frenchyd said:
In reply to Cousin_Eddie (Forum Supporter) :
Most Chevy crankshafts are cast. Big and small block. The weights I quoted are for cast cranks. If you weigh the aftermarket forging often used to rebuild an engine yes they get heavier.
My point is every Jaguar crankshaft is forged from EN40 steel and after all machine work is done they are then hardened. That's important because not all machine shops are able to grind a hardened crankshaft. In many cases it won't be needed because it is so hard.
No. You wrote fictitious numbers. The numbers you posted are roughly half the actual weight of cast Chevrolet cranks. Don't church it up. You spew incorrect numbers to suit your agenda. Time and again.
I'm not usually one to start a tussle with someone on the internet but forum boards are suffering in these times and this is one of the few remaining boards of real quality. I don't like people habitually posting incorrect info.
Since we're so far in the weeds already, I vote for K-series Cummins. Not the puny 855 CI N-series "small block" but the 1150 CI "big block".
600 hp and 1650 torque stock. And at that minuscule power level they will run 80,000 lbs up and down the road for nearly a million miles. Turned up they make crazy power. Available in trucks from about '76 to '81. Couldn't work the fuel consumption out on them though. 3.5 mpg was about average. Everything else got 5. That is HUGE in trucking. Also they were really hard on truck parts due to being just stupid heavy.
Leave Frenchy alone.
He's posted a wealth of good stuff on here.
He might be just a little overly passionate about a certain British marque
Big/small block to me (old school hot rodder) has absolutely nothing to do with displacement, deck height, or bore spacing. There is no worldwide formula that says if bore spacing > x and if deck height > y, then big block.
It's all about family and a general size. Chevy small blocks are an engine family in which they share the same basic architecture, and could possibly range from 265ci up to 400ci in stock sizes, or up to 454 with aftermarket/machining/customization. Chevy big blocks could include the early W-block since they were relatively larger in both displacement and physical size compared to the small block, but they typically came in 348 or 409ci displacements. Gen/Mark Chevy big blocks came in 396-454 from the factory, but could be up to 540ci with aftermarket stuff.
It's not about the displacement at all. It has to do with one family of engines that could range greatly in displacement, but they all share a common basic architecture and mostly interchangeable parts.
A good example is the Ford family. A small block Cleveland or Modified (like a 351/400) has a deck height of about 10.3". A Ford L385-series big block (429/460/etc) has a deck height of... about 10.3".
Engines like the Pontiac don't have big/small blocks. They are all the same basic family. Some people call the 421, 428, and 455 "big blocks" but the main difference is the size of the crank journals.
In reply to Curtis73 (Forum Supporter) :
The 351C had a deck height in the 9 inch range. I get my Clevelands, Windsors, and Chevys confused, but they were all in the 9.2-9.3-9.5 range.
Ford wanted an engine in the size range between the 460 and the 351, so they started casting 351C blocks with the 460 deck height so they could easily run a longer stroke. Knowing a little about how they manufactured blocks, this was probably 100% so they could use existing tooling. This was the 400.
Later, after they realized they probably shouldn't have stopped building the 351C, they started to stick 351W cranks in the 400, to make a really, really big 351...M. Because of course they made the 400 with 351W journals and not 351C...
So that is three engine families that Ford made with 4" bore and 3.5" stroke with the displacement 351, all with different deck heights, from different engine families, but interestingly the same bore spacing and head bolt pattern.
All of them are newer than the FE 352, which had a... 4" bore and 3.5" stroke.
In reply to Pete. (l33t FS) :
I think we're basically agreeing (although I also get my Fords mixed up). I just never applied a hard and fast rule to big/small. Just that this family was bigger than that family :)
A 401 CJ said:
Leave Frenchy alone.
He's posted a wealth of good stuff on here.
He might be just a little overly passionate about a certain British marque
And a wealth of wrong information as well, which isn't wealth at all is it? Even his Jag v12 info is incorrect. If you do your own research outside of what he tells you. It ruins threads and sends them to hell.
