I took that word, even after asking twice "just bolt on and go?" I was told yes custom built .

Bob recommended Isky "tool room" springs for my build with WAY less cam.. :confused:

....but I didn't buy my heads from Marine Kinetics either... ;)

Don't feel too bad Tim.. My AFR heads were sold to me as "bolt on ready" for a marine hydraulic roller application as well...
Turned out they had solid roller springs and didn't even have Inconel exhaust Valves..
Brian Alfry is a lying POS....

well thats a good thing,,better csa.:D

well not if they set the seat pressure at like 145-150lbs,,that might get you the extra .030".

did anyone ever measure the installed height and seat pressure?

what i am saying is it is not a mk thing,you could have bought your heads from jeg,s or summit and had the same issue.i think we all have learned from tim,s mishap.the afr heads i have used that came from mk all had the isky tool steel spring up grade but most don,t want to spend the extra cash so they go with a cheeper spring.i understand the idea that your retailer should know better than to sell product,s that need changes before they should be used.we all know that rarely happens and us as end user,s need to really do our homework.i agree that if a guy is putting a package togeather and that guy gathers all the information for his build he should not sell a guy a head with a spring setup for a max lift of .650 and then sell him a cam with .681 lift.do you think the guy behind the phone at jeg,s would have made a mistake like that?imo i think it happen,s a lot.

you should not need to but it appears that you can,t trust anyone these days.

You have to admit, bob was spec'ing my builds and put together the package, summing or kegs does not design my build, that the only reason MK was mentioned as he was supposed to be much more then a person selling parts as summit or jegs does. I certainly didn't cheap out either I spent 35,000 in parts to build 540's new that's no labor, money was not the issue for valve springs at all.

Now if I called afr direct and said I was using the heads in a marine engine ad they sent that, I would replace the MK with AFR, just a thread for info no matter where guys get heads.

I was not aware that you could get isky tool room springs shipped and installed with the afr heads ..thats a good thing

Our buddy got afr 315 heads from Bob. Upgrade to inconel valves, and #8002 spring "upgrade", which are the cheaper PAC springs. They were for a 1000hp forced induction build.

I ordered my heads direct from AFR. If you tell them what spring pressures you need they will tell you if they have them. If what they have will not work you will have to supply your own.

I believe the springs where checked twice for pressures....ie: both times the heads came off.

If they weren't checked for coil bind , I would be shocked......but I'm not sure if that was mentioned anywhere.