Originally Posted by victtor
...why do alot off people dead against gm crate motors in some of the threads and fourms on the net ?
Because they haven't bothered to purchase and use one yet
I do quite a few Marine application build-ups. A lot of these people don't really know engines specifically - they just want performance and as much reliability as they can get.
The GM performance crate engines fill this need perfectly
I can't do a mild performance build up on a 'core' engine for the prices I can get a GM H.O., ZZ or simular engine for - period. And I get these boats back in the water under throttle quickly - like the owners want. The last two ZZ454's I ordered from Scroggins-Dickey cost me under $6k each - delivered to California!
The 'ZZ' engine you have is basically an Aluminum Headed version of the 454 H.O. engine.
It has the same Forged Crank, Rods and Pistons and is the newer Gen. VI block type.
The heads have the larger 2.19/1.88 valves and the later, non-adjustable, valve train components. You can easily retrofit the heads to 7/16" screw-in studs and aftermarket rocker systems if you want to in the future.
"what should i whatch outfor on this zz454 please give me some info"
The only area I do not run 'out-of-the-box' is the Oil system.
I would remove the pan, disassemble the oil pump (remove the pick-up screen and then the gear cover - leave the pump body attached to the main cap...) and check the Pressure Relief Spring to make sure it is the HP one - should have a 'green' paint stripe or mark - if not, order a #3876866 spring from your local dealer and install when you reassemble.
BUT, before you do that... the Oil Pick-up Screen is not welded to the base plate of the pump from the factory - it should be - so, reinstall the pump gear cover with a couple screws, install the pick-up screen just tight enough to stay in place with slight angle up (I'm assuming the engine is on a stand 'up-side-down' at this point...) and then reinstall the oil pan WITHOUT the pan gasket - this will push the screen down to the level it should be to allow proper clearance to the bottom of the pan with the gasket installed - NOTE: I usually push the oil screen down (toward the crank) just a hair more - @ 1/16~1/8" to give me the clearance I want to see. THEN - remove the couple of bolts you used to hold the gear cover to the pump and take the assembly (gear cover and screen) to the bench to tack weld the Pick-up Screen to the Oil Pump Gear Cover - make sure you didn't leave any parts in the cover - the pressure spring and parts should still be out on the bench at this point or they could be ruined by the heat of welding - although, you really shouldn't get the cover/screen assembly very hot just tacking the two together. The 'weld' shouldn't be longer than 3/8" - just run a 3/16~1/4" bead where the screen meets the cover...
Now reassemble the gear cover assembly with the correct spring, washer and pin and reinstall it on the Oil pump.
Also try to keep the oil temps down as much as you can. I almost always install a cooler. GM makes several adapters and has some systems available that can be adapted to your car. Don't overlook a trip to the wrecking yard to search the truck section for oil cooler radiators and adaptors on some of the BB applications that wind up there - I've found some nice pieces to base a system off of on 3/4~1 ton's with both Big and Small block chevy/GMC.
You shouldn't have to worry about the oil system much now...
The Cam (#24502611) in this engine is one of the 'Marine' style units and works quite well.
If you are looking for more output from the flow abilities of these heads on this unit I would recommend you consider installing the #12366543 cam, if you are looking for more performance in the upper RPM ranges with a GM part.
There are also many aftermarket dual pattern cams this engine would respond well to.
"Going to use small shot nitrous ,street strip car"
I've seen these engines run alot of hours even with power-adder systems on them - I don't forsee any problems for you if they are installed correctly.
Hope some of this helps - and other chime in