I might be crazy

[CamaroAdam73]

But i'm going to build up a 305, with a nice price tag.

I picked up a fully assembled, and running 305 for 50$, i didn't think it was much of a find untill i ran numbers.

The heads are the 14014416 cast heads, which have some potential. And pretty much they are the entire reason for this build, that and my bottom end is punched .30 over and stroked (340 displacement overall) .

With some minor work it could be a nice semi fuel effective motor, and still have some punch to it.

I was thinking having the heads fitted with bigger valves on the intake, (1.84 to 1.94) and just leaving the exhaust valves alone. Gasket match it to free up some flow, and depending on how much the shop charges, maybe some port/ bowl work.

Piston are going to remain the same in the motor, most of the bottom end will stay the same, a set of fresh bearings is about it. And a check over of the bottom end. Not that much can go wrong on this, its a well built bottom end and its low-revving.

The cam is a comp cams extreme energy, matching kit. Lift is .454 on each side. I forgot the duration i'll have to get the cam card out of my garage and look. I have a nice lunati cam to use but it would be a waste in this motor, it doesn't even make power till 3500 RPM, which would leave me a 2000RPM range for power, but this comp cams starts at 1700RPM, and makes decent power all the way up to 7700 RPM, which this motor will obviously never even come close too.

I've got a nice intake to use, holley aluminium, not sure of the model but it's not an emissions restricted intake, and it's got a divided plenum.

Carb is a slight issue, i do have a nice double pump mechanical secondary, but its a 780. Might be alittle to big for this motor? For a standard 305 i thin i'd be dumping to much, but it has been stroked so that helps.

As for the rest, i have headers to use but I'm considering exhaust manifold still. Depends on if i can get a good pair that won't bit my power compared to the headers i have.

And the ignition is simple, just a good old mallory super 85 series HEI, nothing too special but it'll more than do the job.

All said and done, it should run 250-300 HP and be a nice daily drive with some hot rod to it.

 

[khan0165]

normally, I would poop on the idea,
but it seems like you know what you're doing. And the motor only cost you $50 so far.

... hesitantly, I'd say go for it.

- how do you plan to stroke it? (besides gently caressing the engine with your hands). I don't know much about 305 performance builds. Can you just use a stock 350 crank? Aren't the journal sizes different?

- as for the carb, why not pick up a used Q-jet? Off a 350 or 305H/O motor? It'll give you amazing fuel economy, and good punch. And it'll be much easier to live with on a day-to-day basis than a Holley DP.

- are you planning to run the stock stall convertor on the transmission? Might want to step up to a 1200 or 1300 stall.

... and sorry to poop on HP numbers, but I think it'd be closer to 250-270hp. Unless you really bump up some compression and flow numbers, run a MSD ignition setup, and maybe 104octane fuel. But I think you'll still pull off some decent 300-320ft-lb torque numbers.

 

[CamaroAdam73]

Well, the motors already been stroked and bored .030 over. So I'm not spending any money there, all of the parts I'm using i already have, except the manifolds, like i said if i can find a pair that offers close to same flow as the headers then I'll pick them up and get them powder-coated black and cleaned up.

About the 350 crank, i'm pretty sure if you put a 350 crank in a 305 you end up with a 305? this was a topic in another post of mine, because i was confused about a 305 being the same bore as a 350, just different stroke, and that was NOT the case, almost the exact opposite. I think the only difference in 305/350 cranks are casting numbers and they way they are balanced? and depend on the year wouldn't the rear main seal be different in the blocks?




Your right about the Q-jet carbs, but i don't have one. I do have the holley 780 ready to go, so thats why I'm using it.

Already got an above standard stall TC, 1200.

Yeah i figured as much, the motor is a 9.1 now, other than some head-gasket work, the compression is staying the same, because i'm not doing any thing further to this bottom end.

I've been doing ALLOT of reading about the 305's, mostly on hotrodders.com.

