Both are good motors; depending on who you talk to as to how good. Generally speaking I have had little problem with either; they are both decent small blocks and fit the same in the hole. Lots of parts between the two are interchangeable too. Intake, heads, exhaust, carb, so that right there might help. If you dont like one motor, or you blow it up, you can swap right over to the other with very little changes.Just purchased a 90 YJ that was in the beginning stages of the v8 conversion, I have a 305 & 350 engine just wondering which motor is a better swap in the long run and what kind of milage i can expect when I'm done?
Yeah, early to late 70's motors were rated at the 8.5:1, but like you said once built you can really wake them up.That helps for sure. The pistons in the older 350's were a big issue too. A lot of those motors had "8.5:1" compression but they actually ran closer to 7.6:1.
Well, in reality, any new heads except for the stock ones.
I have a site for codes...Dirttracker18 said:Agreed :thumb:
but vortec heads are cheap and plentiful. Pull a set of junk yard heads and run them. Yes you can get better with aftermarket but not this cheap. Good bang for the buck.
As for stock, there are lots of good stock GM heads out there, though few from the mid-late seventies, or early eighties for that matter. Unfortunately there is a lot of myth and misinformation out there regarding the SBC. Some heads out of the 70s are great with a little port work work. The smaller combustion cambers help to boost the compression a little to sqeeze a few more ponies out, but they usually suffer from lesser valves.
As for the OP, would you keep these engines stock? Do you know what year they are from? If not post up the codes off the block and we can decipher them for you, assuming I can find my book You always have the option of dropping it in stock form and making some HP changes as funds permit.
Ultimately, if you have both a 305 and 350 handy, the 350 wins hands down in all categories.
4bolt is heavy duty, towing and dragging and the like; but honestly a two bolt is more than adequate for most applications.I would go with the 350, you can go stock now. and do more down the road cam's. heads etc. I would just make sure the one you go with is a 4 bolt main alot tougher and can handle any more power you want to add to it.
Again agreed,4bolt is heavy duty, towing and dragging and the like; but honestly a two bolt is more than adequate for most applications.
For DD or generic 4X, I would not go out of my way to find a 4bolt.
Guess what kind of site it is.
Yup... same here.Been there
I don't have one now but I had a 1980 Z back in the day. I would love to find another one with T tops and a 4 speed to make a modern day muscle car from. I have so many ideas and so little money.
I show you a pick of the old girl but my post count is too low.