Hi i was wondering if anyone can help me out
i have an ss torana and am fitting it with a 308, Aussie 4 speed.
this is what i have planned to do to the motor.
black motor block, all the usual, bore, hone, crank grind etc, ACL duralite pistons, VN heads, pacemaker extractors, redline maniflod, quadrajet (i'd love a single plane harrop with 45mm webers but i'm on a budget).
What camshaft would be the best for my application, the car will be 100% street driven, no drags,
whats the difference between 282, 284, 286, 288 camshafts? would i be best off with solid or hydraulic?
i am chasing around 350 hp, would standard rockers handle this? (it wasn't in my budget for rollers)
also is a 9 inch the only option? would a finespline banjo do the job if driven right?
or could i shorten a HZ salisbury disc brake rear to do the job?
any input or opinions would be greatly appreciated! cheers
308 Rebuild, Camshaft, Diff
Started by
_heppy_ss_76_
, Feb 16 2006 08:59 PM
11 replies to this topic
#2
_CHOPPER_
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Posted 16 February 2006 - 09:05 PM
350 HP 308 + M21 = Broken gearboxes. If you're chasing that much HP, I would be using roller rockers. If it's street only and you're a bit lazy, stick with a hydraulic cam. Only a 9" will last more than a week behind 350HP with a manual box.
#3
_TORANASS_
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Posted 16 February 2006 - 09:18 PM
like Chop said 350HP and ausie 4 speed and banjo = mushy gears and axles..
You can run standerd rockers with a decent hydrolic, altho rollers are the better option they are not needed.. the VN style heads are a good method to get decent HP from a 308.. For the street id use a hydrolic seen as your on a budget solids are far more expencive... Have you thought of a strocker maybe..
With the diff if you dont wana run a 9" go for a Borg Warner from a VN commodore... As for the Ausie box well all i can say if driven nicely it will be ok but the first sign of agression its crunchy crumbles. Use an Auto to keep the price down...
John
You can run standerd rockers with a decent hydrolic, altho rollers are the better option they are not needed.. the VN style heads are a good method to get decent HP from a 308.. For the street id use a hydrolic seen as your on a budget solids are far more expencive... Have you thought of a strocker maybe..
With the diff if you dont wana run a 9" go for a Borg Warner from a VN commodore... As for the Ausie box well all i can say if driven nicely it will be ok but the first sign of agression its crunchy crumbles. Use an Auto to keep the price down...
John
#4
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Posted 16 February 2006 - 09:32 PM
A properly modified Trimatic can easily handle the 350 HP you'd like to achieve. It would probably be the cheapest transmission option.
#5
Redslur
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Posted 17 February 2006 - 12:03 PM
If you go solid cam you will need rollers. Solid cams require adjustable tappets. (lots of fun adjusting). More money!
When fitting VN heads you will need the VN camshaft. They are slightly different to the standard red/black motor cam in grind. To get 350 HP you will need a stage 4 cam 286/8 duration or 240 @ 50 thou lift. The VN's do a stage 3/4 cam that is a very suitable street cam. Any bigger and you really need higher compression to get the benefit out of the cam. Like mentioned above, a stroker is the best option for a solid 350HP.
Good luck!
When fitting VN heads you will need the VN camshaft. They are slightly different to the standard red/black motor cam in grind. To get 350 HP you will need a stage 4 cam 286/8 duration or 240 @ 50 thou lift. The VN's do a stage 3/4 cam that is a very suitable street cam. Any bigger and you really need higher compression to get the benefit out of the cam. Like mentioned above, a stroker is the best option for a solid 350HP.
Good luck!
#6
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Posted 17 February 2006 - 12:12 PM
Not quite redslur, they are different but not the grind thats the problem, VN motors have different port alignments..eg: you might get a inlet lobe on an exhast valve if using the wrong cam..When fitting VN heads you will need the VN camshaft. They are slightly different to the standard red/black motor cam in grind.
John
#7
Redslur
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Posted 17 February 2006 - 12:24 PM
Torana SS
Yes I am aware of the offset. My mesasage may not have been clear there. What I meant and have experienced, is the grinds are different in the sense that a stage 3 VN cam would be more like a stage 3/4 red motor cam.
Cheers.
Yes I am aware of the offset. My mesasage may not have been clear there. What I meant and have experienced, is the grinds are different in the sense that a stage 3 VN cam would be more like a stage 3/4 red motor cam.
Cheers.
#8
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Posted 17 February 2006 - 12:45 PM
yep exactly mate i know what you meen about the grinds, Another thing to is with EFI it tends to smoothen the idle of a lumpy cam much more, so a cam with lobe separation of say 112deg will be smoother in a EFI setup compared to a carb..
John
John
#9
_MAWLER_
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Posted 17 February 2006 - 04:21 PM
If you are sticking with the standard stroke then VN heads will be a waste IMO. Sure, they will work o.k but they really come into their own when used with a stroker motor. VN heads have a larger inlet than exhaust whereas early model 308 heads are vice versa, so the motor may get bogged down. VN heads with lots of work done to them will cost you around $2500, perhaps you are better off taking the extra grand you will save with using old heads and putting that into a BW or 9 inch.
A Crane 286 hyd is a great street cam that makes good power and is the common choice for the sort of application you are talking about.
Just my opinion, up to you, more knowledgeable blokes will probably disprove what I'm saying anyway
Cheers,
A Crane 286 hyd is a great street cam that makes good power and is the common choice for the sort of application you are talking about.
Just my opinion, up to you, more knowledgeable blokes will probably disprove what I'm saying anyway
Cheers,
#10
micklx
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Posted 17 February 2006 - 10:23 PM
I agree, the Crane 286 makes good strong power to about 6000 RPM. I've currently got one in the racecar although will soon be upgrading to a bigger solid, but on the street they are a good cam.
#11
_Jewboy_
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Posted 17 February 2006 - 10:52 PM
I know with early heads that 0.500 lift is about max before spring bind occurs and spring bases will need to be machined. Has this been changed on VN style heads?
#12
_J&S Racing_
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Posted 17 February 2006 - 11:12 PM
I also agree on the Crane 286 choice, i have one in my street driven SS it pulls hard but i do run out of fuel at about 5000rpm but thats with a std fuel pump and lines (going to 3/8 lines and elec fuel pump). I am useing 3.0 diff ratio and a manual gear box, i can sit in top gear a lot and it will pull well drop it down a gear and your gone.
If your going to use VN heads as said stroke it to get the benifets from it.
If your going to use VN heads as said stroke it to get the benifets from it.
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