3.4 gen1/3500 hybrid questions

[merlot566jka]

well ive had it with the boat anchors, and i may have just ruined another 3.4...so lets got to the questions on the 3500 heads on an iron head block

the block is zero decked with the oem 8cc pistons and bored .020 over

can i use the 3400 return style fuel rails?

what has to be done to align the pushrods, ive read the pr guides have to be modified or the older 3100 style have to be used?

because of the fact i will be having to measure out new pushrods, i would like to retain the adjustable rocker arms to make up for any variance in the pushrods, can i just tap the rocker studs holes and use the iron heads rocker studs and my comp 1.6 roller tipped rockers?

will my pushrods interfere with the lower intake manifold?

coolant lines, which one does what on the 3500? i am a service advisor for a cadillac dealer and have access to the fsm drawings, yet they are exploded views and i cannot trace out the diagrams based on flow...

what can i use for max lift on the ls6 springs?

do the valve stem seals have to be changed for the ls6 springs or will the oems work?

can i use my trueleo headers if i wallow out the bolt holes and port to match the 3500 d-port ex?

are the demenisons of the 3500 heads different than the iron heads? (for acc mounting brackets)

do i have to tap the heads for a coolant temp sensor?

what is the measured cc of the combstion chamber (BEN- i belive yove measured this, ive seen others guesses, but im not hot on guesses)


and my wife wanted to ask, will i need more hats for my new heads? (shes cute huh?)

[merlot566jka]

no one?

[ForcedFirebird]

well ive had it with the boat anchors, and i may have just ruined another 3.4...so lets got to the questions on the 3500 heads on an iron head block

the block is zero decked with the oem 8cc pistons and bored .020 over

can i use the 3400 return style fuel rails?

what has to be done to align the pushrods, ive read the pr guides have to be modified or the older 3100 style have to be used?

because of the fact i will be having to measure out new pushrods, i would like to retain the adjustable rocker arms to make up for any variance in the pushrods, can i just tap the rocker studs holes and use the iron heads rocker studs and my comp 1.6 roller tipped rockers?

will my pushrods interfere with the lower intake manifold?

coolant lines, which one does what on the 3500? i am a service advisor for a cadillac dealer and have access to the fsm drawings, yet they are exploded views and i cannot trace out the diagrams based on flow...

what can i use for max lift on the ls6 springs?

do the valve stem seals have to be changed for the ls6 springs or will the oems work?

can i use my trueleo headers if i wallow out the bolt holes and port to match the 3500 d-port ex?

are the demenisons of the 3500 heads different than the iron heads? (for acc mounting brackets)

do i have to tap the heads for a coolant temp sensor?

what is the measured cc of the combstion chamber (BEN- i belive yove measured this, ive seen others guesses, but im not hot on guesses)


and my wife wanted to ask, will i need more hats for my new heads? (shes cute huh?)

Questions I can answer for you since I am in the middle of this build...

Yes,

pushrod guides are needed for only early 3x00 heads, after that they wnet to non-adjustable roller-fulcrum rockers,

use 93-95 3x00 rockers, studs, pushrods and guides for later heads (I have a set of modded guides if you use 2000+ heads),

Iron head studs and rockers will bolt right into heads up to 2000,

not sure what you are asking,

LS6 springs have been measured for over .500 lift, but verify before final assy,

yes, 2.2 Cavalier seals is what I just bought,

if the primaries are 1 5/8" or larger, yes,

yes, but the 3.4 brackets need little moding to work,

depends on car/year, if 3.4 SFI, use the three wire sensor, one to send signal to the SFI and other to guage,

32.4,


yes, more hats a must.

[Superdave]

* you need 2.2L Cavalier Exhaust seals.. 12 of them for a 91 or 92 year engine.

