BBC CHEVY 496 540 572 DART 345cc REC. PORT ALUMINUM HEADS BARE SET/PAIR
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DART PRO ONE 345cc BARE BBC HEADS, WITH CNC'D COMBUSTION CHAMBERS.
122cc COMBUSTION CHAMBERS 345cc runners.
This sale is for a set of heads (2 bare heads).
PART # 19300030. INTAKE RUNNER: 345cc. DART'S HIGHLY POPULAR BIG BLOCK CHEVY PRO 1 HEADS FEATURE. ROLLED VALVE ANGLES, IMPROVED SPARK PLUG LOCATION, RAISED EXHAUST PORTS AND FAST BURN CHAMBERS. CAN BE USED WITH SHELF PISTONS, VALVE TRAIN COMPONENTS AND INTAKE MANIFOLDS.
Pictured below is the CNC'D combustion chambers.
The cnc'd combustion chambers were done for us by Dart. We have found this feature to increase the HP numbers by approx. 10-15.
To be clear on this the runners are not cnc'd, just the combustion chambers.
We have complete top end hardware kits available for the Dart heads in our other listings. The kit has the correct head and intake gaskets, head bolts with special washers, and stainless intake bolts. The part number is TEK-1017-1275, or any TEK kit that has the 1275 part number in it. The first number is the type of head gaskets, and we have several different head gaskets that will work with the Dart heads. The 1275 is the intake gasket part number, and that is mandatory for use with these heads.
Uses valve size 2.300 and 1.88. These heads have the correct seat diameter to allow the use of these valve sizes.
Guide plate recommendation.
We strongly recommend the use of the Dart adjustable guide plates with these heads, or with any BBC aluminum heads for that matter. These guide plates will allow better rocker tip alignment due to the fact they are fully adjustable. We use them on every set of BBC heads we install on our engines, including the Dart Platinum Pro-1's, and AFR heads. The rocker tip may end up offset to one side more than is acceptable when using fixed guide plates, and the Dart adjustable guide plates allow a decent amount of correction. The variances in stud position to valve guide alignment vary on all brands of heads. The rockers could also contribute to this issue, as the trunnion or rocker body could have variance. By having proper rocker tip alignment, you are distributing the pressure on the valve tip evenly. This not only reduces uneven valve tip wear, but also prevents undue stress on the valve guides in the heads. The part number for these guide plates is BBC-ADJ-GP. See our other listings for these items.
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