Stepping in on these heads,
I'm the person that posted in a prior post that the deck thinkness is only 3/8" thk.
I sell pro-comp products and have seen both b/ blk. and sm/blk heads, bare and assembled.
The flow rated posted earlier in the topic is for the full CNC ported b/blk heads. i have sold s/blk heads for street use only, but refused to sell a set to a person who has a small B&M blower on engine which was pushing 8 lbs. on a 355" with double hump heads. He did however go to another source and purchased a set of 210 runner heads, completely assembled for about $650.00. i don't know whats going to happen because he has now gone to a 383" with his new pro-comp heads (the engine is not installed yet)
The CNC ported heads mentioned earlier are ported by Direct Motion, which is right next door to ProComps old warehouse in Ca. then sent back to the warehouse where they are assembled by JR. :roll: who doesn't have a clue about racing performance or quality parts. I don't know where the valves come from, but they are 11/32" stems on the b/blks and 5/16" on the s/blks, the rocker studs are heilicoiled from the factory.
I recently sold an Eagle cast rotating assm. and a set of 210 procomp heads for a 383 street built mtr., but the .525 hyd. roller cam and all related parts were purchased from Crower, including springs keepers etc.
It was installed in a 1974 vette. I have to say that this combo runs really good for a street car.
Would i run these heads in a racing application? Not when i have $4,000.00 in a short blk with 14 to 1 comp. and a .700 lift cam with 750 to 900 lbs, spring pressure.
I can't comment on the seats falling out or the rocker location being out of place, because i've haven't seen it happen and i've never checked the geomitry of the rockers, since i've never used them. I do however agree if you want to go fast you better look for dependability.
I can buy these heads dirt cheap and still will not use them. I'm a Brodix person. and every set of heads i have (3) all have thk. decks that will hold head gaskets under load.
I was offered a set (FREE) for my 1471 blown alcohol 383 motor but i doubt if it would get off the engine stand before it popped a head gasket.
bottom line is you get what you pay for and i won't sell them to you if they are going on a competition motor.
I don't advertise on RJ or ebay, i only sell word of mouth and cannot afford to replace a good short blk because someone bought the wrong parts.
Just my .02
Zip.