vk 6 to v8

[hg premier]

hi im looking a vk calias 3.3 and was wondering what i have to do to dump a v8 in it??

I here all this stuff bout egineering certificates and dont understand when one is acctually required???

i also have a hg premier which had a 202 in it when i got it and am looking to put a 350 chev or a vn ss motor. any ideas??

cheers

[jaywa]

Hey you don't need a mod plate or anything to put a 308 in a vk as they had them stock. The easiest way is to unbolt the K frame and all that then lift the body over the engine. Then reverse for fitting it. Drive shaft won't work either. The 202 had a longer one then the V8's. If you were up here i could sell you a V8 conversion but yeah. Easier to buy a crashed or rusted out one to change it all over from.

About the hg i think they have to be lifted out of the top cause the k frame is attached to the chassis, cheers

[ari666]

search function

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[GetToDaChopa]

Ari666 you forgot to mention...................... the "search" function

.... http://forums.justcommodores.com.au/...9&q=v8+into+vk

[bogan_vk]

you need to use the motor,box,tailshaft and the exaust from the v8 im pretty sure your supposed to use the v8 k frame the radiator is different from a 6 to an 8 youll also need to use the v8 brake booster/master cylinder (IF YOU WANT TO STOP) the speedo/tacho wont be accurate unless you change to a v8 one also the yolk on the diff is slightly smaller on a 6cyl as for wiring just lengthen a couple on your 6cyl loom and it will fire up thats about it its all easy just bolt it all in ..

[ari666]

you need to use the motor,box,tailshaft and the exaust from the v8

im pretty sure your supposed to use the v8 k frame the radiator is different from a 6 to an 8

youll also need to use the v8 brake booster/master cylinder (IF YOU WANT TO STOP) the speedo/tacho wont be accurate unless you change to a v8 one also the yolk on the diff is slightly smaller on a 6cyl as for wiring just lengthen a couple on your 6cyl loom and it will fire up thats about it its all easy just bolt it all in ..

there is no difference in v8 and 6 k-frame. the radiator is different but has nothing to do with the k frame as it sits on the rad support which is the same

speedo will be the same as long as you dont change your diff ratio, tacho will need to be switched to 8. i think there is a switch on the back of it, but am probably wrong.

the diff is totally different on the 6's, and the rear brakes are disc on 8's. but you should be able to get away with using the 6 for a while, till you get trigger happy with your accelerator and pop it. my mate was running a small salisbury with drums on his modded 8 just fine for a few thousand k's

if you have an efi VK6 then you will need to throw everything away from that. you will need to hook you alternator up to the battery, oil pressure wire to the oil pump, water temp to the sensor on the front of the inlet manifold, coil needs to be hooked up to ignition 'on' + and tacho to neg -, dizzy needs to be neg- and pos+ to the coil.

ok, im bored now

[NZVK308]

Use a VL K frame as it alows more sump clearance than early commy models.. the power steering rack mounts are 1/2 inch lower giving the sump clearance

[bogan_vk]

there is no difference in v8 and 6 k-frame. the radiator is different but has nothing to do with the k frame as it sits on the rad support which is the same

speedo will be the same as long as you dont change your diff ratio, tacho will need to be switched to 8. i think there is a switch on the back of it, but am probably wrong.

the diff is totally different on the 6's, and the rear brakes are disc on 8's. but you should be able to get away with using the 6 for a while, till you get trigger happy with your accelerator and pop it. my mate was running a small salisbury with drums on his modded 8 just fine for a few thousand k's

if you have an efi VK6 then you will need to throw everything away from that. you will need to hook you alternator up to the battery, oil pressure wire to the oil pump, water temp to the sensor on the front of the inlet manifold, coil needs to be hooked up to ignition 'on' + and tacho to neg -, dizzy needs to be neg- and pos+ to the coil.

ok, im bored now

you learn somethng new every day, i thought there was a difference as people advertise v8 k frames on ebay but when i converted a vh 6 to 8 i used the original 6 cyl k frame without a problem but thought i was cutting corners..

[ari666]

nope. as far as i know they are identical in every way. main differences are brakes, diff, and front suspension. the rest is plug and play

[greenfoam]

Are you guys sure the tailshaft is different? I would have thought trimatic to trimatic they would surely be the same

[ari666]

i am 100 per cent sure it is the same.

the only diff between 6 and 8 diffs is the size and innerds which i have no clues about. my mates tonner runs a 6 diff with an 8 engine and the tailshaft is direct cange-over.

edit* just read this, it doesnt make much sense. so to clarify. the diffs are different but the yolks bolts straight up.

[vkberlina]

Tailhafts can be different on VK modes 84 ran a sailsbury diff and 85 ran a borgwarnerdiff with some model overlap. different tailshafs for each, aso aussie 4 speeds for 84 and MC6 and M76 4 & 5 speed respectfully on the 85.
So 84 would ra a yoke and 85 a flange

cheers
Scott

[Darren_L]

I did a 202 -> 308 conversion on my previous VH.

-V8 & 6 cyl k-frames are identical on VB-VK
-radiator is different
-tailshaft will need to be either replaced with a V8 shaft or modified.
-manual clutch pedal and bracket is different on V8. 6cyl will work but will be very heavy
-the smaller V8 diff (used on most 4.2L Commodores) is the same as the 6 cyl diff
-the larger 10 bolt Salisbury diff standard on 5L Commodores (VB-VK - excl 85 model) has a larger yoke
-all V8's had rear discs (some 6cyl did too eg SL/E)
-V8 wiring harness plugs straight into connectors on firewall. Simply unplug 6 cyl harness and plug in V8 harness.
-5L came out with 1 inch brake master cylinder (to suit 4W disc)
-4.2L usually had the 15/16 master cylinder, some models eg SS were released with 1 inch - note rear disc brake master cylinder is different to drum brake rear 6cyl master cylinder

[jaywa]

Not all V8's had disc brakes. 253's didn't it was an option. I have a VB in my shed that came out factory with a V8 but no disc brakes. The easiest by far is buying a full V8 body so all front brakes, suspension, exhaust and all that are there. Putting it in is the easiest part. Most things line up but if you buy everything seperate it'll cost more