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85 305 Carb to RAMJET 350 Swap??

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Old 09-04-2002, 03:05 PM
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85 305 Carb to RAMJET 350 Swap??

Ok guys, this is my first OFFICAL post, I have a queston for you guys, i'm not that mechanicaly skilled but I wanna do a 305 Carb'd swap to a 350 RamJet motor swap, my car is BONE STOCK down to the darn paper filter, i'm the orig. owner. well my question is how difficult would this be, ofcourse i dont plan on doing the work my self, but the question is what would be the major troubles with this other than $$$ i've seen the motor sell for around $4,000 at places, then i'll need an mech. to install. Anybody here done this swap b4? I can use all the feed back i can get.
Old 09-04-2002, 08:09 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
you will need a high flow fuel pump with bigger fuel lines, at least 3:42 gears with posi a strong tranny (could get away with 700R4 but NO WAY WITH T-5). It comes with e new wiring harness but I am sure there will be hundreds of dollars spent in unseen costs. If you have endless money, no prob swap. But if you ar elike me and value money than look into the GM LG4 to 350 conversion. It comes with new exhaust, motor and other things necessary for a complete swap. They say the combo is good for mid 13's.
Old 09-04-2002, 09:53 PM
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Yep...

You do need an electric high flow fuel pump....

I was thinking of doing the same engine swap to my car.
But My car is already equipped with Multi Port Fuel Injection.
But just a V6, hence the need for the motor swap!!!
I think I can get away with my stock fuel injection, since the
factory fuel pressure is a constant 40-47 PSI. My fuel injection
from fuel tank to even the injectors are the SAME as the V8s.
just two less injectors, of course. If I need to, to save time
and fuel starvation, I can go with an MSD fuel pump
booster. Works the same as installing a high flow pump.
This way is better though, you can ADJUST the voltage drop
through the booster. The less voltage drop from the tank to the
ECM, the better amount of fuel flow! OR...If I need to, I can get a high flow electric fuel pump. An easy replacment made from Holley. It's a direct bolt on for me. But will require mods to your car. Better off with a universal EXTERNAL electric fuel pump instead.

I'm also swapping trans. with a custom built V8 700r4 to hold up
to 500hp ( from my friend who is a Trans. guru!!!)

My gears swap from 3.08 to 3.73 with locker setup and rear end
support cover with Spohn Performance driveshaft.

ShiftyCapone:

Remember, this Ram Jet 350 only rated at 350hp, 400ft. lbs.
Yes, that's fast! But the torque rating is only 50ft. lbs. more
over the STOCK 350 TPI my year! ( 91-92).

You can make a naturally aspirated 350 TPI modded to
do just what the Ram Jet 350 throws out, but like 4000
dollars later!!!! ( Trans. rebuilt to hold the power! )

Last edited by Camaro_nut; 09-04-2002 at 10:32 PM.
Old 09-04-2002, 10:14 PM
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Just my thoughts....

I will be doing all of the swapping to my car. With help of my
friends, co-workers. I know what's involved with swapping.
I know I'll be spending some Fat Cash, too! Like about 10,000!
Not including the 1200 dollars just in my suspension already.
The good thing about being an experianced Auto mechanic,
that I can do all of this with a lift to do it on, and NO labor
costs. Here's what I'll do in order of swapping...

complete rearend overhaul, about $700
have a used V8 700R4 rebuilt , about $1200
buy the motor and other stuff to go with it,
(mounts, brackets, radiator, hoses, belt, etc.) about $7000
swap the motor and trans. together
with jet hot coated headers to Flowmaster 3" exhaust


DONE! Suspension/Chassis/Rearend will be done
before the motor/trans. swap so the car can hold
it up nicely!!!!
Old 09-04-2002, 10:52 PM
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Well my goal was to get a motor that would put me into the 13's from there I wanna build it up to 11's (hopefully) thats why I thought of the RamJet as an easy idea, i wanna go with fuel injecton instead of carb'd so i can run an blower easier.
Old 09-04-2002, 11:52 PM
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Well,

That's cool that you want to do 13s. That's my goal as well.
But I think I'll be happy with high 12s to low 13s personally.
'Cause lower than 12.00 seconds, You'll need a roll cage in that
bad Larry! That's more money and more labor! That rearend
may NOT hold up under 12s! You'll have to swap in one of those
custom fit Chevy 12 bolts, or Ford 9" rear. That's like $2,000 NOT
including labor! So in theory.. MORE SPEED=MORE MONEY!!!!

