which carby should i go with??

[hg premier]

just about to go shoping for a new carby for my vk 308
atm it has the standard carby in it
i had in mind a holley 650 double pumper

what do people think i should go with?

im looking to bump up the power without goin internal on the motor


how much will it bump up the power??

the next mod after the carby will be a full exhaust system

cheers

[v8commy]

the rochester that you have on there is one of the best things you could have on there i wouldnt change it just rebuild it and give the car a tune -plugs, leads,rotor cap and button,filters oil etc also with the rotor cap get yourself a small cap sprint will know the part number i just got one as directed by ari666 and the response and the smooth idle amazes me and fuel consumption has dropped noticeably

[GetToDaChopa]

Whats this small cap sprint? What does it do?

[ari666]

so the cam is stock and manifold stock? 650DP will waste so much petrol you wont believe it. do yourself a favour, go buy a rebuild kit for your quaddy, waste a day installing it all. then waste another day tuning and tweaking everything till its perfect and you will never be happier.

i FINALLY finished my quaddy the other day, itll kick the arse out of both my 650DP and 750 vac secondaries and now i can drive to work and back everyday on one tank, whereas i would last 3 days with the others.

how to rebuild/ modify quadrajets (also vac hose diagram)

have a quick look at my post i will add more to that later, cos i have my spare quaddy off the car at the mo, so i can take more pics of the choke asembly and how to strip it/ put it back together.

anyway, in summary, 650 is a waste of time completely, unless you are tryin' to shave 0.05 seconds off your 1/4 mile time. other than that you may as well just tip petrol into your manifold.

[ari666]

Whats this small cap sprint? What does it do?

he means the dizzy cap.

[v8commy]

Whats this small cap sprint? What does it do?

yeh i mean dizzy cap and sprint is a parts shop in sa lol and the cap being smaller means the spark has less gap to jump across

[NZVK308]

Just read thread with great interest...I have quaddy on my 308..engine is stock aprt from cam and 40thou over..being looking for holley600..
not meaning to hijack thread here...
If the quaddy is worth rebuilding then sweet....How bigger difference does the smaller cap electronic dizzy make over the large black cap design? power/fuel consumption etc..??

[v8commy]

power difference not really its more response and better fuel consumption as your plus are getting a greater spark actually burning your fuel should have seen my old cap and button rooted

[NZVK308]

Finding one over bit needle in hay stack, unless i go after market..

[immortality]

Finding one over bit needle in hay stack, unless i go after market..

check out sayers auto spares on angle street in Otahuhu. they stock a lot of early girl stuff. i haven't seen my old mate dale there in a few years. must pop in and say hi

[greenfoam]

The quadrajet is far more advanced. If the Holleys were any good at anything other than being simple they would have been be OEM on cars, but they weren't. They were easy for people to understand and so they got a big following

[ari666]

the caps are cheap as f... bout 20 bucks off ebay. its just the points dizzy cap. you just unclip the big cap from the bottom and they are the exact same size os the old smaller points cap. replacements dont need to be top quality just as long as they stick to the tolerances. BUT if you change you need to make sure that you have low resistance leads. its pretty safe to say that you wont considering that the engine is prolly 20 years old and high res leads are a thing of the past. if you are running with your stock high resistance leads there may be a bit of an issue with crossfiring.

NZVK308- check out my thread about reco'ing em, and PM me if you need more info. pulling them apart is a lot of fun i have to admit, and now that i have finished the one i posted it HAMMERS. i need to go back to the dyno now

[NZVK308]

Hmmm got me thinking for sure... as previously;y stated mines the buly ugly bitch with thevacume advance one side and the HEI unit on the other side...It due for new set of leads when funds allow..Got me quaddy striped down...I was just going to chuck in a bath of acitone and give it death with the air gun...and a rebuild kit...Sayers very pricey unfortunately....might see what aging auto's have got when he re opens..cheers guys

[Guzzoline addict]

A 650 holley sould be allright, just make sure its a new one. Quadrajets were good but are getting pretty old( just a carby kit wont usually fix em) Maybe something like a 625 barry grant carb might be ok aswell.

[old mate]

quaddy will be fine but they can sometimes leak fuel which makes it a bitch to start. usually what happens is some bloke decides to tighten it to the manifold really tight, which bends the bottom of it. the quaddy in my old mans stroker is a little bent, but the one on my 253 isn't. just luck of the draw really.

get someone who knows what they're doing with quaddys to set it up, and it will be all sweet.

[v8commy]

quaddy will be fine but they can sometimes leak fuel which makes it a bitch to start. usually what happens is some bloke decides to tighten it to the manifold really tight, which bends the bottom of it. the quaddy in my old mans stroker is a little bent, but the one on my 253 isn't. just luck of the draw really.

get someone who knows what they're doing with quaddys to set it up, and it will be all sweet.

yep 100% right

[leigh 7005]

just forget about the holley and go edelbrock easy to use set up and have seen these on cars and perform heaps better than holley and rochester even better fuel econamy for a standard 308 id go a 500cfm edelbrock

[immortality]

the edelbrock carb is basically a fancy quaddy. what ever you do, just stay away from the double pumper style carbs for street use. VAC secondaries FTW

[hg premier]

Looks like I'm just gunna leave the carby then lol
cheers for all the help