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Engine mods and passing pits

Hello all,
I have 2 questions for you. My engine goes into the mechanics on monday to start getting rebuilt. Now the guy who im taking it to said to change my crank and rods and take the 327 out to a 350. What do you people think of the idea. do i stay with the 327 or go the 350.
My other question is for the guys based in perth. Dave might know as he is doing a lot of mods on his car at the moment but if anyone else can answer i would appreciate it. I was just on the website for the dpi (department for planning and infrastructure) and found a pdf file to download. Its 9 pages. It is a "Vehicle Modification Application for production vehicles". Just wondering if this does have to be filled out. Im looking at calling up pits this week but just thought i would ask here first. Last time i called pits was approx 6-8 months ago and they never mentioned any application forms. It goes into so much detail even as far have the original seats been changed raised lowered etc and please explain why these changes occurred. Bloody hell. Any info would be great.
Thanks all in advance
Regards
Matty

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ive found with the guys at the pits that everyone you talk to has a different idea of what has to be done. a few months i went to get the my ute inspected for an engine change from a 6 to a 253. pretty simple change i thought... asked 4 people at the welshpool center (1 guy in the office and 3 inspectors) what i needed to do and they all said something different ranging from full inspection to a change of engine number form.

in the end there was a problem with the chassis number (when it was first registered the number of the australian standard or whatever it complies with was recorded instead of the chassis number), anyway in the end the guy fixed all the papers including, the new engine, without checking anything.

so anyway to get to the point i think it very much depends on who ends up looking at your car as to what they think you need.... like the rest of the public service most of them seem to have no ideas whats going on!

neil

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Hey neil,
Thanks for your comments. Well its a bit of a catch 22 situation. Just spoke to a guy called Lee at the welshpool pits and he said that as long as the capacity and horsepower does not exceed a maximum of 25% from the largest available motor (we went by a 308) it will be passed under self-modification and does not need to be engineer certified. So as far as cubes im fine. Just out of curiosity did the Kingswood SL sedans come out standard with a 350 or did they only come out with a 350 in the gts monaro. Im just worried about the horsepower. He also said that the motor has to be standard so no modifications of cam shafts or anything. But they wont know whats inside the motor when its all bolted up together right. So this brings me to my next question. Does anyone know or where i can find the horsepower ratings of both a standard 308 and standard 327/350.
Thanks
Regards
Matty

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Matty

if ya want more inches, stroke it

If it's any help Matt, according to the GMH HQ workshop manuals I have it lists the 308 as having 240hp @ 4800rpm and the 350 has 275hp @ 4800rpm, unfortunately the manual doesn't mention the 327 as this wasn't available in the HQ series. I also made enquiries with the DPI about engine swaps and I was told that as long as the power of the replacemnt engine doesn't exceed the power of the engine originally fitted to the car by more than 25% then a certificate isn't required.

I totally agree that you never seem to get the same straight answer from two people when dealing with the vehicle licensing branch.

Hope this helps.

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Hi Matty,

327's only came out in HK Holdens. 350's were available in HT, HG, HQ and HJ but I read somewhere that no 350 HJ's were actually produced. For HX and HZ, 308 was the biggest motor available.

Basically, the pit guys cannot know what is inside your motor...so long as it idles smoothly and has stock externals (carby, manifolds and exhaust) I don't think they can pick it.

I would recommend talking to the engineer who is going to do the Qute (and a mate's hotrod). His name is Rod Styles and he lives in the Belmont/Cloverdale area. As well as engineering approvals for modified vehicles he also does scrutineering for the HQ racers in WA and travels the State doing major accident reconstructions to find out if something broke on the car/truck/whatever or whether the driver was at fault...he knows a bit about this stuff! I don't have his number handy but he is in the phonebook.

After talking to him, I decided to change a couple of things I was going to do to the Qute. He is quite easy to talk to and will give you a straight answer.

He told my mate with the hotrod that he would go to the pits when Paul takes his hotrod for licencing as he (Rod) can argue with the guys at the pits but the owner can't! I reckon that's an excellent offer!

HTH...Dave

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Cheers...Dave

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Qute's Shed

hi matty my names jason I own a 308 powered monaro,and I've got the original owners manual in my hand.to answer your question on standard displacement of a 308, it was rated at 240 hp@4800rpm, the 350 standard was rated at 275 hp@4800rpm also. I have no figure for the 327 because it never came out in the hq series. Just an answer to your other question about which motor to choose. I have had wide debates about which is the better engine,the 327 or the 350 chev, and everybody has told me that even though the 350 is a bigger engine, the 327 is much stronger and is torquer than the 350.

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Standard output of the 327 in the hk monaro was 240 hp and the 350 output in the HQ 350 was 275/300

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Hi Matty

I spoke to my local inspection guy down here in the south west a few months ago, first thing he did was hand me one of them Vehicle Modification Application forms, he said you fill it out, send it to the DPI, then they either approve or disapprove the mod, or it may say it will be approved if certain modifications are done to your car (that may mean suspension, brakes etc etc). Then if you get the approval you fit the engine and then take it to be inspected, this is done to make sure it is fitted correct and to make sure all safety precautions have been followed and the car is safe for you and everyone else on the road.

HTH....Shane

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Hey rat,
Yeah these forms mate i dont know. The guy from pits never mentioned any forms so i dont think im gonna worry about it.
As for the guys giving the info on the power ratings on the engine thanks heaps. I managed to find a website that had the power ratings on it. So as far as that goes im fine as well by the looks of things. I think im gonna stick with the 327. I've heard a lot of good things about these motors (not saying theres anythng wrong with a 350), but cause ive also been wanting one before i even had my license. Im not that old though. I emailed a place called chev power in maddington here in perth asking them the power rating of a 327 and hopefully they will get back to me with the news i want to here.
Once again thanks to all who helped me with my questions. Very much appreciated. I shouldnt have any problems as long as my cam isnt to lumpy when i go to take it over pits. She'll be right.
BTW: does anyone know of anyone personally down at any of the pits. Just to make it a little easier getting the car passed.
Thanks all again
Regards
Matty

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Matty

if ya want more inches, stroke it

I was "told" (i.e. one opinion of many)
that a 6 -> 8 conversion was costly, but a v8 to a larger v8 was pretty simple, just change the engine or whatever over and fill out a modified engine form for the rego and notify your rego.

As far as 327 -> 350 i think that would be a good idea, IIRC the only real differenceis the increase in stroke lenght.
you might even be able to get the high compression pistons/heads too, the 10.25:1 used on the earlier manual GTS350's.

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