20-ish years ago someone sent me some ported stage VI heads to look over/go through.
The ones MP was selling that were done by Arrow racing engines.
They were still new in box.
Granted, stage 6’s were as bad as I’ve ever seen for poor manufacturing QC...... but those ported MP heads were absolutely nothing special..... at.....all.
And they had some of the typical stage 6-ism’s....... that hadn’t been addressed one bit.
The bottom line is........ heads that are being sold out of a catalog(especially from back before CNC porting existed), are built/reworked based on a fixed price point(yet advertised for a pretty high MSRP).
While I’m still giving these Mullen heads the benefit of the doubt that they would exceed 253cfm on my bench....... I also wouldn’t be shocked if they didn’t.
