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305 Small Block 23º Flat Top

    PISTON DESIGN
  • Advanced, lightweight FSR forging that eliminates stress concentrations for superior strength
  • Up to 20% lighter than traditional equivalent
  • High-silicon 4032 aluminum alloy for reduced piston-to-wall clearance and quiet operation
  • Accumulator grooves for improved ring seal
  • Designed for normally aspirated or moderate forced induction/nitrous applications
  • Now includes high performance skirt coating!
    RINGS INCLUDED
  • Lightweight, low friction metric ring package included
  • 1.2mm top ring, 1.5mm 2nd ring, 3.0mm standard tension oil ring
  • Minimal filing required

    PINS AND LOCKS
  • High quality 2.250" pin further reduces reciprocating weight
  • Carbon steel wire locks included
305 SERIES FLAT TOP
Std Bore: 3.736
Ring package designed for: 1/16, 1/16, 3/16 Rings

Tech and Installation Tips
Valve Relief Diagram
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
52cc 58cc 64cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
170771 310 3.766 3.480 5.700 9.000 1.560 10.8 10.0 9.3 -5.0 412 Flat Top 0.030 J100F8-3766-5
170772 315 3.796 3.480 5.700 9.000 1.560 10.9 10.1 9.4 -5.0 418 Flat Top 0.060 J160F8-3796


APBA - 305 APBA FLAT TOP & DISH SERIES
Std Bore: 3.736
Ring package designed for: 5/64, 5/64, 3/16 Rings
Part # CID Bore Stroke Rod
Lgth.
Block
Ht.
Comp.
Ht.
Head Cubic Centimeters
52cc 58cc 64cc
Compression Ratio
Dome
Vol.
Gram
Wt.
Footnote Oversize Recom.
Ring Set
174002 310 3.766 3.480 5.700 9.000 1.560 9.8 9.2 8.5 -12.0 472 M, Dish 0.030 NA
174004 310 3.766 3.480 5.700 9.000 1.560 10.8 10.0 9.3 -5.0 504 M, Flat Top 0.030 NA

- Denotes part # has been issued a new part #. A list referencing old part #s to their new counterparts will be available shortly.


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