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Licensing for Chev LX - HP and Emissions

Started by _Ryno364_ , May 30 2016 10:17 PM

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5 replies to this topic

#1 _Ryno364_

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Posted 30 May 2016 - 10:17 PM

Hey guys, need a bit of advice.... I finally have my W.A. licensing centre approval paperwork for fitting the 350 Chev, Turbo 400, 9" etc and am currently at the stage where I need to purchase the engine to get this damn project on the road.

I'm torn between buying a relatively sedate crate motor (up to 330hp) which will be able to get me across the line by means of allowable horsepower (20% greater than what was available for a LX) and complying with the NCOP ADR27A vehicle emissions testing or putting in the 383 (around 420 to 450hp range) I ultimately want in the car. What has everyone else done to get their Torries across the line with regards to maximum hp and emissions testing acceptance? Do I put the crate motor in to get licensing done only to strip it down and replace most parts with heavier duty / flowing components or just put in a strong combo and fit a small / stock cam and carby (i.e. 650 vacuum secondaries) fitted? I've tried sourcing a stock motor as an interim but is it still a waste of $ considering it will be either on sold or have to rebuilt etc.

Any suggestions?

Cheers Ryan

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NCOP3_Section_LA_Engine_01jan2011_v3.pdf 217.82K 14 downloads

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#2 yel327

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Posted 31 May 2016 - 07:03 AM

You can get a 350 to pass ADR27A - far easier as a manual though as you don't need an EGR valve, but most Chevy manifolds including aftermarket ones come with provision for an EGR valve. ADR27A is essentially external to the engine so if you fit all the stuff an ADR27A 308 auto had including its carby and air cleaner it should be sufficient to show compliance, but talk to an Engineer. You'd have to fit the ADR27A switch to the TH400, screw a thermal switch into the back of the head, add the little vacuum electric switch on the manifold, two thermal switches at the front of the manifold, thermal flap in the LH exhaust manifold etc. Again ask an Engineer what they worry about, I had one tell me a while back that he wasn't all that concerned with ADR27A to the letter of the law anymore.

Early LX had a 250hp engine if that helps which means 300hp limit.

Edited by yel327, 31 May 2016 - 07:05 AM.

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#3 orangeLJ

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Posted 31 May 2016 - 10:19 AM

Curious, do they require proof of output?

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#4 _Bomber Watson_

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Posted 31 May 2016 - 10:44 AM

Just set the limiter to 3k on the dyno?

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#5 yel327

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Posted 31 May 2016 - 10:45 AM

Good question. I'm an Engineer (Electrical), and if it was an electrical "thing" I was certifying I'd look to factory GM documentation for output. So if you were allowed 300hp, I'd want you to show that it was essentially a copy of a 1968-69 L48. That is a flat top piston 350 with 64cc chamber fuelies with 165cc runners, GM general performance camshaft, dual plane intake manifold, Quadrajet, and similar dizzy timing. Or a 290hp crate engine. Or even certified dyno results for the actual engine. These hp ratings are SAE gross so the air cleaner, exhaust etc has no impact on the rating.