Good luck, happy hot rodding!

I can't wait to build mine now!!!!!

Laters......
Old 09-06-2002, 10:47 PM
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Car: 86 Iroc-Z28
Engine: FB385
Transmission: 700r4
Talk about blowing money! I am doing basically the same thing right now! I purchased the fastburn motor with a hot cam kit and wasted some money there! I was told that you need the whole kit for my motor, not the case. We did not look at the springs in the kit compared to the springs on the heads BEFORE we took off the heads! I looked at them and they looked identical. A phone call later, sure enough, they were the same exact springs. I told them that they really need to change the web site and to stop giving out bad info since i just blew $500 when all i really needed was the cam and 1.6 ratio roller rockers. Then back in the spring before all of this new Holley crap, i purchased the miniram for fastburn heads! I blew $575 on their chip that i "needed" and come to find with a little research that i can do it myself or go with an Ed Wright chip for half the money. Well, i spoke to TPIS and got a refund! I too went with Jet Hot coatings, very nice i must say, on my Edelbrock headers. Not to mention a full MSD ignition and other things like valve covers and an aluminum/electric water pump. I am also looking at the Moser 12-bolt so that i will have less worring to do with that rear! I am going to spend $1200 for tranny work and converter! All of these things were planned at one point or another but point being, things always change! Bottom line. Always try to research as much as you can before you jump into a project. I got, what i believe, are top quality parts. I was able to buy more since the only labor i am looking at is for the trans. Right now i am doing all of the motor work myself with a friend. That saved me some CASH! When i get the rear i will do that too when work permits. People will say that i wasted my money but i just tried to get everything new and "high performance" for my car. When i get through most of the tunning issues i hope to be running 12's all day with that setup, we'll see. But hey, that is what this "hobby" or "sport" is all about, individuality! I say go for it. It will be expensive as i have just given you a taste as to what i have "blown", but it will be worth it to you in the end. Sure, there are cheaper ways about going fast but i say do what you want. And yes, the faster you go the more expensive it is to get faster and to stay there. Remember v3rbs, if you want to use a blower of some type, you will have to run stronger internals and that costs money as well! If you are looking to do that right off the bat, i say build a motor that is already capable of handeling the forced induction. Sure a bolt on kit will work with the ram jet's stock internals, but if you are going to boost it, do it right! Get some real power out of the blower. Just remember, there are tons of options out there, it just depends on how much you are looking to spend! Everyone will tell you the same thing. good luck on your progress, keep us posted.
Old 09-06-2002, 11:22 PM
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86IROCNJ,


That's what I plan on doing as well!

12s in the 1/4...or at least "kiss" 12.9 just to say I'm in the 12s!

I already spent at least 1000 dollars just in suspension alone!
( there's NO going back now! This car MUST have a V8! lol)

here's what I have already installed ( by me):

bolt on subframe connectors ( will be welded in sooner or later)
Spohn Performance front/rear sway bar kits
( 4130 chromemoly SOLID sway bars)
Spohn Performance lower control arms/panhard rod
( got the 4140 chromemoly upgrade!)
Polyurethane trans. mount and torque arm mount
KYB shocks and struts ( TOO much for KONI, but will see when
my car is done if the KYBs still hold up ).

The springs and strut tower brace is pretty much all that's left to
finish the chassis upgrade. I'll wait for my V8/trans./ rearend
upgrade first, then put those in!

I also just spent $500 for 25th Anniversary Rims too!
I can at least look good for now, go fast later. lol.


