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4/71 onto a 202

Started by _Gav73_ , Jun 20 2010 03:51 PM

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17 replies to this topic

#1 _Gav73_

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Posted 20 June 2010 - 03:51 PM

Just wondering if any one has or is thinking of doing this,

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#2 dattoman

Do I feel lucky? Well, do ya, punk?

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Name:Neil
Location:Perth Western Australia
Car:LX SS , 76 Cadillac , 3 x dattos
Joined: 04-February 07

Posted 20 June 2010 - 04:04 PM

My old LC had a 4:71 for awhile

I'd recommend it
All it takes is money and a helpful fab shop

I think theres an old blown 6 racecar around here somewhere

http://www.youtube.com/watch?v=QDOn-LfUqps&feature=channel

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#3 _why-psi_

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Posted 20 June 2010 - 04:04 PM

Just wondering if any one has or is thinking of doing this,

Im in the process of doing it at the moment

check out my thread here whypsi 4/71 blown torana

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#4 wot179

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Name:Jesus Bloody Christ
Location:Sunny Santa Maria
Car:Goon
Joined: 06-February 09

Posted 20 June 2010 - 04:29 PM

Have a look through here.
http://www.gmh-toran...=0

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#5 _Gav73_

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Posted 20 June 2010 - 05:50 PM

Hey Why Psi what have you done to your engine to take the blower, and who have you sourced your parts through.
Cheers Gav

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#6 _why-psi_

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Posted 20 June 2010 - 06:57 PM

i bought my engine off a mate who was running a turbo on it.

Block is a Holden 3.3 that has been o-ringed. i also fitted milodon head studs
Head is a low comp 9 port yella terra with a copper head gasket, Yella Terra roller rockers
Crank is blue motor steel crank
Rods are starfire
Pistons are HQ Racing that have a 19cc dish machined into them
Compression Ratio: 6.8:1
solid cam. unsure of specs but i believe its a turbo grind
Blower: GM 4/71 overdriven 10%
Fabricated sheet metal blower manifold

the manifold was purchaded on ebay. although i think you can still find Newby manifolds. or try fisher superchargers

Fisher holden 6 4/71 manifold

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#7 _Gav73_

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Posted 20 June 2010 - 07:40 PM

Have you run your engine yet what do you do with your car drags,burnouts what HP do you think you will get.
Cheers Gav

Got any more pics of your car with the bonnet down.

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#8 _why-psi_

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Posted 20 June 2010 - 08:11 PM

Have you run your engine yet what do you do with your car drags,burnouts what HP do you think you will get.
Cheers Gav

Got any more pics of your car with the bonnet down.

hoping to take it to the drags mostly. havent run the engine yet. hoping to get close to 350hp at the wheels.

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#9 Stinga

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Name:Stinga
Location:Wollongong, NSW
Car:HD Holden ute, and sedan, UC torana
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Posted 21 June 2010 - 12:23 AM

i will also be doing this, bought the blower and injection from trent's (Placid HB) HB project. been looking at manifolds and will probably go with the fisher one, but havent made any calls to find out price or availability. have most of the other bits and pieces, head will be alloy 12 port. sadly mine wont start coming together until i get home at the start of november, oh and its going into my HD sedan

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#10 _oldjohnno_

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Posted 21 June 2010 - 07:06 AM

Interesting. I'm toying with the idea of doing a blown 2.8 once the current projects are finished...
One thing that stands out doing the preliminary sums is the need for lots of exhaust capacity ie. very oversized valves, 1-3/4" - 3" pipework...

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#11 _Gav73_

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Posted 21 June 2010 - 08:13 PM

Looks the buisness WHY PSI your doing a great job Im keen just looking at the pictures. I just put a set of Convos on mine just got bored with the sprintmasters after 10yrs. You will have to keep me posted on your progress are you happy with the way the car has turned out and what times are you aiming for.
Cheers Gav

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#12 _Gav73_

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Posted 21 June 2010 - 08:21 PM

Sounds good MCH11N it sounds like you work away. What crank,rods, will you be using and what revs do you plane on reving it to, nice looking HD
Cheers Gav

Hey OLDJOHNNO just curious why would you go 2.8 not 3.3
Cheers Gav

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#13 _why-psi_

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Posted 21 June 2010 - 08:56 PM

Looks the buisness WHY PSI your doing a great job Im keen just looking at the pictures. I just put a set of Convos on mine just got bored with the sprintmasters after 10yrs. You will have to keep me posted on your progress are you happy with the way the car has turned out and what times are you aiming for.
Cheers Gav

Thanks Gav73. i am hoping to have the engine running by the end of the year. just need to rebuild the blower and buy a 750 holley blower carb. not cheap! haha.
if the car dips into the high 11s i will be over the moon. fingers crossed.

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#14 _Bomber Watson_

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Posted 21 June 2010 - 09:00 PM

Not hard to blower reference a carb mate, and not expensive from the states.

Cheers.

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#15 wot179

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Name:Jesus Bloody Christ
Location:Sunny Santa Maria
Car:Goon
Joined: 06-February 09

Posted 21 June 2010 - 09:27 PM

Sorry about the quality.......

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#16 _oldjohnno_

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Posted 22 June 2010 - 05:21 AM

Hey OLDJOHNNO just curious why would you go 2.8 not 3.3
Cheers Gav

There's a possibility - and it's only that, I haven't really thought seriously about this - that the additional strength of the little engine might more than make up for its size by being able to handle more boost and more rpms..

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#17 _Gav73_

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Posted 22 June 2010 - 07:55 PM

Hey WOT179

Great pic I had my chance to have a steer of a sling shoot and turned it down, I raced a 540bbc HQ ute for a whlie and 800hp on a 9" slick was wild enough my balls arn't made of steel.
Cheers
Gav

Has anyone priced a manifold of Fisher Blowers.

Edited by Gav73, 22 June 2010 - 07:56 PM.

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#18 _clubspClubsportr8ortr8_

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Posted 23 June 2010 - 11:47 PM

Hi there, i have priced the complete kit from Fishers this week and around $6800 for the 4/71 setup and around $7900 for the custon 5/71 he also does but complete custom and brand new blower so i am assuming manifold to be around the $1000 or more.Hope this helps as i am doing a blown engine and turbo engine aswell at the moment for my drag car and a vey wild JZED headed engine for my XU-1 so hopefully all works out and they run some decent numbers.

Jeff