Ill keep this short as possible to save you guys the headache of reading. lol. So i had my stroker built by a local machine shop about 4 months ago now i guess. Due to lack of communication on his part and me getting frustrated with that and the over all build not going how i had hoped it would i just had him put it together so i could get it back. I am running a 0331 head from clearwater cylinder heads and a new factory cam and a compression ratio of 9.5 scr ( forgot the DCR) anyways i had an 0630 head and bought the 0331 cuz that head had been overheated and needed rebuilt etc
So here is my thought I want another 0630 head and an aftermarket header and a higher lift cam. i can get around the california emmisions on the jeep now i found out so that changed everything dramatically. the goal isnt more power the goal is to bleed of some of this excess compression. And improve the overall efficiency. Is it worth swapping out this head or can it perform as well as a 0630? I have read TONS of conflicting info on this. Let me know some thoughts and if im just overthinking this or not.
Do you have a build sheet of all the stuff your machist did to the engine? valve grinding? oversized valves? oversized bore? port and polish? What about any of the bolt on performace upgrades? newer intake? bored out TB? multi port injectors?
Are you having to run high test? Do you run either a MAP adjuster or FPR? Both?
As for the head, i have also read conflicting information, but it does seem, at least to me, that the 7120 head gives the best flow and reliability. The 0630 head may have slightly higher flow charts, but i dont think its pretty much negligable, but i honestly dont know for sure. FWIW i am/will be running the 7120 head.
As for "bleeding" off some compression, not sure how you would do that without more machining.
ftpiercecracker1 wrote:Do you have a build sheet of all the stuff your machist did to the engine? valve grinding? oversized valves? oversized bore? port and polish? What about any of the bolt on performace upgrades? newer intake? bored out TB? multi port injectors?
Are you having to run high test? Do you run either a MAP adjuster or FPR? Both?
As for the head, i have also read conflicting information, but it does seem, at least to me, that the 7120 head gives the best flow and reliability. The 0630 head may have slightly higher flow charts, but i dont think its pretty much negligable, but i honestly dont know for sure. FWIW i am/will be running the 7120 head.
As for "bleeding" off some compression, not sure how you would do that without more machining.
In short no. On the build sheet. Machine shop does good work but horrible communication. By bleeding of compression I'm talking about a better head and higher lift cam. Yes on the map adjuster
showtime3492 wrote:the goal isnt more power the goal is to bleed of some of this excess compression. And improve the overall efficiency. Is it worth swapping out this head or can it perform as well as a 0630? I have read TONS of conflicting info on this. Let me know some thoughts and if im just overthinking this or not.
I reckon you ARE overthinking this. It's not worth the expense swapping heads and you won't see any SOTP difference. The same goes for headers. If you already have the late model two-piece header, keep it and just improve the downpipe.
I also don't think it's worth swapping out the factory cam either. The performance difference with an aftermarket cam is too little to justify the cost of both the cam swap and upgrading valve springs/retainers. If you're having pinging problems, just retard the cam timing by 4 degrees (possible with a Cloyes timing set). Otherwise just leave well alone and enjoy what you have.
I was thinking that. I think I just have a grudge against this engine and the crap I went through to get it done made me not even want it. But I definitely need to do something with the down pipe since my 2000 with California emission had a low pinion 30 in the front and I swapped a high pinion in it and now the driveshaft is literally right beside the down pipe. That was also a cause for concern.
showtime3492 wrote:the goal isnt more power the goal is to bleed of some of this excess compression. And improve the overall efficiency. Is it worth swapping out this head or can it perform as well as a 0630? I have read TONS of conflicting info on this. Let me know some thoughts and if im just overthinking this or not.
I reckon you ARE overthinking this. It's not worth the expense swapping heads and you won't see any SOTP difference. The same goes for headers. If you already have the late model two-piece header, keep it and just improve the downpipe.
I also don't think it's worth swapping out the factory cam either. The performance difference with an aftermarket cam is too little to justify the cost of both the cam swap and upgrading valve springs/retainers. If you're having pinging problems, just retard the cam timing by 4 degrees (possible with a Cloyes timing set). Otherwise just leave well alone and enjoy what you have.
Would love to leave well enough alone but that's nearly impossible.. for me...
lol. So i had my stroker built by a local machine shop about 4 months ago now i guess. Due to lack of communication on his part and me getting frustrated with that and the over all build not going how i had hoped it would i just had him put it together so i could get it back. I am running a 0331 head from clearwater cylinder heads and a new factory cam and a compression ratio of 9.5 scr ( forgot the DCR) anyways i had an 0630 head and bought the 0331 cuz that head had been overheated and needed rebuilt etc
