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[ZR1] MS90 registry: your wear data and experience
C6 Corvette ZR1 & Z06General info about GM’s Corvette Supercar, LS9 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
My AHP MS90 reworked heads with PSI 1511 springs. Only have 1000 miles on them so to soon to tell how guides are wearing. Street track. What has your experience with MS90 been so we can form some kind of data base. What cam and lift? Especially you guys who race! Who and How did you check your valve guide wear. Also you might have installed AHP preparatory PM guides. Interested in that info as well. Thanks Guys. (I don’t know why ZR1 prefix is shown)
Here is a write up Michael_D did a few years back on a set of our Moldstar90 heads he purchased off of a track vehicle that was doing sever duty type track sessions:
Here is a write up Michael_D did a few years back on a set of our Moldstar90 heads he purchased off of a track vehicle that was doing sever duty type track sessions:
Excellent story!!! Everyone needs to reads this if your concerned about
Fixing the guide issue. Hard to argue with cold facts!!! AHP- situation
Solved.
Excellent story!!! Everyone needs to reads this if your concerned about
Fixing the guide issue. Hard to argue with cold facts!!! AHP- situation
Solved.
There is a reason NASCAR engine builders use MS90 guides and PSI springs. For that reason and more, I chose AHP for working on my heads.
If anyone knows, its NASCAR and AHP. TI retainers included. At 6k miles my Engine valve train was making noise I didn’t like, and upon inspection by AHP one exhaust valve guide was way out of spec and three others were Borderline! Now, at idle my valve train is quiet, so quiet you can not compare IT to AHP head repair! My engine and exhaust is stock, and makes 500rwhp (mustang) with .020 milled heads and CAI. I didn’t mention the port and polish, engine flys to 7k!
Again I am not paid BY AHP when see something like this you want to recommend it. Hope this helps!
Good idea for a thread. I'd love to hear how their regular PM guides compare to the ones used by WCCH and their MS90 guides. I have the AHP heads with their PM guides. Hopefully I'm okay!
Good idea for a thread. I'd love to hear how their regular PM guides compare to the ones used by WCCH and their MS90 guides. I have the AHP heads with their PM guides. Hopefully I'm okay!
Interesting thread to come up now in light of the other current threads about bronze guides failing. Some folks are getting a little testy about it and one has to tread carefully when discussing this. I for one have been waiting to see wear results of the MS90 guides on Z06 heads for a while and prefer to hear results rather than get into debates about whether WCCH or AHP was in business first and stuff like that. I think a lot folks are dying to hear some real test results of the MS90 heads as the results are certainly pouring in on Bronze guides now that are not looking good. Others have told me to look up Facebook groups to show me how bad MS90 heads are, but I have not found anything yet. I would appreciate anyone directing me to links to show this. At this point anyway, I am still on the page of using AHP and Moldstar 90 guides for my fix.
There is a reason NASCAR engine builders use MS90 guides and PSI springs. For that reason and more, I chose AHP for working on my heads.
If anyone knows, its NASCAR and AHP. TI retainers included. At 6k miles my Engine valve train was making noise I didn’t like, and upon inspection by AHP one exhaust valve guide was way out of spec and three others were Borderline! Now, at idle my valve train is quiet, so quiet you can not compare IT to AHP head repair! My engine and exhaust is stock, and makes 500rwhp (mustang) with .020 milled heads and CAI. I didn’t mention the port and polish, engine flys to 7k!
Again I am not paid BY AHP when see something like this you want to recommend it. Hope this helps!
Again those are some nice numbers on a mustang dyno my friend.
Some info to add..
Some of the top GTR racing shops have also been using Moldstar 90 for their guides and valve seats. Glad we’re able to join the benifits this alloy brings. After hearing the testimony from the member here that tracks his Z, broke his ring land, rebuilt entire engine due to excessive track use. Rebuilt many other components because frankly he beats the brakes off the car, literally. I don’t kno how many pads and rotors he’s gone through but it was much more than normal use. However, the MS90 guides and heads were still in spec that came off his engine. Some solid news to hear.
I’m not paid by AHP either. I asked Kohle bout 200 hundred questions lol, and he didn’t hesitate to answer it all. Glad I was able to jump on the Moldstar train, I’m confident this should help or eliminate the “diseased” LS7 once and for all. Can’t wait for my street ported heads. This motor seems like a breeze to work on compared to a fully forged 03-04 (4) cam supercharged Terminator engine.
Again those are some nice numbers on a mustang dyno my friend.
Some info to add..
Some of the top GTR racing shops have also been using Moldstar 90 for their guides and valve seats. Glad we’re able to join the benifits this alloy brings. After hearing the testimony from the member here that tracks his Z, broke his ring land, rebuilt entire engine due to excessive track use. Rebuilt many other components because frankly he beats the brakes off the car, literally. I don’t kno how many pads and rotors he’s gone through but it was much more than normal use. However, the MS90 guides and heads were still in spec that came off his engine. Some solid news to hear.
I’m not paid by AHP either. I asked Kohle bout 200 hundred questions lol, and he didn’t hesitate to answer it all. Glad I was able to jump on the Moldstar train, I’m confident this should help or eliminate the “diseased” LS7 once and for all. Can’t wait for my street ported heads. This motor seems like a breeze to work on compared to a fully forged 03-04 (4) cam supercharged Terminator engine.
You will be amazed how quiet your motor will sound, and the Power!!
Good luck man!
I just found some more info on this topic - those of you who picked MS90 did well, I didn't. NBC is what MS90 is, although the specific mixture is proprietary. This is from Trick Titanium, about what to use with their titanium valves.
Non-Beryllium Copper Valve Guides
PVD Valve stem coatings are tough. Used with inferior valve guide materials they will literally “take out” the guides. Our NBC ONE material is the answer. The same toughness and thermal conductivity that make it great for seats also works for guides.
I just found some more info on this topic - those of you who picked MS90 did well, I didn't. NBC is what MS90 is, although the specific mixture is proprietary. This is from Trick Titanium, about what to use with their titanium valves.
Non-Beryllium Copper Valve Guides
PVD Valve stem coatings are tough. Used with inferior valve guide materials they will literally “take out” the guides. Our NBC ONE material is the answer. The same toughness and thermal conductivity that make it great for seats also works for guides.
I went AHP on my heads with MS90 guides as well. Car performed wonderfully and exceeded all my expectations with respect to the build and performance. The joy lasted less than 3k miles though. Half of them were on the drive back to Seattle from SoCal. I've searched and haven't been able to find any reported cases of MS90 guide failures but the guides in my heads failed. Inner bore became hour glass shaped on all guides and on the number 7 cylinder the exhaust valve galled up and bound in guide. Piston ended up kissing the valve bending it and knocking off the lash cap. Exhaust valves had been updated to Ferrea fortunately. Local shop recommended I go back to PM guides. Piston checked out also.
I went back to AHP and they took care of me. Redid my heads with new MS90 guides and replaced the damaged valve.
04-05-2018, 10:35 AM
MS90 registry: your wear data and experience
