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SBC 421 cid COMPLETE SHORT BLOCK KIT. FULLY FORGED, DART SHP BLOCK 4.165 bore, SCAT 4340 CRANK 3.875 stroke, -9.5cc RD dish pistons
READY TO ASSEMBLE
The Probe SRS pistons, have a -9.5cc reverse dome dish. Compression ratio will be approx. 10.55:1 when used with 72cc heads or 11.50:1 when used with 64cc heads.
This is a file photo. Actual appearance may vary.
Dart SHP 2 pc rear main seal block with splayed center main caps. Scat 4340 fully forged crank 3.875 stroke, Scat HD competition rods with 7/16 ARP-8740 cap screws, Probe 2618 aircraft race grade pistons 4.155 bore size. Hastings plasma moly, ductile rings. 1/16 1/16 3/16 size.
Pictured below is the Dart High Performance Block that is included. Notice the massive splayed caps. This block is built for extreme duty.
The block is bored to size with our new Centroid DRX-750 touch probe block boring machine. We then deck the block with our Centroid block machine to an ra finish of approx. 15. Pistons will sit at zero deck allowing for a perfect quench/squish zone.
We often find many brand new blocks to have a sloping deck of up to 4 thous. When were finished decking the block it is within one ten thous. accuracy from end to end. Many machine shops fail to catch this as the machinery they use doe's not allow for such accuracy. The final step is to wash the block in our high pressure parts washer. You should always re-wash your block and all of the parts before assembly. This is to assure that you know the block is free of contaminants.
SCAT 4340 FORGED CRANK. 3.875 STROKE.
A complete set of King HP rod and main bearings are included with the crankshaft. The HP bearings by King are far superior to the regular King bearings.
The part number for this crankshaft is 4-350-3.875-6000 This is a first line product directly from Scat engine products.
The Scat Crankshaft is one of the best values you will ever find when it comes to crankshafts. These cranks are far superior to any of the other low cost cranks on the market. We feel the same way about the King bearings. The bearings are included with the crankshaft.
SCAT 4340 FORGED STEEL CRANKSHAFT RATED AT 800+ HP
PRO RACE BRAND DAMPER.
Pro Street Series, made by Pro Race Performance Products. Non S.F.I. internally balanced, (non-weighted)
6.75 INCH DIAMETER.
SFI APROVABLE FLEXPLATE INCLUDED.
SFI APROVABLE HD FLEXPLATE. This flexplate will resist cracking and warpage, leading to imbalance in the engine. One good telltale in identifying a cheap flexplate is the lack of welding on each side where the plate mates to the ring gear. They usually have a pale grey color to them, as they are not coated, and will rust quickly. Ours are welded on both sides, and are approximately 30 thousandths thicker than an OEM plate.
The actual flexplate appearance may vary, with either the zinc dichromate finish or the black powder coat finish.
This is an extremely heavy duty flex plate.
Your actual flexplate is balanced with the rotating assembly. Those running manual trans will need a flywheel, which we offer at an additional cost.
This short block kit is not assembled. See our other listings for this in assembled form.
We also offer this setup in a 427 cid size.
We do our own balancing with our brand new, 2013 model CWT 5500 Series Balancer. This machine will replace our 2011 Hines Legend balancer. The CWT 5500 is the absolute ultimate for precision balancing. When we balance the assembly for this engine, it will be to very high specs. Usually plus or minus 1-2 grams. We include a balance sheet with your setup.
The damper is included with this setup. The flexplate is SFI aprovable. Bearings are King HP race grade series. The cam bearings are from Dart. They are special coated bearings, and are very high grade. The rods used are Scat I-beam, competition series. These are not your regular Scat I-beam rods, but a much better rod used in many race engines. They have 7/16 ARP 8740 cap screws, polished beams. They are made from 4340 alloy. It is not uncommon to see engines making 700+ horse power using these rods.
MELLING FREEZE PLUG KIT INCLUDED.
Note from our company President, Skip White
We are often asked if the SHP block is able to handle high horse power builds. My answer is that if your building this for street and strip applications, then this block will handle most any buidup you do. 800hp builds are not uncommon with this block. Durability and longevity with high horsepower builds are not a problem with the SHP Dart block. Nos, twin turbo, blower, high compression builds are also not a problem. As many of you know, Dart has a one step up from this block known as the Little M series. Those blocks are slightly stronger in a few areas, and are more suitable for running extreme build ups, or engines running very high horsepower, and continuous duty such as dirt or circle track or all out competition drag racing. Those using the Little M block for drag racing often exceed 800hp, combined with very high rpm, (8,000 up to 11,000) The SHP Dart block should last a lifetime on a street rod, even if built up to 800hp. You will also find this block used in many marine applications.
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