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650 holley on a 253

Started by _blenda_ , Feb 19 2006 09:11 AM

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24 replies to this topic

#1 _blenda_

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Posted 19 February 2006 - 09:11 AM

hey guys i just bought a 253 and its got a 650 holley on it i was just wondering is that to big or would i have to down size it

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#2 _Herne_

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Posted 19 February 2006 - 09:41 AM

Unless the 253 is red hot you dont need a 650 holley. A 465 Holley would be more than adequate for performance and dare I say it - economy.

Cheers
Herne

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#3 _CHOPPER_

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Posted 19 February 2006 - 10:36 AM

And if it is a stock 253 that doesn't get pushed hard, he could get away with a 350 Holley.

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#4 Litre8

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Posted 19 February 2006 - 02:29 PM

And regardless of the size chosen, for daily drivers Holleys aren't always economy friendly.

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#5 FastEHHolden

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Posted 19 February 2006 - 03:05 PM

A bucket of fuel with a hole in it may offer better economy.

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#6 Litre8

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Posted 19 February 2006 - 03:06 PM

^ that was the first prototype Holley..

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#7 _TORANASS_

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Posted 20 February 2006 - 09:10 PM

A bucket of fuel with a hole in it may offer better economy.

Whats a predator then? A 44galon drum with 2 holes in it?..lol

John

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#8 _Bomber Watson_

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Posted 20 February 2006 - 09:30 PM

yeah, and a flash emblem.

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#9 MRLXSS

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Posted 21 February 2006 - 11:13 AM

Well i just borrowed a 650DP Holley with Mech Secondaries on my stroker and i think its a bit to much! haha jus a lil! i would much prefer a Vac Secondaries Carby... Such as a Smaller holley or a Quadrajet... presonally a quadrajet

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#10 _TORANR AMORE_

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Posted 21 February 2006 - 12:55 PM

I had a 253 with fueled with a 650 Holley and it was definately too much, it used to run fine until I tried to give it some gas.

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#11 _Joanne_

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Posted 22 February 2006 - 12:27 PM

I HAVE EXACTLY THE SAME PROBLEM, I HAVE AN LX WITH A 253 AND IT HAS A 650 HOLLEY.. I WAS PLANNING TO GET A 450 HOLLEY VERY SOON AS IM SPENDING ALOT OF MONEY ON PETROL, BUT, MY QUESTION IS, WOULD MY CAR GO SLOWER ONCE I PUT A SMALLER CARBY ON IT??? ALSO, IM PLANNING TO STROKE IT TO A 308 SO DO YOU THINK I SHOULD JUST LEAVE THE 650 ON THERE OR WOULD A SMALLER CARBY SUCH AS A 460 STILL BE BIG ENOUGH IF I STROKE IT?

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#12 _TORANR AMORE_

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Posted 22 February 2006 - 12:38 PM

650 would be fine on a 308, but my question is why do you want to stroke a 253? Why not just use a 308 block?

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#13 _Joanne_

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Posted 22 February 2006 - 12:49 PM

Because i was told that a 253 and a 308 had the same block but with a different stroke.. is this not right???

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#14 surfmaster

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Posted 22 February 2006 - 01:52 PM

Later 253's in the VH Commodores had four barrel factory carbies which werent too bad - perhaps one of these would be more suitable?

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#15 Dr Terry

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Posted 22 February 2006 - 02:50 PM

Hi Guys.

Joanne said

" Because i was told that a 253 and a 308 had the same block but with a different stroke.. is this not right??? "

NO it is not right. The 253 & 308 have the same stroke, but a different bore (3.625 vs 4.00). Problem is you can't bore a 253 block to 4.00" to make it a 308. You might as well just buy a 308 to start with.

surfmaster said

" Later 253's in the VH Commodores had four barrel factory carbies which werent too bad - perhaps one of these would be more suitable? "

The Q-Jet carby was factory fitted to ALL Blue 253 V8s, in the VC, VH & WB series cars.

Dr Terry.

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#16 _A9_X_

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Posted 13 June 2006 - 01:41 AM

Had a 465 vac sec holley on my 253 LX installed and tuned by Doug Chivas at Revesby many moons ago, a real nice carby that give good economy and performance.

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#17 MRLXSS

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Posted 13 June 2006 - 02:07 AM

Yeah get a Quadrajet id say... if you really want a holley get a 465 vac sec one!

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#18 _Lostit_

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Posted 13 June 2006 - 10:01 AM

Big blocks from the states used to run with 2 barrel carbies.

" Bigger isnt always better"

Lostit

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#19 _Yella SLuR_

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Posted 13 June 2006 - 10:51 AM

The Q-Jet carby was factory fitted to ALL Blue 253 V8s, in the VC, VH & WB series cars.

Good Dr, where these the same 780 CFM carbs as on the 308 with smaller jets, or smaller quadrajets? Would be interesting to know.

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#20 _EXLXSL_

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Posted 13 June 2006 - 11:05 AM

I had a VC with 4.2 and Quad. Also had a manual for the car but I'm not sure if it was a Holden or Gregory's manual - I remember comparing the carbs between 4.2 and 5.0. Venturi sizes were the same but jets and needles (primary and secondary) were different. Car ran fine with it. I did try a 465 too and it ran a lot harder but I think it sat a little higher due to having to use an adaptor and put it too close to the bonnet. Ended up going back to the Quad.

On my old 253 SL hatch I changed to a 350 Holley - got better power and economy over the 2 barrel Stromberg and was also better than the Commodore.

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#21 makka

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Posted 13 June 2006 - 01:20 PM

I had a vac sec 650 on my 253, and even after a tune and re jet, it doesnt compare to the Quaddie I have now

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#22 _Herne_

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Posted 13 June 2006 - 01:27 PM

I had a vac sec 650 on my 253, and even after a tune and re jet, it doesnt compare to the Quaddie I have now

Thats cos a 650 Holley is waaaaaay tooooooooooooo largeeeeeeeeee for a 253

Even a 600 Holley is a bit large unless the 253 is very hot.

But we gotta try these things in the never ending chase for more power lol

Cheers
Herne

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#23 _A9_X_

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Posted 13 June 2006 - 01:29 PM

I actually changed my inlet manifold as well to a redline, didnt have any clearance issues at all, cant remember now what power it made but combined with a HMHeaders extractors and dual 2inch from memory it went pretty hard

Edited by A9_X, 13 June 2006 - 01:33 PM.

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#24 limo

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Posted 13 June 2006 - 05:05 PM

Back in mid 80s I had LH 253, mild cam redline manifold with 450 Holly vac
secondaries. With 4 speed and 2.78 LSD, was excellent, lots of grunt but good
on fuel if stay on primaries.

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#25 _Loki_

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Posted 13 June 2006 - 10:30 PM

Running a 450Holley on my 5.2L.
Probably would benefit from larger, but with these fuel prices - who can afford to put the foot past halfway anymore anyway

The question about the 600 on the 253 losing power - probably find it'll increase performance dropping down the carby size O.o