Thread: stroking a MKIV 2-bolt main?

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Originally Posted by 67cherry

haven't called yet but it seems as though there are plenty of companies that would make custom pistons for this combo - maybe not though... maybe Arias or Venolia just thinking off the top of my head

if one thing that need s to be custom not the all of the piston then its not to bad so lets say you see a piston in a company stock you like. you call them and give the number of piston and then give them the pin height you need most all companys will want you to sign off on the bulid sheet that states what you want change on them before they start 1/2$$ down so you will own them if you screw up thats on you. if this is to much then have your machine shop or engine builder call them and if they can not then i would not spend any money with them .there is many rings out there so you many be asked about ring pack radial width and what forging 400 or 2618 so it can take time filling the sheet out but changing just one thing on a shelf piston you want to start with a 496 piston with the same rod so CH and net shape of the dome cc as piston CR with raised. so the 4.375 cranks are bit more work . as for max out with stock block is 511 and 541 with the tall deck . and 9800 big m 582 to 587. the 4.1/2 crank tal deck Gm 525. then big M others blocks 632/638. as for custom i had JE /wiseco . Ross . Racetec. BRC .Diamond .and the list of reworking them is much longer right now in the shop for a shelf or a stocking number piston. i like the Icon line by united engine and machine company . and for big money builds like a pro stock head like big chiefs then wiseco customs builds Diamond as there close to the shop and have been using them before they were fully in to just making pistons . most all the companys i listed over the years i ran in to problem with .like getting piston out on time. calling me and asking if i would take a 9 set of pistons with the one of 9th with a flaw in the intake fly cut. radial width to deep on a 043 ring and 1.5 there is no SAE on . making a piston with a top ring that i did not ask for then they did not make a ring for . putting the valve anges off on a big chief heads .not putting fly cutting in the right place on big chief pistons . not drilling gas ports in to top ring land busting a drill off in the piston. over sizing the pin holes to .003 and that just the ones i can think of now. the ring pack or oil rail it a no mans land with all the sizes of rings and made up there no SAE on some stuff so you need to tell them what you whant . ring sets so you need to be on top of your game . you better know more then the guy on the other end of the phone about pistons bad thing s can happen most all thing i listed was just poor help sad thing that realy reflex on the company name .and a sure bet i will see them at the PRI show face to face for some talking