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to put a 350 or 650 holley


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#1 _wraith75_

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Posted 25 December 2006 - 10:32 PM

to start a i want to put a 350 jeted up on my non stock 202 but my brother who is 51 years of age said i would be better to jet down a 650 now i dont know witch way to go cos it is a mate who 47 who has done it as well any help on this one . what im after is power out of the littel thing but in the same way i still want to go on a cruse and not take out a bank lone .

#2 _MYLJ_

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Posted 25 December 2006 - 10:46 PM

a 465 holley 4 barrel work well on a worked 202, a 650 holley will be a bit big for a 202 unless it is heavily modified , would also be heavy on fuel.

#3 FastEHHolden

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Posted 26 December 2006 - 12:13 AM

A square bore 390 would have to be the best petrol 4 barrel carb by far.

350's suck..and 650 is miles too big....a 202 at 6000 rpm can only ingest about 320 cubic feet of air.

#4 _LX8VD69_

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Posted 26 December 2006 - 10:12 AM

yeah i agree with MYLJ, 465 would be better then a 650

#5 _T0rana_

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Posted 26 December 2006 - 10:19 AM

i was extreamly happy with my old 390 4barrel holley, Good performance and good on fuel.

#6 _Aquarius - LC_

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Posted 26 December 2006 - 03:23 PM

G'day wraith75,
If you really want to use a Holley, then the guys above have given you good advice^^^. Before my tripples i used 320,350,390 &465 on my worked 202,alot of time spent spent trial & error (many dyno runs). :rolleyes: my vote is also the 465, they can work really well,just need to experiment with jet sizes,power valves,secondary metering plates & finding the correct tension secondary opening spring (get the quick change kit). OR............go tripples!! :tease:

#7 _wraith75_

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Posted 26 December 2006 - 05:21 PM

mmm tripples u say would they be 45mill webbers can get a set of them to try of a mate he onley wants $150.00 . thanks 4 all your help. :rockon:

Edited by wraith75, 26 December 2006 - 05:22 PM.


#8 _Bomber Watson_

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Posted 26 December 2006 - 06:35 PM

thats very very very very very cheap for webbs.

im gonna run su's on my fairly heavily worked 202, should be fine.

so how heavily worked is this 202 of yourse?? some specks would be nice? some peoples ideas of heavy working differ from others :P

#9 V-SLR5000-P

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Posted 27 December 2006 - 09:20 AM

The basic formula for selecting the correct size Holley carby is:
(Engine cid X Maximum rpm)/ 3456 So, applying this to your 202 looks like this (202 X 6000)/3456=350CFM This formula assumes 100% volumetric efficency, which very few engines achieve. Assuming a volumetric efficency of 85% something around 300CFM would still get the job done. With vacuum secondaries the engine will tolerate a larger carby, but a 650 looks waaaay too big. A 465 seems plenty big enough, without knowing more engine details.

#10 Tiny

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Posted 27 December 2006 - 09:50 AM

THe main reson for staying with a smaller carby is to keep the airflow high through the venturis.
If you have high airflow, it creates a responsive car that meters fuel correctly and everything sorta just works. You MAY loose some top end if teh carby is *TOO* small though.
TOo large carb will be a bitch to tune, and with low air velocity through the venturis cause flat spots and rough running.

I think the 465 would be aboput the best middle ground.. i too hate the 350 holleys!

Cheers!

#11 _Aquarius - LC_

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Posted 27 December 2006 - 12:04 PM

Absolutely agree Tiny ^^^,
Whilst after much tuning i was happy with the overall performance using the 465,the one thing that gave me the sh#ts was poor idle quality! Running a
38/78,295deg camshaft , the manifold vacume at idle was just to low to maintain good airspeed (390 was better).So you end up with a tough sounding lumpy idle, but a car wich tries to stall each time air speed drops to low. Choice of inlet manifold can either help or compound the problem aswell, a swap from a custom (large intake volume) to a redline (much less volume) = more airspeed = better idle & low speed responsiveness, but the engine lost some top end power. So i went back to the custom manifold, raised the idle & got real good at heel toe throttle blips, :rolleyes:....... It went like a scalded cat though :D or so i thought ...turns out my engine really likes it's carby's in a set of three! :tease:
This is my experience, alot depends on your engine mods, how much head work,cam choice,exhaust ,the list goes on. If your engine is fairly mild ...i would recommend you consider WW stromberg or 34adm webber (xe-xf falcon).
It's all good fun!! :rockon:

#12 _wraith75_

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Posted 28 December 2006 - 07:59 PM

thanks 4 all the help ppl i have a 465 now just got to get it reco and a mainfold but i have put the 45mill webers on and that has made a big difrence so i cant wait to put the 465 on .so thank u all 4 your help and i have shut the other 2 up there now all quiet thank god .. :rockon:

#13 _Keithy's_UC_

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Posted 29 December 2006 - 12:20 PM

I wouldnt take the webers off... They are becoming hard to get and can fetch up to $1500 for a good set. If your satisfied with them, but dont like the fuel consumption, then manage your right foot a bit better!

I have a 350 Holley on my motor (worked 179) and have made more power than 202's of similar spec with 465 Holleys... And mine runs 14's down the 1/4.

My vote - the Webers!!

Cheers
Keith

#14 _Bomber Watson_

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Posted 29 December 2006 - 05:56 PM

mate, if you dont want the webbs i'll give ya $250 for em.




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