ShawnG
UltimaDork
5/18/21 9:17 a.m.
I always thought the big block / small block thing was when a mfg had multiple engine designs in production and one was larger than the other.
SBC / BBC (let's just ignore the W engine abortion)
Buick
Ford had the two I6 families but the V8s are a hot mess. If someone says big block / small block Ford, everyone knows they mean 385 vs Windsor
Pontiac only had one size.
Olds and Caddy I'm not familiar enough with.
Nobody cares about Dodge.
In reply to yupididit :
While I've never claimed to be perfect I'm curious as to what you disagree with about Jaguars that has you so up in arms ?
Imagine you have a group of friends where everyone enjoys talking about food- preparing it, serving it, flavors, nutrition, etc. And in every food discussion, no matter what it's about, there's that one guy that just shoehorns the one food he loves into the conversation. For example:
You have a conversation about steak- various cuts, how best to cook it, the protein and fat content. And this one dude busts in and goes "HEY GUYS DID YOU KNOW THAT CORNED BEEF IS SUPERIOR IN EVERY WAY TO STEAK AND CAN BE PREPARED BY ANYONE FOR 15c AND BACK WHEN I WAS A CHEF IT WAS ALL I PREPARED AND I WON MANY AWARDS ANDandand..."
OK. A little annoying but whatever- then, a week later while discussing the ideal diet for a distance runner, mid conversation that same guy is back with "YOU MAY NOT KNOW BUT CORNED BEEF IS AN IDEAL FOOD FOR ATHLETES AND MANY FAMOUS ATHLETES SUBSIST ON A DIET ENTIRELY OF CORNED BEEF ANDandand..."
You'd get a little berkeleying tired of hearing about corned beef, right?
In reply to ¯\_(ツ)_/¯ :
I really like corned beef hash for some reason.
Curtis73 (Forum Supporter) said:
In reply to Pete. (l33t FS) :
I think we're basically agreeing (although I also get my Fords mixed up). I just never applied a hard and fast rule to big/small. Just that this family was bigger than that family :)
The long and the short of it is, I was waiting for them to make a 4" bore 3.5" stroke Mod motor 
In reply to barefootskater (Shaun) :
Not today. Yet.
frenchyd said:
In reply to yupididit :
While I've never claimed to be perfect I'm curious as to what you disagree with about Jaguars that has you so up in arms ?
Not up in arms. But, you're not going to bait me either.
¯\_(ツ)_/¯ said:
Imagine you have a group of friends where everyone enjoys talking about food- preparing it, serving it, flavors, nutrition, etc. And in every food discussion, no matter what it's about, there's that one guy that just shoehorns the one food he loves into the conversation. For example:
You have a conversation about steak- various cuts, how best to cook it, the protein and fat content. And this one dude busts in and goes "HEY GUYS DID YOU KNOW THAT CORNED BEEF IS SUPERIOR IN EVERY WAY TO STEAK AND CAN BE PREPARED BY ANYONE FOR 15c AND BACK WHEN I WAS A CHEF IT WAS ALL I PREPARED AND I WON MANY AWARDS ANDandand..."
OK. A little annoying but whatever- then, a week later while discussing the ideal diet for a distance runner, mid conversation that same guy is back with "YOU MAY NOT KNOW BUT CORNED BEEF IS AN IDEAL FOOD FOR ATHLETES AND MANY FAMOUS ATHLETES SUBSIST ON A DIET ENTIRELY OF CORNED BEEF ANDandand..."
You'd get a little berkeleying tired of hearing about corned beef, right?
You're just trying to be funny but corned-beef actually is a super food
In reply to A 401 CJ :
When I was in a really bad way, I used to get occasional care packages of food. One of the regular items was corned beef. Canned corned beef. Canned in Brazil. It was $2 per one pound can, which, even at the time, was absurdly cheap.
It had a consistency closer to coarse cat food, or maybe long-grain Spam, and it tasted more like fish than corned beef.
I get nostalgic for it, every now and then.