I will be rebuliding the entire front end next spring
with all new parts ( including Hotchkis tie rod sleeves)

My total estimate for a very nice street rod :$10,000
Worth every f**king penny!!!!!!!!!!!!!!

telling every Import, Mustang, Mopar that you got beat
by a "stock 305" RS.....PRICELESS!!!!! lol
Old 09-06-2002, 11:45 PM
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Car: 86 Iroc-Z28
Engine: FB385
Transmission: 700r4
I have or had some of the same ideas!! What i would really like is to be able to run 11's N/A by next year this time and then maybe next winter put on an ATI unit, still researching! Right now i have the KYB's and i think the rears may be going! I upgraded to the 2001 SS wheels and sometimes on bumps the fender will rub with the tire causing a scrape mark in the tire, WTF! Well anyway, i spoke to Steve Spohn and once my motor is in i will help to break it in by driving out to PA to see him so that i can have him do my suspension for me! $675 in parts and who knows what for labor! I am dropping a lot of money on this vehicle but by the time i am done i will basically have a brand new car and a lot of the work would have been done by me! I can't wait to get the motor done within the next month! I can almost taste it. well, good luck with your car and take it easy
Old 09-07-2002, 12:47 AM
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That's awesome that your going with Spohn Performance
parts! I'll tell you right now, it's a HUGE Difference! The only
problem I have now is some creeking over bumps. I think it's
because my control arms/panhard rod are "dry". I have to grease
them once in a while. But other than that, The car handles like
a mother!!!! I got the fattest sway bars that you can fit both
front and rear! I can now take sharp bends ( like entering on the
highway) at 60mph plus! I could never do that before! Once I
get my tire/wheel upgrade, it will handle even better! I also have
about 80% polyurethane bushings Under the car, only thing left
is front control arm bushings and motor mount bushings.
BTW, my car is VERY stiff now! And when I'm on the highway,
I get no more "vibrations" at 90mph+!!!
The car feels like I'm doing 50 when I'm really doing 100!!!!

Next plans for the "money dumper":

245/50/16 BF Goodrich G-force tires
on 25th Anniversary Rims

complete front end overhaul

Pioneer 4-way 6x9s with speaker baffles

3.73 Richmond gears with locker setup and rearend support
cover

P.S. I think that since you put on wider/lower profile tires
on it, the clearance has decreased between the fenderwell
and tire. This is just my theory, I may be wrong! That's why I'm
sticking to 3rd Gen Wheels.
Old 09-07-2002, 08:43 AM
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Car: 86 Iroc-Z28
Engine: FB385
Transmission: 700r4
Well, from what i hear he is the best around! I believe it is because he pays attention to detail with these cars since he is not just a manufacturer looking to push product down the line. I was hoping that the handeling would be better. When i reach about 100mph in my iroc it shakes a lot! My 86 civic hb handels 10 times better. When i used to commute to school i wouldn't even realize that i was doing 90-95. Yeah, but my camaro is nuts at high speeds, definately needs some attention. I thought that would be the problem with the tires and wheels, them being larger, but it is not the case. When i first got the ss wheels mounted on tires i put one up to the iroc wheel on the car to see what would be the diffrence for this purpose. Thay are pretty much the same in diameter. And i also know that it is not my springs! Well it could be since i went with the Eibach drag launch springs. From what i hear they are going to be a little "floaty" on the street. I haven't noticed a big difference and the springs barely lowered the car at all. Later
Old 09-07-2002, 04:17 PM
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Yeah my camaro used to shake ALOT at 90+ MPH too! NOT the case anymore. I love the way it handles now! I can take corners
or shift lanes at 100mph and not even realize I did it! You are very smart to go with Spohn Performance parts. When you get your motor done and when you go down to see Steve, I would
suggest that you get the Spohn Performance driveshaft as well.
I think it's worth every penny. Especially since you want to go in the 11s. Me personally, I will be very happy just to be in the 12s.
That way I don't have to worry about my rearend blowing up, and have to put in a roll cage! My max hp rating will probably hit around 400hp, 425ft lbs. when all done. All naturally aspirated for now, maybe in the future I can get an intercooled supercharger
for it with like 10 pounds of boost! Then I'll be hitting like low 12s, maybe even 11s!

Take care....

BTW, let me know how your motor and suspension turn out!
Thanks.
Old 09-07-2002, 05:05 PM
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Car: 86 Iroc-Z28
Engine: FB385
Transmission: 700r4
Hey there, i just got done taking the motor out! That was a pretty good work day, it only took us about 6 hours to do it! Now it is time to prep the bay for paint! After that, it will be time to put her in her new home. With the set up i will be running right now, i have been told that i can expect anywhere from 450 to 470 hp at the fly and around 345ft/lbs. We will see, i'll get it dynoed as soon as it is broken in and tuned. Today was a good day! Well, i'll talk to you later.
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