austleadfoot

hi all,did the zz3/zz4 engines have that as the suffix code?and did the zz3 come with cast iron heads?

austleadfoot

or come as a short block?

Guest

ZZ3 was 99% identical to the ZZ4, including the aluminum heads. Both were / are offered as short-block assemblies, without the heads. If you found an iron-headed ZZ3, then someone has put them on there, someone other than GM.

austleadfoot

thanks for the info.so if the suffix code is zz3 ,then it would be a zz3?

ZZ3 Z28

The cylinder heads installed on my ZZ3 (10185072) H.O. 350 are cast aluminum heads with 58 cc chambers, angled plugs, screw in rocker studs, and D-shaped exhaust ports. The part # is 10185086 and are often referred to as Corvette heads.

FryeDaddy

iTrader: (1)

Anyone know a thread all about zz4 engines? I have one when I brought the car, but will be rebuilding it after saving up alot of money for parts.... Mainly I wanna know what works best with the engine and its a daily driver, so 400 hp is statisfy enough but also I notice when i did drove it heated alot

ZZ3 Z28

You have a Camaro now with a ZZ4 motor in it, right? And it is over heating or just getting too hot? The ECM controls when the fan turns on and on an '85 it might be around 220 degrees. I don't remember. There is a cooling issue FAQ I seen some where on this site a while back that explains a lot.

Check here https://www.thirdgen.org/faq

My ZZ3 ran hotter than I expected it to so I replaced the stock radiator with a Be-Cool dual core cross flow aluminum radiator. I also installed an aftermarket fan over ride circuit that helped some what but the temp fluctuated more. I experimented with several different thermostats but I don't remember what I eventually settled on, sorry. I'll have to check on that at some point. I have since purchased a Flex-a-lite 3,000 cfm dual electric fan, item #480, (big $$$) but it has not been installed yet. I think the factory stock fan just can not pull enough cfm to cool things off. Hopefully this will settle things once and for all.

I think when you get into the 400 hp+ plus range things get sketchy. What I mean by that is that daily driver stuff is not enough and you may need to go heavy duty rated or high performance rated equipment. For example, Be-Cool rads are rated at 400 hp, 700 hp, and 1,000 hp. Will a 400 hp rated rad be enough for your application or will you have to go to a 700 hp rated rad. These are the things you are going to have to look at. Remember, horse power is not cheap.

FryeDaddy

iTrader: (1)

It's getting too hot, and its carbed as well. The engine also from crate as I found in papers from previous owner, so the year 85' camaro doesnt have any impact. I was thinking about getting electric fan(s), and perhaps a cowl hood to ensure I have an cooler engine after I get the engine rebuilt. Yeah having the 400hp is pricey to have, but being a sleeper on the road is priceless (they will think its like stock 225hp original engine, but again will be suspicous of my rumble exhaust)

ZZ3 Z28

Yes, with my crate motor, '1986 Z28' means less at the auto store. I can get windshiled wipers at Auto Zone, but just about everyting else, hello local speed shop.

Heat is a problem for some reason. My ZZ3 was killing me on heat wild temp swings. A Be-Cool aluminum rad helped but didn't solve the problem. I think the problem was the original factory single electric cooling fan was absolutely inadequate. Even an Hayden automatice temp over ride switch couldn't keep up. This is the thing that pushed my Camaro off the street until I came up with a better solution, along with other grandiose plans that never panned out. But that is another story.

I have mentioned this on other messages but check out a Flex-a-lite #480 dual cooling fan. It's pricey, but I think this is going to solve my problem and with your car generating more horses, it may be the answer, too.

thebandit50187

my ZZ3 has ZZ3 on passenger side of the block, between the cylinder head mounting surface and water pump ports. also the block casting number is a non production casting number so searching in most casting number books or online searches wont help.

thebandit50187

my ZZ3 came with #113 casting numbers for the heads (standard corvette aluminum heads)

thebandit50187

the ZZ3 is basically a 1987-1989 Corvette Long block that has 9.8 to 1 compression, with a high performance camshaft, Forged crankshaft, carbureted intake and some say high nickel content 4 bolt main block.

a ZZ4 is basically a 1990-1991 Corvette Long block that up the compression to 10 to 1, and all the same goodie as the ZZ3 but the ZZ4 got LT4 springs