I kinda agree......Just build a 300 stroker with the 350 crank. Small Journal SBC rods and newer 3.8 pistons with metric rings provide a better ring seal, less friction and wider selection. Also it would look like a 300. The 350 is not really a step up, but more or less sideways. Parts are just about as unavailable. Get a set of 340 Heads and hog 'em at a minimum with the 300 and a E-Brock AFB carb. Invest in some time and porting skills.
why not use the 340 crank? no matter what you have to cut the main journals way down. the heads are the same on a 300 or a 340. if your going to do all that just use a 340 and save a huge amount of machine work. the bore is the same on 300 and 340 the only difference is stroke and deck height which also means 340 uses a different intake although they are much more common than the 65 300 4 barrell intake
All of these reasons are why i'm going with the 340. I have a good set of 300 heads and the same with the Exhaust manifolds. From the factory, 10 more horse and 20 more lb.ft of torque. Take away the 10-20% B.S. factor and you're still getting a lot more torque than a 300. Intake prices aren't sky high like the 300 either. I've got 4 pair of heads, a pile of valves, just more Stuff for my 300 than the 350. When I tear down the 340 i'll have to order 2 of just about the same of everything. I plan on building the 300 also. But like I said it was pretty well maxed out. I'll just have to do another set of heads for the 340. A lotta power to be had in them there heads!! I have a 600 and a 750 Edelbrock AFB. I tried the 750 on the 300 once, too big. I also tried a dual ram air set-up, too much gas. Ran like hell tho. It's just that I know a lot of little thing's to do to the 300 to get the power out of it. It's more period correct too. I'd love to drop in my 425 but what a PITA. I have a whole can of Buick green paint too. Get a set of Aluminum valve covers and i'll be jammin. I don't know about my 3:55 rear gears tho. I put those in when I planned on my 455 install. But I guess i'll just go with them and see. I can always go higher. With the OD and lock-up I'm doing 2 Grand at 70. Woah, i'm dropping off. I better get going. Oh Sean, "The Old Guy" re-jetted my 800 QJ more for a 350 but I still need to try my stock 750...Later... PONCH
Sean, That's good stuff to know, Thanks! GranSport Sedan - Do you have the entire build for the 300 worked out? I'd like to hear/see your plan if it's cool with you. Lightningbird - that sounds like a really interesting build, it makes sense too. Do you have more info on this particular build? Ponch - sounds like you have it worked out pretty good, I like to hear/see more on your build if it's cool with you! Guys, this is all good info and I'm grateful you all are sharing it, thanks again!! Initially I thought the 350 would be the better way to go, now I guess not so much! Doug
64SkyConvert - no problem, I'm more than happy to share my thimble amount of knowledge with anyone willing! Doug
Here's what I do with my valves. These are 350's. Also a cross-section of a 300/340 Head. I use it to tell where I can take some Meat out of the way. It worked well on my 300. I've had these pics on here before about 3 Years ago and there was no interest in the little guy's back then, i'm glad to see the intrest has picked up. I did the same on my 350 but I think I took too much out. It doesn't want to run very well under 15-18 Grand. As far as swapping around parts between the Three Small Blox, it's too complicated. 300 pistons will fit a 340 but not the rods.A 340 crank won't fit because the mains are the same as a 350. 340/300 heads wont fit a 350. If you have a 2 brl 300 it has low comp pistons, 340's are all the same. A 350 is a 3.8 with Two more cylinders. I put hi-comp 3.8 pistons in my 350, 3.8" bore, 3.75" for a 340/300. I picked up my 340 and it's a smogger from Cal. So i'll probably toss the heads and use an extra set to port and mess with. But I can use the heads I already did from my 300. If anyone has questions I can answer with what I know. Don't expect a lot as i'm just a shade tree guy except i've moved into a garage. PONCH
I didn't read the entire thread but my vote is keep the 300 or get a 340. Ponch was very dissapointed with the 350. The 300 is a great engine and with a little smoothing out make a great street runner. The 340 is obviously better but the 300 can hold it's own.