[merlot566jka]

use 93-95 3x00 rockers, studs, pushrods and guides for later heads (I have a set of modded guides if you use 2000+ heads),

Iron head studs and rockers will bolt right into heads up to 2000,

not sure what you are asking,

LS6 springs have been measured for over .500 lift, but verify before final assy,

ok a few more questions on the ones ive quoted

are you saying that the 93-95 3X00 rockers, studs, pushrods and guides will bolt right onto the 3500 heads? can i use my comp rockers, wor will i be forced to go back to the stamped oems? not that the oems are all that bad, just mine are roller tips.
also on the above, you say to use the pushrods as well, are they the right length? i thought there was length differences?

iron head studs are rockers bolt to the heads up to 2000 heads, so are there differences in the 3100 and 3400 heads? i know there are the large port manifolds...are the heads different? of course the 3500s are entirely different, i know that much.

i thought using the large port manifolds, and possibly the 3500s, the pushrods rub on the lower (oil valley side) or the runners

on the ls6 springs, where can i get the down and dirty info on them? id like to run a high lift, medium duration cam, and i already have the ls6 springs, just wanna make sure i dont over cam based on the springs. is .525 too much? looking at around 218/227 duration and 112 lsa. (yes thats the ls1 gm hot cam specs)

and on a side note, where am i going to be if i go with the 3400 heads instead of the 3500? other than the CR, are the flow differences to such an extreme difference that its just wiser to go with the 3500 heads?

[ForcedFirebird]

* you need 2.2L Cavalier Exhaust seals.. 12 of them for a 91 or 92 year engine.

I went by part #, FelPro SS70816 .

[ForcedFirebird]

ok a few more questions on the ones ive quoted

are you saying that the 93-95 3X00 rockers, studs, pushrods and guides will bolt right onto the 3500 heads? can i use my comp rockers, wor will i be forced to go back to the stamped oems? not that the oems are all that bad, just mine are roller tips.
also on the above, you say to use the pushrods as well, are they the right length? i thought there was length differences?

No, I did not say they will bolt to 3500 heads. 93-95 heads used stamped rockers and the studs will work on heads up to 2002.

iron head studs are rockers bolt to the heads up to 2000 heads, so are there differences in the 3100 and 3400 heads? i know there are the large port manifolds...are the heads different? of course the 3500s are entirely different, i know that much.

Up to 2002 heads they will bolt to, large port started in 2000

i thought using the large port manifolds, and possibly the 3500s, the pushrods rub on the lower (oil valley side) or the runners

If you use stamped rockers, there is some clearance issues

on the ls6 springs, where can i get the down and dirty info on them? id like to run a high lift, medium duration cam, and i already have the ls6 springs, just wanna make sure i dont over cam based on the springs. is .525 too much? looking at around 218/227 duration and 112 lsa. (yes thats the ls1 gm hot cam specs)

Have a machine shop check for lift, but theoretically .500+ has been OK on some apps

and on a side note, where am i going to be if i go with the 3400 heads instead of the 3500? other than the CR, are the flow differences to such an extreme difference that its just wiser to go with the 3500 heads?

3500 heads flow better in stock form

3500 gasket on a 3400 head...



(now I have my own pic, Dave )

[merlot566jka]

gotcha... other than the combustion chamber size and the looks of the 3500 upper, i see no reason to use the 3500 heads! if the flow can be duplicated with the 3400s with some porting, why is everyone in a frenzy to get 3500 heads? did i miss something some where?

[sharkey]

because most people dont port heads themselves, the 3500 head swap is bolt on power for little money in comparison. now 3500 heads ported.....

[merlot566jka]

yeah i see what your saying, it sounds like the lt1 heads and intake compared to the lt4 heads and intake.... ive already got the large port 3400 heads and lim, i think ill start with those. and maybe a 3500 upper intake

[ForcedFirebird]

gotcha... other than the combustion chamber size and the looks of the 3500 upper, i see no reason to use the 3500 heads! if the flow can be duplicated with the 3400s with some porting, why is everyone in a frenzy to get 3500 heads? did i miss something some where?

Design. The difference between 3400 and 3500 heads isn't that far off from small port and large port. What's the big deal in getting large port? compare them in person, and you will see - some pics...

(3500 gaskets on 3400 heads)


3.1, 3400 and 3500 top end comparisons...

http://s158.photobucket.com/albums/t87/forcedfirebird/headpics/?start=all

[merlot566jka]

damned you, im gonna go to the jy tomorrow and get the 3500 mumbo jumbo

[zofo61]

Another convert.............a little tear just dropped with a faint "Amen" heard in the background.

[merlot566jka]

thats a negative on today folks. the salvage yards here who have the newer cars are all closed on weekends, wtf

[ForcedFirebird]

thats a negative on today folks. the salvage yards here who have the newer cars are all closed on weekends, wtf

car-parts.com have lots of motors .