A few years back I picked up a 1996 Z28 M6. It's my second 1996 Z28 M6. The first was a bolt on car that I daily drove back when I was in college. well, I'm no longer in college (been 8 years or so) and now can afford to do what I wanted to do, which was a street/strip build.

Things seem to have changed, not a lot, but a bit, in the last 8 years. It seems cam designs have improved, and the used market has gotten noticeably cheaper, which has been good to me as I have started to compile parts.

As she sits, it's stock sans a K&N intake and a GM Hurst Shifter with pro 5.0 stick. I have purchased the following:

LS1 driveshaft
Subframe connectors
STB
AS&M Monoblad
GTP Ported LT4 intake Manifold
GTP Ported LT4 heads (with all the valvetrain)
GM 847 cam
Mezz EWP
AS&M 1 3/4 mid lengths; I'll be running at least one cat, maybe two
SLP Dual/Dual with a cutout before the axle hump

I have injectors with a higher flow rate as well, maybe 30#r's but I can't remember now.

Here's where I am looking for feedback. I've always wanted the 847 cam. It sounds awesome, make great power, etc. I'm just thinking it's not the right cam for what I will use it for. I'd say it's 85% street, 15% strip. I'd love to hit 11's, but it's not a necessity. I'm also in MA, and I do the inspection thing the right way (I don't pay for stickers and I keep it all legal). I realize going from two cats to one is not allowed, but at least I'll have one.

Here's how I'm thinking about the 847 cam. For an 85% street car, the power band is probably wrong. Then, from an inspection perspective, they seem to focus on volume of sound, which should be pretty mild with th emid lengths and dual/dual, but also the idle quality. I know how this cam sounds, and it's going to raise eyebrows, and I know I can raise the idle, but that also could raise a few eyebrows.

This leaves me with getting another off the shelf cam or getting a custom one done, as I understand the newer cam designs can make similar or better power with a better idle than a 15 year old cam can. I DO have the flow sheets for the heads, which could be beneficial.

I'd love some input from you guys, like I said, it's been a while. If there's any other info you guys would want let me know, and I will provide.

Thanks!
Brian

 

you've supplied enough info here for me to tell you call a custom cam grinder, LE, AI, whoever you'd like. Tell them what you just told us and they'll set you up. Id guess you'd want something around 223/230 on a little wider lsa for emissions. Some where around .565 lift both ways. Could probably even get away with some more duration.

 

Yep, Id go custom grind. You'd be much happier with the performance and street manners of the cam, if you did.

 

+1 ^^^^^^^^ call Lloyd

 

How does the inspection go in MA? Do you get sniffer checked in the tailpipe or do they simply look for codes stored in the ecm? If they look for codes stored you can get a tune which will "alter" what exactly will throw a code. If you get sniffed there's virtually no way you'll pass with a cam like that. It's too dirty.

 

Thanks. The heads have comp 1.6's as well so I'll have a bit of extra lift over the stock ratio.

They do two things in MA for inspection. Every year they do an OBDII plug in. Randomly they do a safety inspection. It works out to about every other year. The kicker is the shops can fail you simply for being too loud or being modified. Most have some level of tolerance on an older car for replacement part purposes, but if they want, they can fail you just because its modified. No sniffer.

On a setup like this, what kind of hp/tq will I pick up if I go 383? I have a high mile block I will be getting freshened up, so while it is out of the car I'm debating incurring the extra cost. Would the extra cubes change how someone like Lloyd grinds the cam?

Thanks guys!
Brian

 

Call Advanced Induction.

 

I have heard GREAT things about AI, but my main concern is that for something like a custom cam, which isn't the money maker their heads are (or their heads/cam packages are), is I hear it can take EXCRUCIATINGLY long to get the cam done. I don't know that I want to take a risk that my build gets delayed waiting for a cam.

 

Doesn't hurt to call them and ask what their current TAT is. Mine didn't take very long.

 

usually takes 2-3 weeks on most custom grind cams!

 

Welcome back fellow MA resident!

 

My LE cams always show up in a few days from the time I order them. I have been very very happy with Lloyds work and NOBODY beats his customer service. Seriously who else answers his phone at 10PM and will walk you through any questions you have.

 

Thanks man - we met a LONG time ago, before you were doing the turbo stuff, at Dean's old shop NEdyno in Worcester.......it was a long time ago. I missed driving the 6 speed and RWD.......though I did put together some fast 3800 cars

 

I would go with LE. He is a great guy to deal with.

 

The monoblade is a bit overkill especially since your keeping your emmisions. I've only been told by Loyd Elliot himself that sometimes it's a PIA to get a good idle with a monoblade and a N/A engine. Just sayin, don't know from experience.
Ditch the cam and go custom LE cam.

Good luck!

 

A lot of people seem to have trouble tuning monoblades. Bryan Herter did my dyno tune and had no issues with it.