Ponch, thanks for the up date on the info. The 300 has always held my interest I guess like most people tire looking for aftermarket parts for it gets old. That's why I initially thought about the 350 but now I'm thinking hard about the 300 and seeing what could be a good combo for it. Any insight you have on it I'm up for learning!! Joe, I hear what your saying! I guess the 340 would be better in some aspects! Thanks! Doug
Well it's like what Joe said. The 300 can definitly hold it's own. I beat a chebby 350 with it. This guy had a cam and headers. Jones Racing on the side. I figured what the hell, let him have some lunch. I don't know who was more suprised Him Or Me when I walked away. The 340 won 't scream as high as the 300 but give you a little more torque off the line. Just have to watch the cam selection. I picked up a Torque Conv. 2000-2300 for my 200-4r. That'll help a bit. I was taking my 350 up to 6 Grand once in awhile. Sure sounded nice. Just glad it wasn't a boom. But i'm planning on taking the 340 all the way down and getting it tanked. It'll be a long process but i'll keep you informed. It came with a TH 350 which I plan on trashing. Also a '67 bumper that is in pretty good shape. I'll probably put it in the For Sale section. PONCH.
Ponch, looks like a good starting point. I guess you could help bankroll your build with the parts you don't need/want to offset the cost. Sounds like you've got it pretty much figured out. Thanks for keeping me informed, any info is good info and I look forward to seeing how it works out!! Doug
I'm just going to yank it, clean it and put it on a stand by my 455, 425, and 300. With the 350, Four engines in a row would look pretty cool. Let me know if you need any help. PONCH:sleep:
Ponch - Thanks, I'll remember that. I'm very interested to see how it comes along and what you end up doing with it. Doug
For sure try the stock 750 since it has and idle air circuit that is set up for a 350 cid engine. For the BBB carb on the 350 the internal air passages can be changed if a person reads the Cliff Ruggles Book and spends some time with trial and error...
this is not correct. a 3.8 is actually a 300 with 2 cylinders cut off. the deck height and stroke are the same as a 300. take 3.8 and divide it by 6 and you get .6333 litres per cylinder, mutiply that by 8 and you get 5.066 litres or 300 cubic inches. the 3.8 has a slightly larger bore than a 225 V6 and 350 sized rod and main journals. the heads are 300-340 heads minus one port. the only thing the 350 has in common is the bore
GranSportSedan - That's good info, so the stock sized 3.8 turbo pistons would fit in a stock sized 300 bore. The same would be true for 30 over (or any over bore) would also be interchangable as well. Doug
64 Sky, It look's like you've got a good set-up as it is. I like the iron heads tho. Bigger valves. and the iron intake, larger runners. What I did with my 300 manifold is get a Rotary File (Buick Name) or a Burr, those things that get tangled in your shoe laces when walking through a field,where was I . I straightened out the short turn radius on the end runners. And Rounded off the sharp edges on the carb plenum. Like I said, i'm going to try and do the "Doc" job on One of my 340 intakes. I'll have to port match it to my already ported 300 Heads. I have a set of .02 head gaskets i'll use too. I just love Hi-Comp engines. But if you already have a TH 350 some rear gears would be nice. I have 3:55 posi and they work pretty nice. Gotta Go. I'll keep in touch. Oh, a 340 crank wont work in a 300. The Main's are 350 size...PONCH
3.850 stroke in a 300 block: http://www.britishv8.org/Articles/MonsterMotor.htm 3.8 v-6 and 350 have 3.80" bore 300 and 340 have 3.75" bore
true but the 300 and 340 will easily bore to the larger size with extra to spare. head and exhaust port configuration is identical to the 225 and 3.8 V6. not sure how comfortable i would be cutting down a 340/350 crank .500 to fit in the 300 block if i was wanting to make some decent power numbers. might be better off just finding a 340 block
