im staying with n/a, i dont want to blow stuff up... and i want allitle extra compression, but i dont know how much i can have milled off before i have to mill my intake too... and how much would you recommend milling off stock heads, give me compression ratio and aprox hp gain if you can thanks!MSTANG said:big question is are you going to use boost or NOS & how much compression do you have or want?
well what would you recommend doing then?> i am only doing this becuase my head gasket went out...Michael Yount said:Remember - when you mill the heads, you reduce your piston to valve clearance by the same amount, and if you don't check it/change it, you change your rocker arm geometry with the stock length pushrods. Additionally, you change the relationship of the lower intake ports and bolt hole alignment to the ports and bolt holes on the head. If you go more than about .030", you'll likely have to mill the bottom of the intake or port match the intake/heads. You may also have to "oval" out the holes in the intake so they'll line up with the milled heads. So there are some other things to think about when you cut the heads.
im not going for significant gains, just doing what i can when i can. its just a good time to have just a tad taken off, i want whatever i can take off without having to worry about anything. maybe give me very minimal hp but i dont care, i dont want to mess anything up... im thinking probably .015.. will that even do anything for compression and hp? from waht i can tell springs look new like the roller rockers...Michael Yount said:First thing I'd do is talk to the machine shop. If they didn't mention the stuff that I did, I wouldn't let them work on my heads. If it were me, I'd just have them do a clean-up cut (not more than .010"-.020") -- to be sure they're level, and have them do the valve job, refresh guides and seals. How old are your springs; do they need replacing? With a minimal cut, you won't have to bother with checking anything mentioned before. If I wanted to significantly raise compression, I wouldn't do it with a head cut. I'd do it with the proper pistons.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?