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#1
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Help me decide..Blown Big block or Blown small block for E-Body!!!!
Guys I need your help!
I don't mean to bore you by posting this again but I need to get the decisive answer. I have a '74 challenger. it came with a 318 which I plan to get rid of. I also have a 360 short block (needs to be reuilt)and new in the box aluminized headers. I plan to build an edelbrock aluminum headed BDS 6-71 blown motor for this car, but just can't decide whether to go with the 360 or buy a 440 and start from there. All I'd be out is the small block headers and new motor mounts.(Will I have to get a new bell-housing for my 727 if I go 440-by the way?). Which should I do. |
#2
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If you go 440 you won't need just a new bellhousing, you'll need a whole new trans as big block and small block tansmissions are different and they are all one piece. Personally I think small block is the way to go, and I'll list the reasons below.
1) Your car is already set-up for it. 2) you already have a motor 3) TRW make 8.0:1 forged pistons for the 360 that you can buy straight off the shelf. 4) A well set-up 6/71 powered 360 will make 450-500hp quite easily, and that should be enough as you didn't say if you want to race it or not. The only problem you have is if anyone makes a kit for the 6/71 to small block. I find in my dealings with American Companies that they aren't interested in making a kit unless they can sell 10,000 of them. There is a guy in Sydney that makes one, and he makes probably less than 4 a year but he is still reasonably cheap. A kit minus blower was $3050AUS ($1500US) when I bought one earlier in the year and it included everything minus blower and bolts. It's also a custom cast manifold, not a cut and welded 4bbl manifold. It will cost you alot more in the long run for a big-block set-up, so I recommend the small block. But that's my opinion. |
#3
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Thanks, Mate!
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#4
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I think that BDS (Blower Drive Services) makes the complete setup for the small block but not positive. I cant even give you their website info but just search out the name and you'll find it. Maybe someone here will know....good luck......Dave
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#5
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www.blowerdriveservice.com i was thinking about picking up one of these kits for my lil red!
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#6
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to quote from a book
assuming your going to race this engine! 1966 chrysler introduced first smallblock race package D-dart 275hp 273cid... only la engine over one hp per cubic inch in production had big holley carb big mechanical ca and headers. in med 70's big blocks where phased out The NACAR version was winning with small blocks. richard petty started winnign with the 355 cid mopar small block. he had more POWER AND RELIABILITY than other the other small blocks. In 74 big blocks where king of the Drag racing scene therfore chrysler started racing he 360 4-barrel package in superstock and did very well they quickly demonstrated that the 360 was a force to be reckoned with. in the stock and super stock classes at the time the faster you went the more you were weight-penalized and it was soon apparent that the 360 was fast. Chrysler engineers soon determined that the best class to demonstrate th small-blocks full potential was the modified category. I took all this from the book how to hot rod small block mopar engines.... it goes on to say' that that a small block in the car Bob Glidden drove "arrow" went almost undefeated. So dominant were Glidden and the Arrow that NHRA factored the car three times in one year. I don't know about you but it sure seems like the small block is the way to go..... good luck.... a fellow moparian |
#7
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Good qute chrisj0123.
I have to say I'm with blownhemi on the small block issue. It's a minor savings not to swap. Also a tad cheaper than a R/B blower. Overall, it will make a good package. Then, if the speed bug bites harder, theres always porting the head. Just build that bottom end well. |
#8
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Out of curiousity who makes blowers for 440's.... (I have an 8.5:1 440 motor) How much is a complete kit????
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#9
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I always thought that the 727 tranny was the same for big block small block and hemis and all you had to do was change the bellhousing am I wrong ??
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#10
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big block and small block bellhousing patterns are different. and for the automatic trannys, they don't have a changeable bellhousing. the bellhousing and case are one unit. The manual trannys do have changeable bellhousings, but, not the automatics. On the good news. the internals swap.
