Emission Comp 400 Hp 355
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Teching In
Joined: Jul 2006
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Emission Comp 400 Hp 355 Just wondering what i needed too make 400rwhp out of a 355 and still pass emissions? I was looking into the LE2 package with 1.5 cam but i don't know if it will pass emissions. I also want it all motor, so no power adders. I wanna build a good 355 so it will pretty much be forged ,Im thinking of going with Callies for the internals. Well any suggestions and help on the build of motor would be nice!
Passing a sniffer or plugin are very different from being truely compliant.
You did not offer the year of your car or a state where the testing/inspection will be done so we have no idea what standards you need to meet.
You did not offer the year of your car or a state where the testing/inspection will be done so we have no idea what standards you need to meet.
If its an OBDII and you have a lazy tech that doesnt really do visual it would be easy. Thats what I do.
If its a sniffer car. I have seen a hot cammed and ported stock castings car make 390whp and those hotcams usually pass the sniffer, If they are being run with cats (set up correctly)
Id say a small custom grind (for that little extra hp) and be sure to tell the grinder your looking to pass the sniffer and then some AI heads.
If its a sniffer car. I have seen a hot cammed and ported stock castings car make 390whp and those hotcams usually pass the sniffer, If they are being run with cats (set up correctly)
Id say a small custom grind (for that little extra hp) and be sure to tell the grinder your looking to pass the sniffer and then some AI heads.
There is an LE1 emissions cam available from Lloyd. Some have passed with the regular LE1 and hot cams but the pass line is thin and good tune is required. The LE1.5 has a good bit more lift than the LE1 cam and would probably never pass any emissions test.
You goal is difficult but attainable with all the bolt ons if you are NA.
You goal is difficult but attainable with all the bolt ons if you are NA.
Thread Starter
Teching In
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Its a 95 formula, so its obd-I right now as it sits it has pacesetter longtubes emisson comp, off-road y-pipe, with the slp loud mouth exhaust, it has msd wires,blaster coil,and cap. its also ram air...ws6 clone! Pretty much it has no cats so i no it won't pass the visual part!
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Teching In
Joined: Jul 2006
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im going too buy some high flows for it, so that part is covered. Just needed too get a good combination for a 355, i really don't wanna go too crazy with getting aftermarket heads! Im going too get the stock ones ported
Its a 95 formula, so its obd-I right now as it sits it has pacesetter longtubes emisson comp, off-road y-pipe, with the slp loud mouth exhaust, it has msd wires,blaster coil,and cap. its also ram air...ws6 clone! Pretty much it has no cats so i no it won't pass the visual part!
Ported stock heads are the right choice if you choose the right porter.
Staging Lane
Joined: Mar 2007
Posts: 82
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From: NJ
Mine was built to pass a sniffer test in NJ using Lloyds recommendations. I retained ALL of the emission equipment down to the air pump and EGR. It made the power in my sig with the stock air box with 800 miles on the fresh engine. I'll put it to the emssions test in Jan. The torque curve is very flat. HP peaks at 6150.
On The Tree
Joined: Apr 2007
Posts: 118
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From: Southern Maryland
One idea is to keep your stock crankshaft for this 355. It really seems like a very good crank, (the stock GM).
Another suggestion is to use the Mahle piston (Power-pak) #SBC250030F05 with your favorite 6" rod and have the stock crankshaft balanced to that (with your stock flexplate/flywheel). That would make a reliable 355LT1 bottom end with forged pistons/rods and a pretty good stock crankshaft.
Karl
check AI, they have a rotating assembly that uses the stock crank and callies 6" rods. I know if I ever did a 355 that wasnt for boost Its what I'd run. Possibly upgrade the pistons If I was gonna run a ton of nirtous.
On The Tree
Joined: Mar 2007
Posts: 102
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From: Socal
Mine was built to pass a sniffer test in NJ using Lloyds recommendations. I retained ALL of the emission equipment down to the air pump and EGR. It made the power in my sig with the stock air box with 800 miles on the fresh engine. I'll put it to the emssions test in Jan. The torque curve is very flat. HP peaks at 6150.
Thread Starter
Teching In
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Yeah i was thinking about running it with nitrous, just haven't decide yet. Really just wanna build a good solid motor thats all. As for the long tubes well there emission comp pacesetter long tubes, all im missing is the cats on the car. Really the reason Im building the motor is cause i threw a bearing in the old one. is there a way too prevent that from happening on the next one? Also Im pretty sure i want it too be 4-bolt...the 2-bolt just worries me. I also live in Indiana, so if anyone has ever run any emissions around the NorthWestern part let me know how yah did.
On The Tree
Joined: Mar 2007
Posts: 102
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From: Socal
Yeah i was thinking about running it with nitrous, just haven't decide yet. Really just wanna build a good solid motor thats all. As for the long tubes well there emission comp pacesetter long tubes, all im missing is the cats on the car. Really the reason Im building the motor is cause i threw a bearing in the old one. is there a way too prevent that from happening on the next one? Also Im pretty sure i want it too be 4-bolt...the 2-bolt just worries me. I also live in Indiana, so if anyone has ever run any emissions around the NorthWestern part let me know how yah did.
Staging Lane
Joined: Mar 2007
Posts: 82
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From: NJ
LT's typcially aren't a problem in NJ as long as cats are in place and it passes the roller sniffer test. I used JetHots since EGR and Air can be retained.
