View Full Version : What Holley Should I Be Running?


revelry
30-04-05, 23:49
Hey guys,

At the moment I have a holley 750 or 850 on my 5L 308 block which, i would presume, is overkill? First of all, is there any way to tell what size my holley is?

Second...should I think of downgrading to a Holley 650 dp? It's a standard 308 block with 40thou over-bore, K&N oil filter(:rolleyes:), some decent distributor leads, twin 2" system with no cats..no idea if any cam work or anything else.

Would I save much on fuel going from a 750/850 to 650? And would i lose much power/exhaust note?

Cheers

viper1431
01-05-05, 01:49
On the choke horn there should be a serial number, i think its on the front right hand side from memory. Get that and on the holley site you can look it up to see what size it is.
As for the carb i find the quadrajet to be very good. Ive also tried a 650dp and 600 square bore vac sec and out of those 2 would choose the 600.

MadVK308
01-05-05, 07:52
I run a 650 which I havent had a trouble with, I can get reasonable fuel economy if I need to (at the moment its tuned for grunt).

Ive never really used the stock rochesters, some people say theyre crap, other people swear by them....so I cant really comment.

Epitaph
01-05-05, 10:42
i wouldnt bother running a 650.. just run like a 465 or something small, a big carb isnt gonna help.. :)

revelry
01-05-05, 11:33
How much power would I lose if I chose to go for the 465 or 600?

spanners
01-05-05, 12:09
you would proberly pick up more power running a 600vac on a stocky the 750 or 800 is tooo big pm me the part number and ill c what it is also if its a 800 will u sell it i need 1

revelry
01-05-05, 17:21
Uh, I was having a look for the numbers and couldn't find anything?
Only found:
4926
7866
7235
8522
6R 4237B
12R 5395B
??

I know it has a 13-14cm diameter if that helps.

ITSGMH
01-05-05, 20:05
what's wrong with running a Quady, properly tuned and jetted these work very well - I know which one I'd be choosing!

VL|B0GaN
01-05-05, 21:35
This is probably a stupid question... but why do the 5L's have a carby??

ITSGMH
01-05-05, 21:52
This is probably a stupid question... but why do the 5L's have a carby??

the VL 304 Black motors were the last of the Carby engines (except the Walkys which were injected), the VN's were the first Commos to all come with injection!

VL|B0GaN
01-05-05, 22:52
oh right I was wondering why the v8's were the only ones that weren't injected. so the first injected GM engine didn't come about till 89?

ITSGMH
02-05-05, 19:06
the Walkys were injected, you know the twin throttle body setup that works so damn well!

BOOSTN_06
03-05-05, 22:33
mate go a 600 vac/sec. especially if ur planning to go for a bit more power down the track, they will still work well. economy and power, best of both worlds. 600dp will chew abit more petty.

VK355
04-05-05, 03:26
mate go a 600 vac/sec. especially if ur planning to go for a bit more power down the track, they will still work well. economy and power, best of both worlds. 600dp will chew abit more petty.
600dp will only chew alot more fuel if there not setup properly.
Go with a 600dp well suited to a 308 with furure mods 465 is to small more suited to a 253.
Jost remember holley's dont comply with emmissions & rwc so if you have to get a rwc depending on your mech you may have to use the quaddy to go through a rwc.

VL383
04-05-05, 08:26
Don't run a holley get a good setup quadrajet and it will run much better....

ITSGMH
04-05-05, 08:33
Don't run a holley get a good setup quadrajet and it will run much better....

exactly, a "properly" tuned and jetted Quaddy is good for alot of power, sh!ts on a Holley...

VK355
04-05-05, 10:03
exactly, a "properly" tuned and jetted Quaddy is good for alot of power, sh!ts on a Holley...
A properly tuned anything will sh1t on anything not properly tuned :D
It doesnt matter what carby make you use if it's not tuned properly.
Choose the carby for your application d/p street/strip vac sec more daily & occasional street strip.
Most people choose a quaddy because they have smaller primaries are economical & feel more responsive for a daily driven car.

VL383
04-05-05, 11:03
I agree with what you say. I am assuming that Revely's car is only a street driven car so the benefits of running a Quady far outweigh a Holley in this example.
-More economical
-More responsive down low
-Emission's legal.
If you do regularly run your car on the street and strip and are not worried about the possibility of a large EPA fine then for sure run a Holley because they can be setup better for drag racing use.

ITSGMH
04-05-05, 12:37
A properly tuned anything will sh1t on anything not properly tuned :D
It doesnt matter what carby make you use if it's not tuned properly.
Choose the carby for your application d/p street/strip vac sec more daily & occasional street strip.
Most people choose a quaddy because they have smaller primaries are economical & feel more responsive for a daily driven car.

you've missed my point completely, what I meant was that alot of peeps discount Quaddy's for their high performance engine builds because they know nothing about them. I'm just saying that I'd prefer a Quaddy over a Holley any day" on the right application"!

VK355
04-05-05, 13:54
I havent missed the point i know how good a quaddy is & what they are capable of doing i was just pointing out that a carby whether it be holley roddy edel if tuned properly & jetted they will all make alot of power so ther4 it would come down to personal preference of what someone has has with a particular brand.
By the way a quaddy flows around 750cfm because the jets & small primaries this is why it still works well on a 308 or chev 350

NEROAD
25-05-05, 15:22
hey mate run the qudie much better carby i had a 650 DP on my 308 and it just keep flodding it the qudie r a really good carb they can flow 750 to 800 cfm so whey go holly ****n **** things i hate them will never go back :mad:

Epitaph
25-05-05, 15:39
maybe the tuning guy couldnt tune it? they have been known to be the best value for money carb for a long time..

Sinister
25-05-05, 16:05
run this holley!!

http://www.horsepowerinabox.com/HPIABV8/images/f7486.jpg

Epitaph
25-05-05, 16:06
that's the one i was looking at running ;)

revelry
25-05-05, 16:33
I agree with what you say. I am assuming that Revely's car is only a street driven car so the benefits of running a Quady far outweigh a Holley in this example.
-More economical
-More responsive down low
-Emission's legal.
If you do regularly run your car on the street and strip and are not worried about the possibility of a large EPA fine then for sure run a Holley because they can be setup better for drag racing use.
Thats what I was looking for, something like this.
Yeh it's street driven, it's nothing insane or anything...just want the tough v8 note that goes with it.

This bull**** mechanic was saying quadrajets are hard to find now? Or is he bullsh*tn?

wagonshaw
26-05-05, 18:34
are you still going to run the super charger epitah. is that the one like the B&M under bonnet S/charger

da_ilks
27-05-05, 12:05
run the quaddy... keep it legal. no butt f*ckign when you get pulled over :p

NEROAD
30-06-05, 00:27
run the quaddy... keep it legal. no butt f*ckign when you get pulled over :p

just like da_ilks said no b***** when u get pulld over and smother power ;)

aus880
02-07-05, 07:54
what's wrong with running a Quady, properly tuned and jetted these work very well - I know which one I'd be choosing!


Agree, Much better than a Holley