-40%
66 69 PONTIAC OHC6 PISTONS, 250 ONLY, 4.000
66 69 PONTIAC OHC6 PISTONS, 250 ONLY, 4.000
66 69 PONTIAC OHC6 PISTONS, 250 ONLY, 4.000

66 69 PONTIAC OHC6 PISTONS, 250 ONLY, 4.000" BORE. 35 GRAMS LIGHTER THAN OTHER P

$ 190.08

Availability: 100 in stock
  • Return shipping will be paid by: Buyer
  • Item must be returned within: 30 Days
  • Brand: Pontiac
  • Type: Piston
  • Condition: New
  • Refund will be given as: Money Back
  • Returns Accepted: Returns Accepted
  • Restocking Fee: No

    Description

    HYPER EUTECTIC {SILICONE ADDED} DESIGNED TO RUN TIGHT CLEARANCES. TOP OF PISTON IS ABOUT .020" TALLER TO COMPENSATE FOR FELL PRO HEAD GASKET. VALVE NOTCHES ARE OHC6 AND WILL SUPPORT A .025" STROKE ON A VIRGIN CRANK SHAFT GROUND .029" UNDER, OFF SET GROUND. WILL NOT CLEAR VALVES WITH A 230 4V HEAD. ABOUT 35 GRAMS LIGHTER THAN TRACTOR PISTONS.  THIS IS A KB 156 4,000" 327 PISTON, FLAT TOP. ALSO AVAILABLE IS THE KB 157 WHICH IS A DOME TOP WHICH  WOULD RUN ON A 250 1V HEAD, OR GIVE ABOUT 11 1/2" WITH 250 4V HEAD ALSO, THE KB 158 WITH A DISH TO LOWER COMPRESSION , WHICH IS THE PISTON i HAVE RUN FOR 11 YEARS. COMPRESSION READING RECENTLY WAS 140 POUNDS AND 120 POUNDS...DID NOT BOTHER TO CHECK THE REST. I WANTED TO RUN THE LOWEST OCTANE AND STILL GET OVER 40 MPG. ENGINE IS 266 CUBES WITH THE 4.000" BORE, STROKED CRANK ADDS 3 CUBES. ALL THREE ARE AVAILABLE IN 4.020 WHICH I WILL NEED FOR MY ENGINE. PRODUCTION WAS AUTHORIZED ON 7/15/2021, ESTIMATED DATE OF COMPLETION 9/15/2021.      DO NOT HIT THE BUY IT NOW BUTTON UN LESS YOU WANT TO PRE PAY. PISTON IN PICTURE WAS SENT TO ME TO CHECK VALVE CLEARANCES. TOP AND BOTTOM RINGS ARE 1/16" THICK FOR LESS WEIGHT, OIL RING IS 3/16".