400 ci and still pass the sniffer??
Thread Starter
Junior Member
Joined: Jun 2007
Posts: 21
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From: Hatboro, PA
Car: 91 z28
Engine: 350
Transmission: auto :(
400 ci and still pass the sniffer??
I'm looking at going with a 400 from my local builder for my 91. Its still pretty much all stock. For the same price he said he would build me a 400 (406)
Do you guys think its still possible to pass emmissions with a somewhat tame 400? or can i go with more cam and just get a chip burnt? I would love to go more cam but worried about passing emmissions. Also, it was a 305 car....how do they do the emmissions on a car that was a 305 that is now a 350 or more????
Ed
Do you guys think its still possible to pass emmissions with a somewhat tame 400? or can i go with more cam and just get a chip burnt? I would love to go more cam but worried about passing emmissions. Also, it was a 305 car....how do they do the emmissions on a car that was a 305 that is now a 350 or more????
Ed
Member
Joined: Jul 2007
Posts: 295
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From: Lake Jackson Tx
Car: 91z,97ws6,98fb,87&90jeep,05 yz250
Engine: 5.0tpi,5.7LT4,5.7LS1,4.2I6,5.7TPI,1
Transmission: t5,4l60e,
Axle/Gears: 3.42
Re: 400 ci and still pass the sniffer??
my friends 89 did with a singel 3" cat, headers,chip and 454 tb in colorodo and they are strict up there. it was a 305 tbi
Joined: Sep 2004
Posts: 2,777
Likes: 7
From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: 400 ci and still pass the sniffer??
I beat CA emmisions back in 93 with a 90 firebird, originally 305 TBI. We used a 400 from a 76 Caprice and a 454 TBI. We passed easy.
CA emissions requires a visual inspect and a sniffer. We passed both easy because the guy who inspected didn't realize that the dipstick was on the wrong side!
CA emissions requires a visual inspect and a sniffer. We passed both easy because the guy who inspected didn't realize that the dipstick was on the wrong side!
Thread Starter
Junior Member
Joined: Jun 2007
Posts: 21
Likes: 0
From: Hatboro, PA
Car: 91 z28
Engine: 350
Transmission: auto :(
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: 400 ci and still pass the sniffer??
Other than the dipstick being on the wrong side, and the block having a two-piece rear main seal instead of one-piece (uses a different flywheel/flexplate), there really isnt a difference. If you have a competent computer tuner (which you should anyway if you're building a non-stock engine) you should have no trouble passing smog with a 400. Just do not tell the smog tech you changed engines, because legally you're not allowed to put an older engine or block into a newer car.
