how much clearancing will there be with the 4.150 crank?

Dave, the last 470 C.i. bracket motor I made and dyno tested made 720 HP at 7000 RPM( not peaked yet but the customer didn't want to test it any higher ), it was a 440 block bored to 4.380, 3.91 stroke, 7.1 rods with a set of KB Icon flat top pistons with valve reliefs(true 12.8 to 1 comp. ratio) a set of CNC MCH ported B1-BS heads (flowed 350 CFM at .700 lift)with a set of 1.5 Crane extruded aluminum roller tip rocker arms. The cam was a Crane custom grind that had the same lobes on both intake and exhaust, 273 degrees @ .050 with .420 or .430 lobe lift(CRS ). It had a sheet metal tunnel ram with two Holley 750 D.P. set of by Jet industreis in SO CA. The manifold and heads was the highest price parts on that motor and both of them where bought used at a decent price Lots of choices out there IHTH

You here of good numbers from any of the combos from 470-512 as mentioned before. I started to build a 500 based on the 400 block and was gonna go for a short piston and get the rotating assembly as light as I could. plans have changed and if you are interested I am going to be selling my eagle 4.15 crank that is brand new it has mopar rod journals also have clevite main bearings. I have a set of ported sr heads too that will be getting moved as well. I was planning on running mid 9s on e-85 but high 9s shouldnt be to hard on pump gas. Lot of strong running 400 strokers out there. good luck with the build.

Cody

I like my 500" stroker. 12.4:1 compression with KB ICON (440 source) flat top pistons, 0.040" quench and max wedge victor heads (75cc chamber.) The only clearancing needed was just a bit from the oil pickup boss, did not need to notch the bores, and I run an internal 1/2" oil pickup. I also have the BCR caps and girdle, nice stuff, just watch the oil pan to drag link clearance as the girdle will make the oil pan a 1/2" lower.

My friend is running a 470, but it is an older build with the Mopar size rod bearings. I can't recall if the bores need notched for clearance, but it is using custom domed pistons to get 13:1 compression. The custom pistons cost over $1,000+/set.

The 512" stroker kit looks good too, 13.15:1 compression with 72cc heads, and it looks like the block won't need to be milled to get the pistons to zero deck. On the other hand if the pistons are above deck, make sure to use the correct thickness head gasket. The 512" kit also has an off the shelf domed piston it you have larger volume heads.

With any of these pistons, check piston to valve clearance. I think they will clear a cam with about 270 @ 0.050 duration, but a bigger cam may need deeper valve notches in the pistons.

I have run both 3.915" and 4.250" stroke in a 400 block.
I recommend the 4.250" stroke and 6.535" rods with 2.2" bearings. This actually fits in the block easier/better than the 4.150" stroke and 6.76" rods with Mopar 2.375" bearings.

In my 4.250" engine, I have Indy 440-1 heads milled to 68cc combustion chambers and it gives 13.5 CR with a flat top piston made for a "451" engine (1.300-1.320" compression height). So if you want just 13.0, it can be done easy.

If you do decide to go big block, don't stop at 470 if you are starting from scratch.

brownout, I will send you a pm.

jim, can you explain how the 4.25 crank fit better than the 4.15? oil pickup boss and cylinder notching?
so, what kind of power do's your 440-1 13:1 motor make? whats the car weight and whats it run?

that will depend on how well the block really sonics out.

ok,i understand. would 440source be a good place to by good quality crank and rods from?

No!

well i got a 440 source 440 crank> we shall see. it was real hard though. was a [Edited by Moparts - Family Friendly Site - Keep it clean] to drill to ballance it.

well,i have seen one of their cranks break,but who knows what was going on in that engine. maybe it had a ton on detonation? i'v seen eagle cranks break too.
so who has affordable quality cranks and rods?

Something you have to keep in mind too Mopar Dave.... big cube engine can make a ton of power down low. My mech cammed stage VI 13-1 race engine sported a welded stock forged crank, stock main caps with ARP studs, stock LY rods with MP bolts, no block fill, and some light Ross pistons. I shifted at 5800, and trapped at 6200. It netted a best of 9.93 in my Mirada. We freshened that engine four times in 16 years and although it was worn to an "n'th" of it's usefull life, still ran really good.

torque is what i'm lookin for.
looks like k1 makes a 4.150 crank with 2.20 journals for lo deck.