new Q, doing 3x00 hybrid, need advice, please read

[sil]

ok, i have a few questions regarding the 3x00 hybrid swap onto my 2.8 block.

edit:red=answered
edit:green=new question
[1] is the 2.8 piston height different that 3x00 piston hieght
yes, but it does not protrude out past the deck height of the block
[1a]if i put the head on, am i going to have to worry about my lift
im running a edit 440 lift edit

[2] can i use the copper "older style" .040 head gaskets(compared to gen2/3 .060) with my set up?
id really like the increase in compression
yes, it will raise your compression ratio aprox .3 to .4
[3] im going to put the 3x00 1.6 roller rockers on
[3a] are the rockers adjustable?
no, adjustment are made with pushrod lenght
[3b] and do i have to worry about pushrod lenght?
your adjustments are made at the pushrod, measurment is critical fop proper preload

[4]how do i measure my pushrod lenght to get proper preload?

thanks in advance

[farmerz24]

RE: doing 3x00 hybrid, need advice, please read, multiple Q

the height is different i believe. the 3x00 is dished, the 2.8 is flat top. i have a set of 2.8 pistons and rods for another $20 if you want.
1a i dunno

2 you might be too high on the compression with this

3 the rockers will have to be adjusted by obtaining the proper pushrod length.


u will need different pushrods

see you tonight.

[treeZ24]

RE: doing 3x00 hybrid, need advice, please read, multiple Q

if its an aluminum head 2.8 the pistons arent flat, they are dished, however they dont extend above the deck where as the 3100 piston are again dished and DO stick approx .020" above the deck

[TurboGTU]

RE: doing 3x00 hybrid, need advice, please read, multiple Q

Yes. Nothing to get your panies in a bunch though.
No..is this with the 1.6 rocker? If for a 1.5..the you need to check for the 1.6 since it will be in the .480 nighborhood.

yes.
OK
No
Yes.

Don't forget to prime the whole engine before starting it up with the new cam.

[sil]

im running a 440 lift crane cam 16-233-4
and im going to put the 1.6 ratio rockers on

what is the calculation to get the sum of total lift ?

how do i measure my pushrod lenght to get proper preload ?
are there any good guides on this ?

[bszopi]

To figure out total lift, you'll need the lift of the cam at the lobe. Then, take that value and multiply it by 1.6. I'm gonna guess that with the cam you are spec'ing (440 lift) its using stock 1.5 rockers. 0.440"/1.5*1.6=0.469" at the valve.

To measure for proper pushrod length, you need a checking pushrod. Crower is the only company I have found that carries one short enough for our engines. I probably posted the PN for it on here before. Do a search and you'll find it. As far as the procedure...

http://www.60degreev6.com/GPXSS/pushrodchecking.html

[TurboGTU]

how do i measure my pushrod lenght to get proper preload?

http:/www.60degreev6.com/GPXSS/pushrodchecking.html

But I like step 2 to be changed to : Turn the engine over till the Exhaust valve/lobe of the cylinder your working on is fully open. Now messure the intake side... This way...you are sure your not in the OVERLAP cam phase of the engine cycle.

BTW..thats a Comp Cam you have..not a Crane. It's the 260H. You still need to check the clarance of the piston to valve. Use some clay on the piston and slap her together with just that cylinders valvetrain setup (if you have a solid lifter..use it..if using the stock hydrolic..make sure to bleed it down and take up all the preload you can get till its bottome out.) and spin her with your hand to simulate a compleate engine cycle. If you feel it "Jam" stop. Now take it apart and look at the indentions on the clay. Mesure the hight from the surface of the piston to the top of the clay. That is your clarance. Ideal it should be a minimum clarance of .01 on the intake and .02 on the exhaust.