Pontiac lover's 495 521cid shortblock,no wimpy 462 this is 521 cid of pontiac power and torque.These will make 620 670lbs plus of torque and are the most street friendly motor you have ever owned.Great idle and vac. flat tappet,roller,iron or alum. heads it likes them all.This is for the short block only,but can finish to any level you wish.The block is a 1967-1970 casting that was baked,blasted,magged,linehoned,decked,arp main studs,brass soft plugs and durabond cam bearings.The crankshaft is a forged 4.500- 4.750 stroke riding in speedpro bearings,rods are hbeam with arp2000 bolts,pistons are custom JE forged with coated skirts,duel pin oilers,tool steel pins,wire loc's compression is 10.1 with a 85cc head(will adjust for your head) valve reliefs will clear .630 lift cams the assembly is balanced total seal gapless rings to keep the gas were you need it.Yes they are as happy on the street as they are on the strip.For about the same $ as a 462-472 you can have a 495-521cid ground pounder Pontiac!!We have many other combo's building Pontiac power for years give us a call we can help. D-ports wideports highports EFI for sale local $125.00 to skid up.Our race engines have won countless races,championships and powered many of todays top drivers to stardom.Kick the crate engine addiction build something special,get into rehab before it's to late!! 616 897 7679 8-12 week delv.We are also a KRE and Wiseco dealer call us before you buy a set of alum heads or if you need a custom set of pistons.Due to all the bad apples $175.00 due within 24hrs FREE shipping in the lower 48 lift gate extra