one-72

Repowering time has come.Can I hear any comments about the gm 427/480hp . on researching i find conflicting statements on the cam specs and the horsepower output if you compare the Zl1 it uses the same components other than the block it only claims 430hp and somehow they tweeked the dyno chart to show it. what gives? Aluminum block is only a weight savings .Compare Summit to Jegs you will see the specs are different but the part no,s are the same Thanks.

qwank

The zz427 is a good engine, but you're paying for the 427 name plate. The zz454 and zz502 are much better deals

bashcraft

I have the zz502. You'll be happy with it.

gdh

My ZZ383 arrived a few hours ago, know a few ppl with the ZZ502 and they are very pleased with them.

flyeri

I think it was Car Craft that had an article on the ZZ454. After a couple break in runs on the Dyno with the recommended 4 degrees initial timing they increased the initial and brought the total advance up to 36 degrees. A bit bigger carb, can't remember what size, and they made 500-505 hp. Not too shabby.

qwank

be sure to make a thread with lots of pics

harris1507

A ZZ502 is the way to go, I would have the zl1, but I can't justify the cost next to the zz502, you can go on my youtube channel and see and hear my car, (LeMans Blue). You do need to change the oil pan, and I think the newer zz502's have a mech. Fuel boss. You can use regular pump gas with all the power you could ever use, unless you are racing. PM me if you want more info. Are you going to be racing or just daily driving and showing?

Harris1507 for the youtube vid's

Good luck keep us posted

http://forums.corvetteforum.com/c3-t...s-opinion.html
http://forums.corvetteforum.com/c3-t...-my-honda.html

harris1507

Double post, sorry

one-72

Thanks to all for the input checked out the video and went ahead with the 502/502 .m-22 behind it and 3.73 rears mounted in custom strange 9in. axle /w detroit locker .HAPPY HAPPY.

harris1507

I'm running 3.70 rear with a M-21, I could smoke the tires all day long. But it does run of of stream around 5500 rpm, you may want to up grade the cam, make sure you change the oil pan. This was done by PO



I pulled the engine and changed the oil pan

3JsVette

Just wait till you drive it.