Well that was not the point of the topic.
no BBC from the factory. I know a guy that has a 454 in his 84. He swapped it in. I think he had to modify the air box, and he used Eibach front springs. not sure what else was involved...66trar said:Probably a stupid question here, but I can't remember if there were any big block G-bodies from the factory. Can a BBC even fit into a G-body or would you have to stick with a Caddy engine to get monster cubes? (I know you can transplant 500Cads into G-bodies, but they're smaller than a BBC in actual physical size). Either way, money spent per horsepower gained, you'd be better off with a 350 or a stroker. Much better power builders.
I was in the same boat at one time! Patrick has some good suggestions. Everything he said will add to your cruck feeling and sounding better. I will hit on the point that is mentioned all over this 12 year+ old thread. The 305 is extremely reliable but also a problem if you really want to have any real fun! My ElCo had the original 305 with the computer controlled carb needing a re-build. I could drop a brick on the gas pedal and jump out and pass it on foot! Drop a 350 horse 350 in and loose the emmission stuff and double the fun. Me, I went a totally opposite direction, you might get it from my user name. Hope you have fun and those boys do too. Welcome to the group, best wishes! And there's a bunch of guys wiling to help whatever way you decide to go!Noob here but I am enjoying this thread, thank you for the conversation. I have a completely stock '87 with 305 and two young sons who need to get greasy on it, and also need to see how their hard work pays off. Would someone please recommend a few simple mods to exhaust or headers or carb to get a little more power and better sound? I saw in more than one place that shorty headers and dual exhaust were basically bolt-on and could work with/around all the emission stuff (which we dont really care about but under the impression that its the least headache to leave in place, please tell me if im wrong), I appreciate any advice you may have.
you totally forgot to mention the cc-size of the chamber. much larger, making for much less compression.Oh, and in addition to this^^^
350 heads do not work on a 305
The 305 uses a tiny 3.736-inch bore and the same 3.48-inch stroke as the 350ci but, the 350 heads bolt on, but the valves will be shrouded by the cylinder.
The 350 has a 4.00" bore
The 305 is a great engine! I'm running a 350 but aint nothing wrong with a 305.I have seen that most of the answers to the questions regarding performance modifications on a 305 is "build a 350 instead". Granted, I will agree that using comparable parts a 350 will always make more power.
All of the modifications that work on any other engine will work on the 305 as it is nothing more than a typical internal combustion engine. It might not make as much power as some other combination, and all engines have some sort of limitation as to what you can achieve. Vortec heads will work on a 305, but in order to get the compression back up, you have to mill them a whole bunch making them essentially useless on anything other than a 305. Not to mention that the chamber "width" is larger than the bore of the 305 creating a "step" in the airflow into the cylinder potentially hurting performance further. Pistons and rings might cost a bit more than a 350, but they are still not anything "Oh my god."
307's may have made more advertised hp, but they were also "gross rated" an not "net" rated like the 305. They (305) typically are not any more or less durable than any other small block Chevy if assembled correctly. Everybody has a "magical combination" for the 350 and claim that it will "beat anything on the road" in some form or another. If it was pure performance that everyone was after, then build a bigger engine. For reasonable street performance, the 305 is not as bad as some may claim. The first engine I ever built was a 305 in a '78 Nova with a four speed. It ran high 13's at just under 100 mph and that was with a peg leg 3.08, and 225/60-14 radials. Trust me the 60' foot time was nothing to be proud of due to a serious lack of traction. (Probably helped that Saginaw live another day)
I'm not trying to say that its the greatest thing since sliced bread, but they're not as bad as poeple think. Especially for street performance.
There are a lot of engines that people still build these days that are not the greatest for peformance yet they are still getting screwed together everyday. (aka 326, 350 Pontiac; 350, 403 Olds; nailhead Buick; flathead and "Y" block Fords, etc)
The biggest thing to remember is that no matter how fast you make it, someone will always be faster. Also, be realistic with your goals. As I mentioned earlier, all engines have limitations, especially when you are on a budget. I'm not trying to bash anyone's ride in any way but for some of the folks that are learning, there are MANY other areas to learn about other than what engine should I build for a bit more power? If a 305 is what you already have, go ahead and tinker, it could be the money that wasn't spent on hunting a 350 core that helped pay for your _. (fill in the blank) Another engine can always be built at a later date as true "gearheads" are never really finished with a project. This is all just my opinion of course, I am sure many other may think differently.
(v8) 305 = 3.736" bore x 3.48" strokeDredging an older thread...
Think about this... Ford builds some pretty crazy 5.0 liter engines. Sorry, but it's true.
305 = 5.0 liters.(or close to it)
You can bolt on a lot of performance parts that will wake these lumps right up.