Sorry, that would be useful. 500 EFI, 525 EFI, and 700 SCI. Even the Mag motors too if I remember right.

Absolutely. At that level you're beyond plug 'n play.

Wow. That's getting pretty sloppy. This is brand new out of the box measurements?

Yes, it is also AFR and Dart's recommendations for naturally aspirated open cooling marine applications. Straight from my tech guys mouths this afternoon. .0017 to .0018 is for street strip only.

My experience with AFR has been very positive wether the guides are tight or not, they dropped a new casting in the cnc machine for me within hours of me calling them to address my issue, I will be sending the head back to them that failed and wait for the outcome, I show tight, they may not.... could have been a bad day at AFR, maybe not....

would I buy AFR again, ABSOLUTELY.... but also for great lakes open cooling use I will buy bare and build myself....

A was also talking to Dean Gellner last week before this happened, he told me in general conversation all heads for open cooling marine use should be machined for it, and DART, Brodix and Edelbrocks all vary and are too tight in his opinion...he is not new to this stuff either...

my guy and also Gellner sets them up around there for all marine applications...

That's because it's a 3/8" valve..........

Interesting stuff.

Here is my thing. And I'm not trying to p in Tim's cheerio's. This is just my observation. Everyone mentioned that runs things on the loose side I'm sure know what they are doing and successful at it. But there are a ton of guys that are running AFR's heads out of the box. Besides Tim there are no other reported failures. You guys know how it is on OSO. If there is some junk floating around it doesn't take long b4 the word gets out. At this point we know what the out of the box clearance numbers are. They are what AFR states (mine a hair loose). So, what's the deal anyone have some more carnage pics or what?

Here's something to think about: AT THE END OF THE DAY, THE PERSON, GROUP OF INDIVIDUALS, PROFESSIONAL ENGINE BUILDER, are the ones responsible, for all final measurements, inspections, assembly of an engine, if it's going to run properly or fail. If a part is going to fail, it would be after the fact, metallurgy, porosities, proper engine clearances are the responsibility of the builder.