This guy want to sell me a Standard Short Block 350, 2 bolts main, Casting # 3970010. I know the this block have a high nickle.
Do you think this will be a nice block to build as a 383. He just took it out of a 70 Chevy Impala. He only wants $50.00 for it with crank, pistons, and rods. It has alot of oil buildup in the lifter gallery and will need to be Hot Tank and Magna Flux. My educated guess is I cant go wrong for 50.00 bucks. Now I need some recommendation on where to buy a good streetable 383 stroker kit to produce about 375-430 ft/tq. I want to build it to match my Pro-Built 700R4 Transmission and A.C.T. 3000 Stall.
Recommendation highly encourage.

 

If that is a 1970 block, you are looking at one of the best biult 305. I would get the 2 bolt splayed and look through summit for all of the parts. Jegs might have what you need as well. A 2 bolt splayed is stronger than a 4 bolt splayed. I would go for it. Just don't forget about your drive shaft and rearend. If they can't handle the power then you are SOL. And keep in mind about the sus.

 

any facts...data...experience to back that up ??? not flaming just asking. Ive heard this on the 400sbc but not the 350.

 

Hey DTL, what ya gonna do with the 283?

 

I dont know yet have not really had time to dissolve the 400 $50.00 block. Well the 283 is finish, all im waiting on is for probuilt to finish my tranny 700R4 Street/Strip. Right now I have a big decision to make. 1 Install the 283 then later swap for the 400.
2. Get to working on the 400 done and hold out installing the 283. Man if I would have received my tranny I would have put the 283 in this week. So now im caught between a Rock and a Hard spot. Plus i need to have the block 400 Cleaned and Magna-flux before I make any real big plans. She was a Virgin, from what I can see the guy spin the #6 bearing so will need a new crank.

 

We do have the same motor with the same spun bearing...wow.
put the 283 in and have some fun while building the 400...easy swap when you are ready.

 

www.enginekits.com

383 kit check it out for 469 bucks

 

all this time i was thinking a 2 bolt main would just be crap. geez. When you guys use the term, "4 bolt main" what does it exactly mean. All i've been taught so far from people so far is to ask "2 or 4 bolt main?" and if they say "2" then say "no". anyone wanna give me a real quick lesson?

 

Splayed two bolts generally come with steel caps. Because the bolts go in at an angle crank stresses are directed toward parts of the block other than the main webs. This is why splayed mains are stonger than 4 bolts. However, most 4 bolt blocks came with thicker cylinder walls and decks making them much stronger in that area. I don't know if it's possible to used splayed mains on a 4 bolt block.

 

hey I heard 4 bolt mains are like performance engines and 2 bolt mains are like passenger cars, something like 4 bolts have better acceleration or something like that.... does anyone have any Idea of what I"m talking about???????????

 

the only difference i know is that most 4 bolts came in trucks, while most 2 bolts came in cars, with SOME hi-po cars getting the 4 bolt main. as for the "added acceleration" thing, i dont see how, because 4 bolt only refers to how many bolts hold on each endcap. i would guess if GM built the 4 bolts a wee bit beefier from the factory then that would explain it, but if you built an identical 2 bolt and 4 bolt then i would think that they would have equal performance. please correct me if im wrong, i dont wanna mislead anyone.

 

same as far as cubic inches...but the 4 bolt will naturally hold up better in high rpm situations..or a high torque motor....2 or 4 has nothing to do with making power, just the ability to hold together.

 

I'm about sick of this 2 bolt-4 bolt argument, if we all agree that G.M. knows what they are doing(obviously we all own their cars) then we should also agree that the 4 bolt blocks that came in heavy duty applications are probably stronger or they wouldn't have been in heavy duty applications. There would be no reason to offer a 4 bolt block if it wasn't any better, they could have saved some money and time making the castings. For the record most any engine under 500 horse is fine with a 2 bolt block end of story. An for proof my old shop teacher had a 9 second car with a stock bottom end 2 bolt 350 and it was run with both nitrous and a supercharger.