I wanted everything to be done nice and straight, but I probably could have done it myself just fine.

It works really well. The intake gasket wall of the heads is a little thin so you can't gorilla down on the bolts too hard. And the regular manifold, I used an Edelbrock Air Gap, actually fits up to the ports very nicely. You can look down through the runners and see some of the ports on the heads. Sometimes there is a very slight difference in the height of the manifold runner roof and the roof of the Vortec intake port, but it wasn't too big of a deal and the difference is in the right direction, IE: the top of the manifold runner can be a little lower than the intake port and it will not cause a ledge for the airflow to hit due to the direction the intake charge is moving. You could grind the manifold to make it perfect but I didn't bother it was so close to right.

I've got it in a daily driver '77 Nova with a mild 6" rod 355 using an Edelbrock Q-Jet and it runs real nice for a DD/street toy.

 

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

 

That right there is a great article.