This thread is pretty useful, there's allot of information. http://www.hotrodders.com/forum/stroked ... 698-3.html

The overall goal of this build, is just making the best out of what I've got. Even if the motor pulled less than 250HP, tha'ts fine by me. I will be documenting everything about this build up, and I'll have dyno paper work to prove whatever the motor puts out.

After I'm done using it as a daily, because I'm building a nice 350 on the side, I'll end up selling it on here, considering a 305 came stock in most of our cars, I'm sure someone will be interested in a 305 with some punch and little bite on the fuel. 😀

 

[383Camino]

Where did you get (and why do you have) a 1200rpm converter? Isn't that stock?

For $90 you can get an 1800-2200 converter (assuming a TH350) from Summit. I ran one of these behind my 383 until I saw the light that I needed more stall speed. You don't wanna be that guy that has to pull the car out of gear when idling casue the converter is too tight.

Otherwise, I like the build idea!

 

[monte olrac]

personally you should mill down some different head, while 416 are far better than your average 305 heads, they will leave you lacking power after 4800 rpm, so spinning that motor up to 7700 will just be to impress the tach watchers, I think you should get some vortec heads, they are cheap and flow so much better than 416 castings and you probally can get the cheaper than the oversize vale job will cost you. just food for thought

 

[86Cutlass383SR]

305's are good little motors. God, how many has Chevy even made, millions and millions of them. And then to stumble on a stroker 305 for $50. !!! I'd agree, normally I'd say pass on it but as long as you know ahead of time (and it sounds like you do) that's it's never gonna be a big torque engine but it's gonna be a great little street driver engine.

Go for it.

Remember, when most cam companies advertise a power range for their cam, it's based on a 350. So, a cam for a 350 with 2000 - 6000 rpm range will have a higher rpm range in a 305. How much, I don't really know. I'd guess at least 500 rpm higher.

Sounds like a nice little engine. Enjoy it.

 

[JBreu]

Go for it..................Hell back in the day when I had a 305 cid my '79 Monte ( B4 the 355) I made it badass with a crane cam fireball 2, 4 barrell carb and headers with an intake...............was better then the stock 350's out there at the time...Man that was a looong time ago.

 

[RITTER]

I have always wanted to stroke a 305. You do it the same way you stroke a 350, you just have a smaller cylinder bore size. I have read many articles about the 305 stroker and some respectable numbers come from these engines. They are typically low RPM engines.
Good luck with the engine

 

[CamaroAdam73]

I'll definitely keep everyone updated on this build, pat i never plan on letting or even trying to push this motor to 7000 RPM, that would be death internally, hell even 6200RPM is pushing it.I know its a low reving motor, and that's where I'm trying to make the most power. As for the 416 cast cylinder heads, the main point of building this motor is working with what I've got and budget cutting, if i can make this stroked 305 put some decent numbers to the wheels, then that means we all can! and considering almost ALL of our cars came with a 305, that's good news for us?

JBreu, I'm not 100% sure on my stall speed, i know its a standard TC for a 700R4, that's what the trans shop told me. But a 700R4 was used in a WIDE variety of applications, so my stall speed right now is kind've a mystery. Haven't drive the car in awhile either so i can't remember when it kicks in.


86Cutlass383SR, thanks for the info. that's a HUGE help, i didn't know that and I'll be making a call to comp cams and seeing whats up with the current cam i have, if all else fails I'll just have them help me pick a nice cost effective cam for this application. And I'll post up a copy of the cam card.

**edit** this is something that just came to mind, for a low revving motor making all its power in and 5200 RPM range, would i be able to make better power with a mechanical flat tap VS the hydraulic flat tap style cam the 305s came with? Because i have a cam from a 1967 L79 ( or L78 i forgot the code) 327, and the motor it came from was rated at 350HP at 5200, that's pretty decent, i know the 305 wouldn't come close to that, but I'm still wondering what the pros and cons are here.

 

[86Cutlass383SR]

You could always play around with the Comp Cams Camquest. It is free and gives cam recommendations so you can swap parts and see how they affect your engine. I don't know how accurate it is but it's fun to mess around with.

http://www.compcams.com/CAMQUEST/