Has anyone ever built a high performance 300. I have a 92 with a fuel injected 300, I am building a new engine and cant seem to find any high performance parts for it. I found a web site that told me how to swap from the 12 pound injectors to 19 but thats all I could find, could not find a cam or flat top pistons or anything like that.

 

Dont bother

 

I think I will, I never heard of anyone doing this, and I think it would be something neat to try. I think it would be cool to blow the doors off a 5.0

 

Clifford has parts for mainly carb'd 4.9, but really, this engine's forte is its table flat torque curve across the power band which lends itself to longevity and indestructability. Have fun.

 

Well, I commend anyone who wants to do something different.

And before you are discouraged by the surrounding laughter, know that several of the Buick "Grand National" guys have their Grand Nationals down in the low to mid 8 second quarter mile times.

Buick Grand Nationals are turbocharged V6 engines that quite honestly, aren't very special. Sure the crank has rolled fillets for a little extra strength, but the mains aren't massive or anything like that. The blocks have a little more nickel content than the stock V6 blocks, but not by an amazing amount. Just a little.

Heck, I have 380 HP at the flywheel in my FWD Continental which has a 3.8L engine. Dyno'd and measured. Breaks motor mounts and CV joints regularly until I put in solid steel motor mounts. Then I just broke CV joints

But there is nothing with wrong with what you want to do, its just unconventional.

The way to make more power is by putting more air and fuel into the engine. You can do this by making it mechanically bigger, but overboring it, increasing the stroke, etc. Or you can force it in through a supercharger or a turbocharger or two.

Or a combination of all of the above!

But do keep in mind what the engine was designed for, and respect its limits. Materials will always break, its a matter of when. The more you ask the engine to do, the sooner something is going to give.

I built a twin-turbo Buick V6 mostly out of junkyard parts, and at 8000 RPM I produced a hair short of 849HP.

For exactly 29 minutes before it grenaded and made a really huge mess.

You have a lot of research to do, and be careful as you do it. But I see absolutely no problem making more power out of any engine than the factory rated it at.

As a general rule (very general), 1 HP per cubic inch is not unreasonable for an american made engine made of steel or iron. Usually that ratio 1:1 also keeps the vehicle streetable. So with 300 cid, you probably could do 300HP without leaving shards of parts all over the highway.

But then again, I'm a nut, what do I know.

 

http://fordsix.com/

 

keep in mind that w/the same amount ov effort you could make a 302 alot faster. here's an idea. the straight six is a low end torque work horse. try suping it up to make it even more of a puller. it has a lot more potential in the field. see how much low end torque you can get out of it. you can still blow the doors off a 302. when somebody hotshot w/a 302 laughs at your straight six challang him to a pulloff. strap up the trucks and pull him all over the lot. i'll bet you can even drag some 351's around. you can easily supe up a 300 to beat a 302, a stock 302 that it. that really doesn't mean too much. now if the other guy has an equally suped up 302 he'll smoke you.

 

I worked on an older 300 for my brother. I put dual exhaust, aluminum intake, mild performance cam and a 390 cfm holley on a 83 full size bronco. I also milled the head .030 and put in screw in studs so that I could have adjustable valvetrain. It ran alot better but I doubt that it would come close to a 5.0 I think the compression ratio was still too low. I calculated it at just above 8:1. the pistons had a pretty deep dish. I think it will probably take 10:1 comp. and a good cam and other parts to make it run hard. With this kind of compression you will probably need to run higher octane fuel. Clifford has alot of good parts for these

 

Ask this on the inline forum or just read through it and remember their is no replacement for displacement

 

Check out the sticky at the top of the Inline Six forum, also there was a thread a while back in that forum that was really good. The 300s were built for pulling - not racing, but no doubt you can do it. Although a 5.0 would be a lot easier to mod.

 

I'm with all of you, no replacement for displacement, and cost wise, building up a 460 with some turbos is definately more fun and costs less per HP than a 300 with some turbos.

But that doesn't mean its not a cool thing to try, heck, I've done much stranger things in my life

My Sleepernental is a perfect example. As unassuming as a FWD 3.8L powered leather clad Continental is, spanking almost everything light to light is fun. The looks on their faces when they look under the hood is even more fun. Of course, the supercharger is buried at the bottom so you can't really see it without putting the car on a lift. Also, the Electromotive Tech II is well hidden also. You can see it if you're looking for it, but its not really obvious. Its attached to the underside of the airbox

"Yeah, just a little front-wheel-drive V6, nothing special. What year corvette is that?"

Of course I only play light to light. Top end highway play or roads that require handling, well, I'm absolute toast and I just won't play. Which is never a problem because anyone with something fun to play with would never think for a second that my sleepernental has more than 160HP on a good day.

 

I have a friend with an inline 6 in his shop. It displaces 540 CI. The little 300 next to it looks tiny.

 

some even go bigger. i'm assuming its a tractor trailer engine your talking about. those straight six's are huge.

 

BTW, there is at least one person running in the sevens in the quarter with a 300 six

 

it was actually one the ran an air conditioner.