Mission critycal or 4piston GSR head??
Fixing to get my gsr head CNC ported by either mission critycal or 4piston.
I would like to hear personal experiences with both (good or bad) and if anybody has done back to back testing on both of the heads. The build will be a 84mm bore x 89mm stroke 11.5:1 compression on a precision 67/66. Thanks in advance for the help
I would like to hear personal experiences with both (good or bad) and if anybody has done back to back testing on both of the heads. The build will be a 84mm bore x 89mm stroke 11.5:1 compression on a precision 67/66. Thanks in advance for the help
4piston gets my vote, I'm currently waiting for mine to arrive

Luke was great to deal with and was very quick to respond to me in regards to any questions and also right on point when it came to expected turn around time..
Initially I was planning on sending my head to MCP but the email response time was really slow, so much so my last email was showing pic's of a head I was inquiring about getting done and wanted to see if it was able to be used or not and by the time I got a response (almost 2 months) I already had bought another head and sent it off to 4piston and it was already on its way back before I got an email from MCP
My 2 cents and i maybe wrong but doesn't speedfactory's cars use 4piston for there cylinder head work? Seems to be working for em

Luke was great to deal with and was very quick to respond to me in regards to any questions and also right on point when it came to expected turn around time..
Initially I was planning on sending my head to MCP but the email response time was really slow, so much so my last email was showing pic's of a head I was inquiring about getting done and wanted to see if it was able to be used or not and by the time I got a response (almost 2 months) I already had bought another head and sent it off to 4piston and it was already on its way back before I got an email from MCP
My 2 cents and i maybe wrong but doesn't speedfactory's cars use 4piston for there cylinder head work? Seems to be working for em
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At the end of 2013 humble performance has the fastest car out of those 3 choices of cylinder heads and he has an entire 4piston motor. There's no one else that knows the amount of stuff that these guys know. Porting is one thing but setting up a cylinder head to work in a specific a application is different. 10k redline for 2 years with 575 lift cam is the best. I never worry about **** when I go to the track. Everyone will see the light eventually. Just give Luke or Josh a call
im currently in the same situation , i had to buy a new head just this week ,right before dyno found out my head was f**Ked ,i can thank steve from CCCylinderheads.com for that but this is for a all motor set up so i called up 4piston for questions , cool people i was happy with our talk , my plan was to sent my head to them but have a friend that told me to try out Mission critycal ( MCP ), and he show me a head he got got from them(SAuL) from my eyes it looks great well im need to make a decision by this week , i need a head asap
At the end of 2013 humble performance has the fastest car out of those 3 choices of cylinder heads and he has an entire 4piston motor. There's no one else that knows the amount of stuff that these guys know. Porting is one thing but setting up a cylinder head to work in a specific a application is different. 10k redline for 2 years with 575 lift cam is the best. I never worry about **** when I go to the track. Everyone will see the light eventually. Just give Luke or Josh a call
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