400 to 451 stroker questions

Jeremiah said
Have any of the posters in this thread ever built and beat on a stock 440 crank equipped 400 based 451 stroker? It does not appear to be the case lol. There is no harm in turning down the 440 crank. That isnt where you are going to break anything. The cylinder wall is likely to be the weak link.

The Mahle pistons have 1.5/1.5/3.0mm rings. Use a GNS or hellfire top ring and life will be good.

1/16" = .0625"
1.5mm = .0591"

Are we really think .0035 is a game changer in the ring pack durability? No, it's not.

And lastly, Andy mentuoned he removed the 451 manifedto from his site because it was obsolete with the parts available in 2022.

My juice cam 451 dyno'd at 500/500 hp/tq with big valve 906's at 9:1cr. It made 572whp through the manifolds on a 175hp n20 shot. The standard plasma moly rigs look perfect after 50 bottles. It had to come apart due to a split cylinder wall that showed up when it was idling in the driveway.

All of the above are facts that I know first hand. Aka not internet expert speculation lol

Actually, yes going from a .0625 ring to an .0394 ring is a HUGE move. Friction drop by a big percentage. That’s just the fact of it.

And that Hellfire ring is nothing more than a ductile iron moly ring, both of which are horribly obsolete. It’s damn near 2023 so it’s by far past time to force the idiotic piston manufacturers to stop producing ANY piston with a 5/64 ring pack and to make one, maybe two part numbers with 1/16 ring packs for guys what want to stay in the Stone Age.

The thinner ring will make more power, less heat, last longer and seal better after 50k miles than a thick ring. This is 2022 common knowledge and FACT.

What’s funny is 20 years ago the same guys were crying about 1/16 rings being too thin to seal in a street car, that they had no benefit blah blah blah. Same **** we hear today.

The OP can spend his money any way he wants. To make a ring decision based on 1980’s technology is bad policy.