307 engine

[dan2286]

Here is one from the engine masters challenge, http://popularhotrodding.automotive.com ... tions.html

http://blogs.popularhotrodding.com/6304 ... index.html

I think there is more out there, but I cant find them. I think the most expensive part on the 307 in the links above is the cylinder heads, unless you know what you are doing and can do the work your self. I believe the labor on those heads would run around 4 or 5 grand. I am pretty sure they are the 5a heads off the 307.

 

[broke1]

plus i want to be diffrent, you don't see alot of high hp olds 307s , because everybody don't want the headache or spend the money and have a hard time finding parts for the 307. some people just want to take the easy way which is fine for them but i need the chanllenge. 95% of all these cutlass out there have a 350,403 or a 455 and i don't want to be like everyone else. what about the olds 330 or 425 i haven't seen one cutlass that ran these engine and they are good engiens. i just think those people are afraid to take something that was ok for the time the engine was made and the make it better using todays technology. if there is anyone who agrees with me good if not thats fine to. but if everybody wanted the same type of car olds would of made one engine for the car thats it :evil:

Put a GN engine in it....

Putting in a 307,no matter the HP and mods,will not add value to the car.

With a turbo v6, your car will actually have better resale and be ALOT rarer than a built 307.Youll also get better gas mileage and ALOT more power than ANY 307 will ever make,ever.

Ive only seen 2 Cutlass' with GN engines.One car was a 84 rust bucket with a stock 200k mile GN engine and sold for $6500.The other was a show car and sold for over $20,000.These were regular old Cutlass', not even 442's or Hurst car's.

Anyone else ever seen a regular 84-87 Cutlass bring close to $20,000?

 

[Brick442]

If you are going to rebuild the 307, make sure you are using a 5A head 307. You can't go too radicial with a cam on 7A's, It won't make much of a difference because of the tiny ports.

Also, I'd recommend upgrading the valve-train, especially those stock rockers which I have had problems with when going with even a mild cam and matching springs.

Keep in mind that to get the most out of a 307, once you start making mods (increased compression ratio, bigger cam) you will need to ditch the computer controlled distributor. I've seen people add larger cams and headers to 307's and wonder why it's slower than before, well the computer can't handle it.

Get that compression ratio to about 9.5:1 and have those 5A heads ported.

I haven't rebuilt a 307 in years, but I saved my original code 9 307 with 5A just in case one day I'm in the mood to do something crazy.

Like the other posters said, it just takes $$$ to do it right, I've seen a lot of bad machine work done on Olds engines.

A built 307 also likes lower gears in the rear . . . I'd go with 3.73's to wake it up.

 

[craig manthie]

i already 3.8 v6 to make the gn moter which i like to get rid when i pull and i don't really belivin in turbo or nitrous or any other mods like that i want all moter that it's. and i have no plans to resell the car ever so i'm not worried about increasing the value of the car.

 

[82355supreme]

i already 3.8 v6 to make the gn moter which i like to get rid when i pull and i don't really belivin in turbo or nitrous or any other mods like that i want all moter that it's. and i have no plans to resell the car ever so i'm not worried about increasing the value of the car.

That's great & all to not want any "horsepower cheater" and go the N/A route. You build your 307 and come take a whack at my black Buick in my sig with the cheater 3.8 and see what happens. Just prodding 'ya, don't take it personal.

Seriously though, your current 3.8 is NOT the same as the turbo 3.8 You can't just bolt on a charger and think you have the same engine. The only thing they share is the block. And then actually the turbo blocks are a "109" casting #.

The internals are not even close to the same. Your crank, rods, & pistons would be seeing daylight fast at the slightest hint of boost pressure.

I understand the unique route you want to take, but by the time you sink coin into the dead-horse 307 and MAYBE make 275-300 horse, you could have buit a 350 or 403 and have 375-400 horse. Your call...........

 

[craig manthie]

ok maybe it's not the same buick 3.8 but it still doesn't matter if i had a buick gn i would still pull the engine and put in a v8. and do no this ro a fact about the 307 hp i could get or is this somethig you have heard. because i know people that built high hp 307's. turbo , nitrous and supercharging is not real horse power your still relying on something else for the power the engine that you built can't produce.

 

[82355supreme]

If you want big N/A power you better get the basics of engines understood 1st.

1st basic lesson...... big displacement=big power. Yes I'm slamming the 307, and not because it's an Olds engine. I don't give two $hits the brand, cubic inches equal power when it comes to N/A. This isn't something I was told by someone else, this is a common knowledge fact.

You just plain are NOT going to get huge RELIABLE power from a 307. Sure you can sink thousands of dollars into a 13:1 CR, 220 cc runner headed, .650 lift 300* duration cam, 8,000 RPM peak power making 307.

Now try to run this peaky, stumbling mess on the street. Isn't going to happen.

Even at this kind of radical specs you won't be making any better power than if you'd take a bigger cube engine with a reliable 9.5:1,180cc heads, .500 lift cam, RPM intake, and a 650 CFM carb. This combo on a 350-403 CI engine will make 375-400+ Horse & 425-450+ lb ft of torque. All the while being totally streetable and more so, dead nuts reliable.

What's your version of a high horsepower 307? Please answer this.

Pulling the 3.8 outa an 86-87 GN in favor of a V8..... now that's about the stupidest thing I've ever heard.

 

[413Cutlass]

ok maybe it's not the same buick 3.8 but it still doesn't matter if i had a buick gn i would still pull the engine and put in a v8. and do no this ro a fact about the 307 hp i could get or is this somethig you have heard. because i know people that built high hp 307's. turbo , nitrous and supercharging is not real horse power your still relying on something else for the power the engine that you built can't produce.

Turbo's and superchargers rely on the engine to make the power that they do. Personally I would love to see an S/C series 3 3.8 in a rwd cutlass, hell I may even do it myself. Easy to mod, reliable, cheap parts, and it would fit very easily. And trying to use the 307 as a performance platform is piss poor.

 

[craig manthie]

why is it piss poor to use a 307 as perfomance engine, it can be done if you want to spend the time and money ooh and have the no how which some people don't. so i don't think it's piss poor. that you would use a mod! is piss poor no matter what it is

 

[82355supreme]

why is it piss poor to use a 307 as perfomance engine, it can be done if you want to spend the time and money ooh and have the no how which some people don't. so i don't think it's piss poor. that you would use a mod! is piss poor no matter what it is

Do whatever you want. But when you're still getting your a$$ kicked by bone stock 5.0 Mustangs and running a 15.01 1/4 miles don't come back crying on these forums.

By the way, you never did answer my question as to what you think a powerful 307 is and what your build combo will be. You just don't seem to understand basic engine principles.

I smell a troll....... anyone else??

P.S. if you're legit, you build your 307 and I'll come mop you up with my Cutlass. The only power adder it has is my right foot.