OK SO I WAS WONDERING CAN I PUT A CRANK FROM A 305 INTO A 307 OR 327 BLOCK TO MAKE A 350? WOULD I HAVE TO MOD ANYTHING? WHAT ABOUT THE HEADS?
The 305 and 350 share the same stroke (thusly the same crank) the only difference is the bore. The 327 would have different main diamater, so the 350 crank would not work without being machined. Heads interchange between all smallblocks. And an introduction is in order. We'll see you in the intro forum...
LIKE HE SAID SAME CRANK. Which Block Do You Have A 327 Or A 307 ??? Both Good Blocks Dont Let Them Fool You Just Cause 350 Are Whored Out Like ................whores. 327 And 307 Are Both Good Blocks. 307 Actually Revs Up Quicker. It Was Chevys Small Stock Version Of A Stroker Motor. ABOUT THE HEADS ALL SMALL BLOCKS ARE INTERCHANGABLE BUT WHEN YOU UNE 350 AND BELOW HEADS ON A 400 SMALL BLOCK IT IS BEST TO DRILL THEM FOR THOSE STUPID STEAM HOLES. THIS WAY YOUR 400 BLOCK DOESNT OVER HEAT. THEY RUN HOT 200 DEGREES NORMAL ANYWAYS. YOU REALLY DONT WANT TO GET THE 400ci BLOCK TO HOT. THEY HAVE WEEK SIAMESE CYLINDER BORES
so if i had a 307 block and a 305 crank laying around would it be wise to build it into a 350 since same bore. could i use the main of the 305 sorry about the intro part i must have missed that in the rules
Oh boy, this stuff again! First off, the 305 and the 350 do have the same stroke (3.48"), so cranks will interchange on like years. The 307 does NOT have a 4" bore, however, although the 327 does. You CAN put an early (two piece rear main seal) 305 crank into a LARGE JOURNAL 327 block and use 350 pistons to build...a 350! Small journal 327 engines use a different crank journal size, smaller than that of the 305. There are all sorts of "Frankenstein" combinations you can come up with by swapping around small block Chevy parts, but trying to re-invent the wheel just for the sake of doing so will get you nothing but grief in these circles! What is it that you HAVE, and what are you looking to accomplish with it? You may be better off building the 305, or 307...or what-have-you in the end. If all else fails, build a (gasp!) 350!
No, the early 265 and 283 engines had the same smaller journal size as the small journal 327, but the 307 had the newer "large journal" crank.
so fat hack if i have a 77 305 crank i could put it into a large journal 327 to create a 350 and it would not really be that frankeinstienish.
Thank you for knowing about the sbc, thats very hard to find someone that actually knows and wont just say "no it will work"...................
Both 305 and 350 share the same 3.48" stroke. I think around 1986 they went to a 1 piece rear main seal so if you wanted to swap a 305 crank into a 307 you would need a pre 86 2 piece rear main seal crank. I believe 327s are mostly small journal with a 3.25" stroke. The 1968 327 might be large journal if I remember right. To my knowledge all 307s are large journal with a 3.25" stroke. A 305/350 crank will only work in a large journal block so if you have a 67 or earlier 327 a 305/350 crank won't work. Also the 307 has a 3.875" bore so putting a 305/350 crank in it won't give you a 350 without boring it .125" oversize which I'm not sure if you can get away with and still have enough wall thickness on your cylinders. Confused? If I had a 327 I'd run it as is since they are pretty cool and rev well. In fact I was thinking of throwing a 307 crank in my 350 to give me a 327!
i have a 327 that i was gonna redo and a 305 crank so i was just wondering if i should go with just a 327 or make a 350 since i am gonna do a
Yes...the 77 305 crank will be compatible with the large journal 327 block and all you'd need is a set of 350 pistons to go on your rods and you'd have a 350. It isn't really "Frankesnteinish" at all, but it's an odd way to arrive at what you can just pluck from a junkyard as a factory 350. However, if you have the parts on hand, it's a great way to build the single most versatile small block Chevy to date...the legendary 350!
well the block i have was used for 307 and 327 so i just assumed that it would be the same. am i confussed or?
327 has a 4.00" bore and a 3.25" stroke 307 has a 3.875" bore and a 3.25" stroke If you have a large journal 327 it's an easy swap. If you have a 307 you'll have a hard time finding a piston with the right compression distance for that bore/stroke/rod length combination.
The 302 and the 327 both DO have a 4" bore...and so does the 350. Chevrolet casting numbers sometimes identify blocks as being either for a 302, 327 or 350 in some years and applications. However, factory 302 engines ONLY came in first generation Z28 Camaros and are pretty rare and pricey (The 3" stroke, large journal steel crank and the 302 pistons being the unique items needed to build a 302 out of a common 327 LG or a 350 block)! The 307 had a smaller bore, but used a crank in common with the large journal 327 engines (3.25" stroke). The 305 was just a small bore 350 engine...same crank, same stroke...smaller bore and pistons. Your block will accept the 1977 305 crank because the early 305s still used the two-piece rear main seal. You just need a set of 350 pistons...which you can buy new for dirt cheap!
THE BLOCK I HAVE IS 3814660 SAYS FOR BOTH 302 AND 327 68-69 SO COULD I PUT MY 305 1977 CRANK IN THIS ?
The 77 305 crank will physically bolt into a 307 block no problem...but pistons would be an issue, unless you bored the 307 block to a 4" bore to accept 350 pistons. (Some machine shops actually used to do this in the 80s and 90s around here...they'd sonic check 307 blocks and if they checked out okay, they'd bore 'em out to accept 350 pistons...but I don't recommend it. It gives you a thin wall engine that won't likely take another rebuild!) Now, a 307 crank in a 305 block...you just stay away from that one now, ya hear?! (Trust me on this!!)
You could put a 305 crank in a 302 if you have a 302 and make a 350 out of it. If you have a complete 302 I'll just trade you straight up for a 350 . Here's a good link. http://www.mortec.com/journal.htm 302= large journal, 4.00 bore, 3.00 stroke 305= large journal, 3.750 bore , 3.48 stroke 307= large journal, 3.875 bore, 3.25 stroke 327= large or small journal 4.00 bore, 3.25 stroke 350= large journal, 4.00 bore, 3.48 stroke
Due to the different piston sizes, would a 305 crank require rebalancing to work correctly with 350 pistons?
Fat Hack I Just Want To Make Sure That You Are Saying Yes To The 302 327 Block Not The 307. You Last Post Stated 307
You can use a 327 SMALL JOURNAL block and a 283 crankshaft to make a 302 if thats what you are wanting to do. The only other way to make a 302 is if you actually have a 302 crank because no factory large journal cranks had a 3.00in. stroke but the 4.3 v8 in the 94-96 caprices and they are used ONLY in a 1 piece rear main block which is '86 and newer.
Thankyou Brad I Thought That I Could I Got Us All Confussed When I F##### Up The Block Saying That It Was A 307. So No Journal Issues With My Block. Straight Bolt On?
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