G'day,

I have recently re-built my Slant for my VC Valiant (similar to Dart) ute. The thing is, the results are somewhat dissapointing (no better than stock!). Admittedly this is my first attempt at a performance build of a slant but I would have expected more and can only put it down to two things... Cam and Torque Converter...?

So I throw it in your hands. I have ported the head. Honed the block (+.060) and replaced just about every nut and bolt, cam, bearings, ballanced, alligned rods and so on. The trans is Auto, torqueflite with 3000rpm stall converter.

The car at the moment, sounds great but has no go! The cam I have installed is from a local Aussie (so called chrysler expert) and was the biggest they had but I really think its a bit of a dog (I was pre-warned). It revs, but nothing down low.

Can someone suggest (hopefully with no hidden motive ) a good cam. It doesn't have to be ultra drivable but I do want some more poke!! Happy to change the converter if I have to and am currently looking to source a new Diff so they are no issue!

Some help would be great. The slant in Australia is a forgotten warrior!!

Cheers,

Andrew

By the way, the cam would need to be shipped to AUS!

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You Know it can't if it aint on a Slant!!

Tell us about your compression ratio and cam specifications. Also, what are you using for induction, exhaust and ignition?

The big thing with a longer duration cam is more compression. If you don't have a high enough compression ratio it will sound wicked and run like a 3 legged dog. You have to match the whole package. So let us know what you've got in detail and we'll sort it all out.

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Joshua

G'day,

Thanks for the very quick reply!

Induction is tripple 1 3/4" Su's which have been re-built and run good. Exhaust is through Pacemaker extractors (headers) then 2-1/2" exhaust and super flow muffler.

I'll be honest, I'm not sure about the Compression as this is a very recent build (first on the road this past fortnight) but will check it out later this week (when my mechanic is back from xmas). I would think 9.0:1??

Does that help?

Thanks a bunch!

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You Know it can't if it aint on a Slant!!

oh,

Ignition is electronic. Conversion kit from Aussie Dealer Pentastar Parts.

I am digging for my Cam specs now. I gave them to the guys to build my converter. so am looking for the original spec sheet!

Sorry for lack of detail...

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You Know it can't if it aint on a Slant!!

No problem. Get back to us on the compression and cam specs. It's really easy to end up with less compression than expected and needed.

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Joshua

the erson 270°/270° (220@050) .465 gross lift 111° LSA 107° ICA is a very good cam. I'd hop up the comp ratio to 9.5:1 static comp. With tripple SU's I wonder how bad is your cam specs right now, they have variable venturi,. they should do excellent work on low end without hurting top end. Are they in really good shape?

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

The SU's are in great shape so I wouldn't think they are the problem. The only thing I could do to improve them is add tunnel rams.

Thanks, and will be back tomorrow with the cam specs and Compression ratio.

Thanks again.

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You Know it can't if it aint on a Slant!!

You might need to look at the cam again too. But I would say re-examine what you did to the head - You can get way more compression by Milling the block and the Head .100" (heck for valve to Piston clearance) Also, You didn't mention the vales at all - Try putting some bigger valves in - At the Smallest 1.7 / 1.44 - Some Folks go 1.8 / 1.5 - And the big valves will enable you to realise the port work and the SU induction.

Greg

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http://www.youtube.com/hyperpack

Thanks everyone for help so far!

I can't get the rest of the info until the new year as everyone is off on holidays but will gather that other info straight away.

The head work was reasonably extensive and by a very well regarded guy here in South Oz. So I hope he done the job right! I will check on the valve size, as well as the cam specs and compression..

Thanks again!!

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You Know it can't if it aint on a Slant!!

Get your hands on a compression tester (gauge) and do a compression test. Give us the readings, cylinder by cylinder, hopefully in PSI.
DD

it seems to me that everyone is focusing on your cam and compression but what is your gear ratio in your diff? That could be a problem if it is not low enough. you may need something like a 3.73 or 3.91....just my two cents...

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it's like a vw, sounds like a million miles an hour but goes really slow. (for now)

OK,

I have got some details of the Cam. No Compression Results yet but this may give you some idea of whether it looks like a dog or not..

Duration - Intake 287/Exhaust 287
50Thou - Intake 243/Exhaust 240
Centre Line Lift -Intake 113/Exhaust 111
Valve Lift - Intake 481/Exhaust 478
Valve Clearance - 15 Thou/18Thou

The Stall Converter I am running is a 3000 stall (advertised) but its stalling more around the 3200 mark.

Does this help at all?

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You Know it can't if it aint on a Slant!!

That's quite a lot of duration. I would expect you'd want a 10:1 compression ratio or better. Probably time to mill the head. A lot. But first, let's get some cranking compression numbers!

I should add that it looks like that cam is ground a bit retarded. I would use offset bushings and advance the cam. Dart270 will probably be able to give guidance on a good installed intake centerline. Probably around 102°.

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Joshua

That is a big cam.
You may want to advance the cam timing which will move the power down in your RPM's. Higher compression if you find you are below 10:1. I personally would check the piston to valve clearence after the change.

You can advance the cam timing 2 ways that I know of:
1) Get a big block timing advance kit. Consists of offset keys
2) Get an adjustable timing set. I believe these are made in Australia so that may be easy.

Good luck and keep us posted.

G'day,

It could very well have a similar compression. Will test as soon as I can.

To answer an earlier reply the Diff is Standard (3.23:1) and I relise this will need to change but I wouldn't think this would have as dramatic an impact as what is happening (the car has next to no get up and go/ its just like a standard engine).

Thanks to everyone so far!

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You Know it can't if it aint on a Slant!!