3.4 head swap

[95v6camaro]

i have a 95 3.4 camaro and i wanted to swap out the old set of heads for a set of the higher compression aluminum gen 3 heads off of a 3100 or 3400 sfi, i am hoping they will bolt up but im not too sure does anyone know if they will?

[geoffinbc]

They will bolt to the block. But your intake will not bolt to the heads. You will have to use the whole 3400 top end. But your injectors will plug into the 3400 fuel rail. So all you will need to do is come up with a bit of custom wiring, hoses, brackets, fuel lines, EGR system and some other do dads I cant think of right now.

[95v6camaro]

all right then sounds like my camaro is getting a new top end, unless is the theory of people doing this compression ratios running upwards of 12:1 and higher are true because i do need this for a daily driver/ weekend racer.

[geoffinbc]

Oh yes for sure the compression will jup up big time. You will have to run premium gas.

[Corpse]

I don't know what was used for pistons in that year but, I know that some engines with the dished pistons will have high compression that will run off pump gas. But, if you have flattop pistons I would assume the compression could be too crazy to use pump gas.

I have dished 3.1 RWD-style pistons with Gen III 3x00 heads and the compression is figured to be a little over 11:1.

If you get the 2000+ intake setup you should defenitely notice a difference over what it was before.

-Dave

[StudlyCamaro]

Oh yes for sure the compression will jup up big time. You will have to run premium gas.

has anyone actually taken the a 3X00 top end and used it with flat top pistons and ran it on premium gas??.. i know the idea has been discussed ... but has anyone proved this to be possible?

[geoffinbc]

Good question. I dont really know. 3.4L pistons do have a slight dish in them but no eve close to the dish of an aluminum head engine.

[StudlyCamaro]

because with all this discussion im thinkin about just throwing the 3400 top end on my car and calling it done for a while if i can get away with running 93 octane

yes the 3.4L has a small dish on the pistons .. it appears to be around 6CM in diameter, and about a MM deep which is a 2.82 CC dish approximatley

[geoffinbc]

7cc dish versus about 26cc for alum head

[StudlyCamaro]

thats a 7CC dish. damn my gheto measurements were way off then... or maybe it was my math.. (i havnt had to calculate a volume in a few years)


anyone have any thoughts on using a copper head gasket to reduce the CR ???

[Corpse]

I guess you should be ok, possibly. It seems like a bit of risk but, I would assume it may run on 93-94 octane.

-Dave

[DarkKnight]

You could try opening up the combustion chamber on your heads a bit, that should drop your CR enough to run pump gas.

[StudlyCamaro]

i personally wouldnt wanna screw too much with the bowls on the heads too much, they have a pretty heart design that is great for the ole tumble and swirl

[Corpse]

Yes but, they do have some areas that could be a potential hot spot. But, unless you really know what you are doing, it is better off left alone.

-Dave

[geoffinbc]

Plus if you tried to do it by hand there is no way inhell you wil get them all exactally the same. Might get 1 chamber with 10:1 and another with 11:1