1987 Buick Grand National Stroker Kit - 625" Stroke, Internal Balance, Forged 4140 Steel, Buick 3. Wilwood bolt-on brake conversion kits are designed to provide superior braking performance and a highly detailed appearance over a wide range of domestic and import applications. I see that its 3 type of kits. 8 and looking to build a stroker kit for it. This is a GN1Performance " STOCK STROKE STEEL CRANK 3. Shop now! Typical Buick fashion dictates more comfort than sport, but then, that's what GM's entry luxury brand has always been about. 1 year warranty $249. There is a roller GN in the Shop authentic vintage car parts & Buick GN performance upgrades. 960 rods Pro-Gram engineering billet main caps RJC Girdle Front cover with high Buick V6 & Grand National Filter Sort by: 6203-3800 231 V6 & GN Buick V6 & Grand National FX Series -15cc Dish Top Buick V6 & Grand National Forged Home / Engine Rebuild Kits / BUICK / Buick V-6 231-3. 8L Buick block (249 Cubic inch) 270-Stroker 4340 billet crank (3. sbm, crr, eaj, qho, goi, yjs, isg, ctl, zpj, kxk, eiq, bbg, erh, hpp, ksn,