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#11
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Just did the BDS 6-71 thing for my soon to be 416. The following is an excerpt from my "Timeline 2001" page in my website:
Sep 07th. Ordered a BDS 6-71 Blower kit from Good Vibrations Motorsports, 8858 Whittier, California, 90602, 562-945-7669. Talked to Jesse. Kit and extra pieces include: 1) BDS-406A3S1/2 Blower kit, 340 Chrys Late 6-71 1V 1/2P 2) BDS-9000C D/Carb Scoop with Filters (polished) 3) E-76-107 Carb Linkage kit dual side saddle (Enderle) 4) BDS-C7010P Polish Blower and Intake kit 5) BDS-C5001 Blueprint new carbs (GVM rec'd carbs on 09-14-01) Set up to run 6.6% Overdriven, 5.5 - 6.0 Boost, 11.5 final compression ratio with 8.0:1 pistons, Upper pulley has 30 teeth and Lower pulley has 32 teeth. Total as of today is $4204.31 without shipping. Sep 09th. Ordered two Holley 1850S's from Jeg's. Had them ship to Good Vibrations Motorsports. $406.97. GVM rec'd 09-14-01. Good Vibrations Motorsports were cheaper than going through BDS. They were easy to work with and I would recommend them. My site is a little whacky as MSN has upgraded (degraded ) the system, but I have a photo of the setup in there. |
#12
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what's the estimated horsepower for a supercharged 360 with fuel injection(bds)??
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#13
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Check out this link:
http://www.blowerdriveservice.com/CG...iption_id=1166 It is for a BDS Intake for ~$800.00 for a late 360 Good luck |
#14
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For sublime440 a blower kit for the 440 is available from Big Als Toy Box at
http://www.bigalstoybox.com/price.html Good Luck |
#15
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Hey Dilley340, your workbench is way too organised, i hate you!
That is a very cool blower set-up though. I'm picking up mine tomorrow. I'm buying a complete big-block kit second hand for $3200Aus ($1600US) and I'm using the blower from it with my brand new small block kit that doesn't have a blower. I'm definately not going to shed any tears about having a big-block chrysler kit sitting on the shelf. Hopefull mine should be finished after this weekend. |
#16
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a friend of mine down the street has a 440 with a 8-71 sitting ontop of it in a nice looking road runner. Soo.. if i can talk him out of it for the right price, That will soon by my other car. Otherwise.. I'm still in the market for an E-body, which is going to be another twin turbo project, big block of some sorts (if the body is cheap enough, then a Hemi it is)
I really think a forced induction small block allows you the best of everything. Honestly, with my 69 cuda, I get 24 mpg on the highway, 400 hp to the rear wheels, starts easy, runs smooth, in traffic on a hot day, it wont go over 190 degrees, and enough torque when to boost hits to make a smile on your face that even an ex-wife couldn't ruin. Really, just a pleasure. |
#17
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dewme - can you tell us more about your 6spd behind your 360? thanks.
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#18
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there has been alot of postings going over all of that already. just check my web site, that will cover alot of it. any other questions you have about it, i will be happy to answer.
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#19
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You knew it was coming....
Skip the aluminum lung and drop in a TT360! You'll have more power from the same boost and can get it done much cheaper. If you decide to bump the power up a little, all you have to do is tweak the wastegate. Turbos are silent and fit nicely under the hood. The installation is a bit more difficult but well worth it. If you want folks to know about the turbos, simply delete the mufflers. The turbos will chop up the exhaust pulses and quiet the engine sufficiently. When you spool 'em up, they'll make themselves known. That can be quite intimidating. If you live in a town with an overactive law enforcement community, the turbos are definately the way to go. The cops tend to smile and wave as I cruise by in the hot rod. If there was a big ol' blower poking through the hood, I bet a few more of 'em would be more tempted to follow me around for a little while. I know it happened when the car had loud exhaust. |
#20
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many changes
I own a blown big block in my 1939 dodge coupe + I prefer the torque of the big blockbut if compact + easier is what you want I would go small block.any way you go just make sure you have the best cooling system available(aluminium rad,high flow water pump,etc + a good set of headers 2" small block + 21/4 big block with good flowing exhaust.I tell any of my customers if you want a good blower motor + set up it costs about 15000 dollars.I have about 45000 miles on my car + motor + only have done oil changes + two pushrods(factory defects).the small block should be easier to cool.
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#21
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I'm working on a 671 blown 383 and would be interested in hearing more on Bill thompson's setup.
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#22
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another thing to consider
i am of the old sayin that goes 'there is no replacement for displacement', but, another thing that i dont think has been mentioned yet, is that you are gonna have to change your k-frame as well, if you swap up to the big block. I will say one other thing for thought, you could run a 440 in your challenger without a blower, and make it make as much horsepower as a blown 360 with a significant savings i would think.
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