Hello....My 1975 Chevelle, work in progress . One off the first changes was the engine over to a 406 sbc..... which the bottom end off this engine is ( STOCK ) I used all the original Rotating assembly...I had to Straighten the cylinders as they were worn...Putting back in for Pistons was the factory Replacement Cast Dished Pistons / 9.00 compression / 5.700 rod lenght / 4.155 bore / 3.750 stroke ...So shes stock...after this I needed a Top end kit doing So I find this Sbc Top end kit on Ebay which cought my eye....I called Bryan Fields and He helped me out a great deal....as he recommended the top end kit that I needed.... and If you no anything about engines its all in the top end that makes the power ...So what Bryan recommened I was able to pull out some GREAT numbers on the Dyno and consistent....406 hp and 485 ft torque at 5100 rpm at 32 dergee timing..... and there is more power there also at 36 to 38 degree timing ....but I had to come to reality as the bottom end is STOCK and afraid off Melting my Cast pistons.....I decided for the efficient Hp and torq......Bryan I thankyou once again For the Great engine package and all your help then and now ....CHEERS from your new friend in Canada....Andrew