I agree. But that is down the line. But if the crank becomes available before I get this short block figured out I'm definitely looking to put one in. At this point it is a stock rod, stock crank, 430 head, 464. With an eye out to do a 470 with Molnar rods(looked at the BBC rods but for a wash of money id rather the drop ins than figuring out the BBC units) as we will buy pistons either way. Just have to see what the budget will support when I get that far.
My 71 has a 464 with procharger, 5psi, didn't need to go to 482 with boost plus I left .100" more meat on the crank pin. Turns 10's and can drive anywhere, its a short fill with girdle. This year I'm turning up the wick to 7psi to see what she'll do.
Yeah, like Gary said in the post above, if you're planning on running boost, you really don't need the extra cubes.
But I do need the crank and it can be cut to stock dimensions or stroked. And if I keep the rpm to a sane level I think it can do fine in a stock block. Look at what a 109 v6 is stressed with at 30psi. And with a standalone and port injection keeping the webs in it shouldn't be a problem with good fuel.
So what stroke and what rod journal size would people want out of an import crank? I might consider having a run made if there is enough interest?
4.25 would be the easiest fit if I'm not mistaken 4.4 and 4.5 requires clearancing of a few areas maybe minor tho
2.00 or 2.100" for rod journal so chevy small block rod can be used. Stroke is nebulous since too many cubes may be redundant if a head to flow the #'s to support a 540 or 555 " motor is not readily available or cost effective for most people. Also, interest is predicated on $$$$$.
4.250 gives what 505 or 510 depending on how far the bore it stretch. Can anyone chime in on a 4.4 stroke about how much clearancing is needed, if needing a custom pan I think it will drastically drop the plug and play interest and add close to 1000 extra instantly
Something to chew on and further confuse us ha,..Tom is a very smart fella I inquired about using his current Mopar forging and this was part of his response,..the first response was basically him saying he wouldn't be interested in modifying a crank to that extent then followed with his explanation
Is the reduced rod journal necessary for cam clearance because being a start from scratch billet we can have them made so BBC rods will fit without modification? A whole lot of lessor expensive choices for rods AND bearings going this way than going with a specialty rod journal size. With lesser flowing heads with extra cubes the torque would peak in the lower RPM range and still be way up there even though the HP would be lower and the RPM would be limited, kinda how a Nailhead works out even boosted.(the torque raises more than the HP does) If setup right the car would be able to cruise on the highway @ 1,500 RPM! Pricing should be around as listed in post # 22 probably plus a couple hundred at the most if need to be higher?(going on pricing I was told about a few years ago so there may need to be an increase?)
Jim whats the correct way to figure out C/D of pistons needed for 7.250 rods if the block has not been decked yet you suggest .020 clean up ?
You can't offset grind a stk crank for 4.4 stroke, its produced from the beginning to have the extra stroke
I am budget, so I do like the idea to have it made to use the BBC 6.80 rods. And do it as a 470". Good stuff.
Just fyi Tom said he can do a billet Crank,..but would need a minimum run of 5 and all would need to be the same stroke,..$2300 each,..12mnths lead time,..so little cheaper than a Crower Enduromax but with a longer wait and obviously the need for 5 commitments Idk just fun stuff to think about I guess ha I wish I'd kept my Crower I had for the Tomahawk but if frogs had wings,...
I wish I could someday ever get the funds to do one too...........but money will need to fall from trees, I just dont think I can ever bring myself to do it if I even had to money. For me to drop that kind of coin on a hobby I only get to use a handful of times a year would be tough to swallow. If I found a deal beyond belief maybe. But good news on him being willing to take on getting us a new option. If the cranks come out as nice as my rods did I dont think anyone would complain.
$2300 seems like a lot for a "cut rate" Chinese unit. But I'm sure all of the forged stuff comes from somewhere other than here. So the money can only be cut so much and still make a profit. Not that it isn't worth it, just too much for me and my dreams.
So assume you have a block with a 9.00-inch deck height, 6.000-inch connecting rods, and a stroke of 3.75 inches. First, divide the stroke by two and add that to the rod length: 3.75 / 2 = 1.875, and 1.875 + 6.00 = 7.875. Next, subtract that answer from the deck height: 9.00 – 7.875 = 1.125. So the answer is that the piston compression height should be 1.125 inches.
