twotone....Gottcha

spike, Thats exactly what I had in mind. Shelve the carb and go with fuel injection. Thanks, L8TER, Paul.

 

zz502 gets my vote.

 

I installed the ZZ4 with hot cam.

GM,s dyno test results are as follows:

Production ZZ4
356.1 HP @ 5250 RPM and 405.9 torque@3500 RPM

Hot cam and 1.6:1 Rockers
394.1 HP @ 5750 RPM and 417.3 torque@ 3500 RPM

The car is running in the high 13s @ 108 MPH with 3.08 gears at 4,300 feet.

However, if I had it to do over I wwould try the LS1

:yesnod:

 

Will this set up fit under the stock hood?

Thanks

 

The zz4 will fit with a drop base air cleaner. Additionally, might want to watch where you post this thread is from 2002.

 

I'm thinking about putting a crate motor in my '71 350/270.

I want it to look stock, at a casual glance.

Can I use the stock exhaust manifolds with the ZZ4?

Thanks

 

For some reason my ZZ4 installation FAQ that used to be on the forum is gone.
EDIT - Just saw the sticky with all the old tech articles. Here is my ZZ4 FAQ:

ZZ4 Install FAQ


You can use the stock manifolds but ZZ4's exhaust ports are D shaped and if I remember correctly they sit a little higher than original stock heads meaning you might have to massage the pipes up a bit to get them connected. Personally I would just go with headers.
My ZZ4 fits under the base model hood with a q-jet and the stock dual snorkel air filter box. One other thing is you have to grind down one of the timing chain cover bolts to get the water pump to fit. It's not that bad just test fit until enough material is removed. THe other thing is it came with a auto trans flexplate so I had to get a flywheel that worked with the ZZ4 as it's externally balanced. Other than that it's pretty much plug and play.
I like my ZZ4, good bang for the buck at the time (2001 is when I installed it and it was $3700 with the headers and a flywheel).

Now for the bad news. The ZZ4 is discontinued. The good news is GM makes a ZZ6. Not sure it will fit under the hood though.

My ZZ4:



Link to ZZ6 base engine specs


At the time when I installed my ZZ4 a few people were doing the LS1 swap out of donor cars as there were no LSx crate motors at that time. Today you can get a LSx crate motor and if I had to do an engine swap today that is the direction I'd go.


And I don't get why people bitch about old threads. Is the information not applicable today? It isn't like 2002 was the dark ages or anything.

 

Thanks for the detailed post, exactly the type of info I was looking for.

Can you comment on the ZZ4's idle quality and street manners?

Will it idle as smoothly as my stock 350/270?

Thanks

 

http://www.crateenginedepot.com/Chev...ines-C944.aspx

 

ZZ4 has a little lump too it but not too bad. Street manners are great.

 

There are so many too choose from! From 355 to 383.... Take your pick!

 

If it was me, I would go for a 450 Gross HP 383...great HP/Torque without the added bulk of a BB in a C#.

Now if you are a HP junkie, the ZZ502 BB......................

 

first, best for you? no clue.
money?
power?
lasting?
ask yourself
where in an rpm range you want power
how much power
be careful
wanting a little more than you got can end in an expensive dissapointment
look at how you drive now and use that to ask how to get power

 

I want it to look stock, at a casual glance.

Will be using the stock exhaust.

Engine will be mated to a 5-speed. (possibly 6-speed).

No lumpy cam or loud exhaust.

Thanks

 

That stock exhaust might choke that new engine down. These new engines flow quite nicely so at least run shortys.

 

I'd have a hard time staying away from a ZZ-BB of some size at this point.

 

This makes me fizz:
http://www.chevrolet.com/performance...s/zz6-turn-key

Nice engine! But pricey!
Other brands are cheaper!

 

I put a Chevy Performance ZZ383 crate motor in my '73 coupe. Wow 425hp/465lb-ft nice streetable motor. I had a Demon carb with headers and a big block under car stock exhaust. This was a great combination and ran on pump gas with no problems.

 

 

Bingo...that is the crate I would go with or similar if I needed to replace my engine. My OEM L-82 355 with 10.2 Compression, roller cam, and AFR heads is a monster with 450+ Gross HP and BIG mid range torque and a joy to drive now as well...shocking with a 355 no less