Originally Posted by AndyF
Yes you are.

I tell customers that std port heads are fine for stock blocks, good MW heads like CNC ported Indy heads or TF 270 heads should be paired with an aftermarket block. Customers hate to hear that advice since aftermarket blocks suck for Mopar guys. But anything over 700 or 750 hp starts to rattle the main caps and starts the process of cracking the main webs. It is just a matter of time before the block cracks. Might last a season, might last 3 or 4 before it lets go.



I keep hearing that but we've been over 750 for a while now.

We pulled it apart for a health and wellness check last winter. Bearings, main caps and bottom end looked fine.

A few things I think help with longevity: It never sees over 6,000 rpm, it has a relatively lightweight Molnar rotating assembly, short Mahle pistons and I'm conservative with timing to keep it out of detonation.

'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.