gearhead3

Hello, I have a 97 camaro and I am putting a 383 in it. I have AFR LT4 heads with 2.08 intake valves and 8 to 1 comp and this motor must pass smog. The machine shop gave me a cam that is 112 CL 210/218, 499/525, 110/114. What would be the LSA? 114?

Also any suggestions on proper injector size as I would like to hit it right . I have been reading for two days on here. I have a P1 with an upgraded inpeller.

96capricemgr

You should have begun asking questions a lot sooner but too late now.

114 is the LSA

The problems with the setup go a LOT further than that.

mrmint69

I have 42lb in mine. Its more than I need, but it seems going bigger is always better and it doesn't hurt the driveability. There is a HP guide to follow and if your like me, you always plan on going bigger, this gives you that chance. What do you plan on making for HP? Sounds like you are still working on it and might make changes. Are you able to fix the problems you have now or is it to late?

gearhead3

What do you mean by problems? It is not in the car yet.

96capricemgr

The compression is at least a point too low even for boost, it is low enough that it will cause a poor burn and be a bigger emissions risk than the cam which is a full 10degrees+ too small on duration and needs at least a 1.7 rocker on the intake to make the lift vaguely appropriate.
The absurdly low compression will make it a dog off boost too.

The engine specs are like something out of 1982.
These days even an emissions blower build should be 9-9.5 or so compression and with the 383 the cam should probably still be at least up in the mid 220s maybe even more and the cam lift is a complete joke I think just about all the decent cams these days are at least .560s(you need 1.7s intake to get there) and a LOT of street stuff these days is even up in the .590-610 range.

That is all aside from my personal opinion about some of the parts being poorly choosen.
If you research I think you will find the stuff I posted above just about everyone with LT1 knowledge will agree with.

mrmint69

The compression had me a little confused also. You could do some searching on this site and find lots of info as far as what has works and whats recommended.

gearhead3

I'm sorry guys, I was off with the math. Went to the machine shop today and I am at 9:1 comp. Thank you for helping out.

He had me go with a 1.6 rocker on the intake and a 1.5 on the exhaust.

He said that the cam is a 112 LSA. He told me to find LSA you add the two lobe centers together and Divide by two. I need to keep this smog legal as I have said.

96capricemgr

Even for smog legal the cam is too small and using 1.5 rockers is still a joke, with modern springs it is no problem to run .550+ lift on a daily driver, to run less lift than that on a built blower with aftermarket heads still raises a BIG flag.

A LITTLE tiny bit of research before hand and I bet you could have had another 100hp for LESS money and kept it tailpipe legal.

gearhead3

I'm well aware of what is possible as I am not new to this. My cam in my 96 SS is 235/245, 629/599 112 LSA and it runs great.
My cam in my 68 is 276/284, 715/713, 111 LSA.

As I have said, I am looking to keep this smog legal as it is my wife's daily driver. It is my understanding that the smaller the LSA the less likely to pass smog. Is this true? Should I go to a 114 LSA and go higher on the lift? I would like to be higher on the lift as you suggest which is why I have asked the question before I put the motor in. They bought this cam for me without my approval but they have been on with every other motor I have built there which is five now. My 454 made 739.8 HP on pump gas. I would have to say they did a great job with cam selection and it is very streetable.

96capricemgr

With that little duration it would probably pass on a 110LSA.
As I said if the compression really is way down around 8:1 that is low enough to cause an inefficient burn and will be a much greater risk to a tailpipe test than the cam.
All my comments have been taking your emission compliance goal into account.

Shops that are genuinely good with old carbed stuff VERY often can't handle the injected stuff because there are a lot of myths that pull them the wrong way.

"runs great" means different things to different people, I have met a LOT of folks at the track who thought their car "ran great" till they lined up against a car that actually runs well. I have taken down sprayed LS cars with my NA little LT1 taxi. Those people WERE happy with their car's performance up till then.

TimChiaretto

My setup is similar to yours. I have AFR LT1 heads with 9:1 compression ratio with a Vortech supercharger. The cam in mine is bigger than yours (214/224 with about 0.600 lift) and it's pasted smog here in LA with no problem. If what you want is a mild car that's a very easy driver then you aren't doing as bad as some seem to feel but, yes, you could go with a bit more cam.

96capricemgr

Do you have any measured data to support your belief that your car works well?

95maroboi

i have a 220/230 555. 112 blower cam and i pass california smog no problem

gearhead3

Thank you Tim, What size injectors?

Purple Poncho

That is an AI blower cam which is essentially a copy of the Comp CC305. Should pass though. The CC305 is a 220-230 .544 lift and you can get it on a 112 or 114 IIRC.