Talkin carb to oil pan, manifold to manifold, fan to flexplate. I'm curious. I've always seen and heard ready to run SBBs were under 500lbs, but then I hear some people have said 475, 550, etc. Anyone ever do it? I have my 76 sitting in the garage, but no means of measuring it. Any input is appreciated.
I do know the 340 block is 82lbs heavier than a 215. That's not a lot. 142# and 60# for the crank. The heads aren't as heavy as you'd expect either. The iron intake? Yeah, that's just as heavy as you think it is. But you put aluminum heads and intake on it and you're in the neighborhood of 400# without exhaust and flywheel. Type of starter and alternator makes a difference, aluminum or iron water pump, etc. We pay a lot of attention to this stuff over on BritishV8. The SBB is within about 2lbs of a SBF. Jim
450 is a myth. This guy is at 541 with no fluids. http://forums.off-road.com/jeepster...86-buick-350-weight.html#/topics/72486?page=1
I doubt the 350 weighs any more than the 340. I was going to say 400 with no flywheel, fan, alternator or starter, aluminum heads and intake. Block and crank : 202lbs Heads? I think about 30lbs each Intake? About 15 maybe Timing cover and water pump? Maybe 20 Pan? 5 Rods and pistons, about 25lbs timing set less than 10 Damper 15 maybe Assorted hardware 20 gets us up to 372 lbs What did I miss? 20 lbs of rocker shafts. Couple pounds of pushrods. Cam and lifters. Yep, seems to come out pretty close. I'm sure my numbers were off a little. Jim
Just checked out that site. the dang Mopar slant 6 weighs more than a Buick 350 lol Chevy small block 575 Buick 450 Mopar S/6 475 Take that 40 lbs off the front of the motor with a TA intake and put the Alum heads on...Where we at now 390 ha
Can't verify the 450lbs, but can confidently say, having had both a 70 Buick 350 and 69 Chevy 350, the Chevy 350 long block is definitely heavier. Fully assembled I would imagine numbers can vary greatly depending on bolt-ons and accessories. Now I wish I weighed mine
Sometime in the next few months I'll have a complete 300 here. Once I get it I'll put it on the grain scale. I know from past weighing of components that the 340 block is 2 lbs heavier than the 300 block and the cranks weigh the same. Not going to be much difference in the weights of the complete engines. "As the bare block ages they get heavier" Mark, that explains a lot. I've been looking for a good reason why I keep putting on weight. Jim
I weighed a 340/4bbl from a '67 LeSabre before I installed it into a '70 Jeep CJ back in 1986. It weighed 505 lbs including carb and exhaust manifolds but no accessories such as alternator or PS pump. The only thing I didn't write down was whether it had either the auto flexplate it came with or the stick flywheel. I tend to think that it had the flexplate because I was weighing other engines and not installing it at the time. I think at the time I was waiting to get my hands on a flywheel for the 340. I believe I ended up getting a 350 flywheel that worked. If it did have the flywheel on that would put it down into the 460-470 lb range without it. The Jeep straight 6 weighed 480 lbs and a 225 V-6 2 bbl. with no carb but manifolds, 380 lbs. I was using a giant "fish" scale hanging off the engine hoist. Unfortunately those were the days when you only took pictures of something important because it cost money for every picture.
