**600hp sbm block limit? Or is it bs!!**

Mad Dart

Im the shop making the main caps you mentioned. I have a few sets out there running. One is a member on here with a 650HP+ SBM, runs strong all the way to 7500rpm.

Ways to make the SBM survive

Good balance
Light rotating assembly w/quality parts
ARP Studs NO 4 BOLT IN A FACTORY BLOCK
Good main caps
Hard Block Filler
Croy treatment(it does help)
Tune it to run right Detonation is a Block Killer
And pick the right block for the job SONIC TEST

Yess 500hp is a stretch for a factory build engine with cheap rod bolts, heavy cast pistons, heavy low quality unbalanced rods/crank, Low quality valves ect.

The factory stuff is fine, to a point. Mopar(and all the rest) dont put the BEST parts into millions of engines, they just can not afford to. So they use the cheapest stuff that will work for a good long time under "normal" driving conditions. I think this is where all the stories come from is guys using factory stuff to make a full on race engine with no upgrades to them.

You work on a factory rod and yes they can handle a lot of power, but it takes a LOT OF WORK TIME AND MONEY.

Thanks for posting the Girdle. Yours would be the only one I would use. I have used the Hughes Girdle and we used the secondary method of milling the stock main caps down to get an OK contact area across what was there. But as you know the stock caps then become a weak link from removing material to do this.

Still your Girdle and Caps are way superior to what Hughes offers for the Small Block Mopar.