stroker and emissions

johnnyvista · Feb 2, 2004

I'm looking at replacing the shortblock in my 2000 GT with a 5.0 stroker shortblock. Does anyone out there have any knowledge of whether my car'll pass CA emissions as a stroker? What if i port the heads?

thanks!
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2000 GT
Bassani catted x-pipe
Mac cat-back exhaist
Mac cold air kit
FMS 70mm throttle body
BBK springs
Steeda underdrive pulleys
Pro 5.0 shifter

jeff1414 · Feb 2, 2004

I was wondering the same thing. I wonder if you just keep the stock heads with the stroker short block. So hopefully somebody knows if it will work in CA

VTEngines · Feb 2, 2004

The shortblock (unless drastic compression changes) will not effect emissions. However, cylinder head and camshaft upgrades will.

jeff1414 · Feb 2, 2004

Do you need a camshaft upgrade or can you just use all stock stuff.

VTEngines · Feb 2, 2004

Check out this month's 5.0 Magazine. We did a build up of a stroker for them using stock heads/cams, then also with our heads and cams. I read the article the other day, and it's very informative if you're considering stroking your engine.

johnnyvista · Feb 2, 2004

how much would i benefit from new cams (without upgrading/altering my intake or heads) along with my stroker? what cams should i use if in intend to stay N/A and want to pass emissions? thx!

bdcardinal · Feb 2, 2004

honestly i dont thing the stroker will affect emissions. i talked with a smog referee about stroking a 351 to 393 and he said that its not plainly visible. he would have to go to extraordinary lengths to find the correct engine size and no shop would do that. he also said the same thing about cams.

Beau · Feb 2, 2004

as long as your car will pass the sniffer, using a stroker kit won't be a problem. just don't tell the inspection station thats all. without looking into the engine they can't tell if its stock or not.

johnnyvista · Feb 2, 2004

my car's a 2000 so they hook the emissions equipment into the computer. no sniffer used. if my car's putting out exhaust like a 5.0 but the computer thinks it's a 4.6, will it trip the 'alarm'? also, how much will a hotter cam affect my emissions/hp increase?

Beau · Feb 2, 2004

i think as long as your computer says the exhaust is within the legal amount you'll be just fine. now when you get into more aggresive cams, you'll probably fail smog because they'll produce more emissions i think. but you'll gain more hp with a more aggresive cam..

johnnyvista · Feb 2, 2004

even if i use something like a stage 1 n/a cam?

Beau · Feb 2, 2004

i am planning on going with the stage 1 cam myself. and i was talking to the guys at JBA and they thought it would pass just fine.

VTEngine · Feb 2, 2004

when picking a camshaft to remain emissions legal, go with small .050 duration. This will assist in passing the sniffer test. Biggest problem with cam manufacturers is not being able to test for emissions (they vary so much state to state, etc.), so it's hard to say "yes it will pass for A, but not for B". Our stage1 cams "should" be able to pass emissions, but we've never tested.

Beau · Feb 2, 2004

VTEngine said:
when picking a camshaft to remain emissions legal, go with small .050 duration. This will assist in passing the sniffer test. Biggest problem with cam manufacturers is not being able to test for emissions (they vary so much state to state, etc.), so it's hard to say "yes it will pass for A, but not for B". Our stage1 cams "should" be able to pass emissions, but we've never tested.

so when staying with a camshaft like that, i.e. your stage 1 cams, how much hp can a naturally aspirated car expect to gain over the stock cams? In your opinion would stage 1 cams be a worthwhile mod for those of us here in california, with our draconian smog laws?

johnnyvista · Feb 2, 2004

my question exactly. thanks for all your help vt!

VTEngine · Feb 2, 2004

1990StangLX said:
so when staying with a camshaft like that, i.e. your stage 1 cams, how much hp can a naturally aspirated car expect to gain over the stock cams? In your opinion would stage 1 cams be a worthwhile mod for those of us here in california, with our draconian smog laws?

Definately a worth while mod if you're looking for more top end power. Our cams followed the stock cams till 4000rpm, then simply pulled away. They "should" be able to pass Cali emissions, but I honestly don't know for sure, and wouldn't be able to guarantee anything unfortunately.

Beau · Feb 2, 2004

VTEngine said:
Definately a worth while mod if you're looking for more top end power. Our cams followed the stock cams till 4000rpm, then simply pulled away. They "should" be able to pass Cali emissions, but I honestly don't know for sure, and wouldn't be able to guarantee anything unfortunately.

hey your word is good enough for me and if they don't pass smog straightaway, i'll find a way to get them to pass. i know some smog techs might like cuban cigars
thank you for your info and help. its pretty damn cool when a well respected company takes the time to help us new guys out.

VTEngine · Feb 2, 2004

1990StangLX said:
thank you for your info and help. its pretty damn cool when a well respected company takes the time to help us new guys out.

Not a problem man, I'm here to help and learn just like the rest of the people here. It's an expensive hobby, and if I can help people reach their goals and save some money by doing it right the first time, then bonus.

stallion98gt · Feb 2, 2004

VT

Beau · Feb 2, 2004

stallion98gt said:
VT

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