455 olds

O

overbored

New member
I have seen 65 in mine but that was absolutely perfect conditions without any weight in the boat including the back seat. I also have nothing special engine wise.
 
G

Gold Member

New member
Well I'm going to build one for my tx-19. IM going to work the heads as much as i can to try and get enough air flow to make power to 6,000rpm. If i can it should make close to 600hp. I'm wanting to put a 150hp shot of nos on top of that and it should run 90-95mph on with an A-impeller. :smile24:
 
N

Nitro Neil

Member
There are Olds builds that make 650-850 hp.  Strokers to 425 Olds. Heads, intake, cam, and pistons. It will take 6000 rpm plus
 
G

Gold Member

New member
if anyone has any help on achieving this please post? The heads suck but i will play with them on the flow bench and see what i can get out of them. I think it can be done :smile29:
 
Last Mohecian

Last Mohecian

Administrator
Why would you do that?  To get an Olds to spin that kind of RPM you are going to spend way way way more money and it will not be near as reliable as a BBC or BBF.  Olds motors have  severe oiling deficiencies with sustained RPM's over 4K.  To spin one 6K is going to be extremely expensive.

This article will be a good place to start.  You better have some deep pockets.
http://classiccustomboats.com/pages/practical_olds.pdf
 
G

Gold Member

New member
Yeah the oiling system has issues but nothing i cant handel. the motor i have came out of my first tx-19 that i never ran. it has all that trick stuff done already. i just want that 4.250 stroke without paying for stroker kit. i want a torque motor.
 
Last Mohecian

Last Mohecian

Administrator
Olds motors makes a lot of torque down low.  It's that 6K that is going to be hard to get.  Does it already have an adjustable valve train?  Man,  Good luck.  It can be done just damn expensive.  That article has a lot of good info in it.  It was written by Tim Jurincie.  He posts as Timinator over at PerformaceBoats.com and screamandfly.com  He is always answering questions and willing to talk on the phone.  I'd join one of those boards and PM him.
 
Devilman

Devilman

Well-known member
Kevin (Taylorman) had a nice Taylor SJ with a 455 that would run 70+ easy. That was on a single carb motor, no nitrous or anything. I do remember that he had done the oil mods(restricted pushrods, external drainbacks, etc.) He hasn't been around in awhile though. I know that ain't much info, but mainly that they can be made to run...
 
K

KONA77

New member
Last Mohican said:
Why would you do that?  To get an Olds to spin that kind of RPM you are going to spend way way way more money and it will not be near as reliable as a BBC or BBF.  Olds motors have  severe oiling deficiencies with sustained RPM's over 4K.  To spin one 6K is going to be extremely expensive.

This article will be a good place to start.  You better have some deep pockets.
http://classiccustomboats.com/pages/practical_olds.pdf
Click to expand...


gonna have to agree with Last Mohican here.... if you don't do the oiling mods on it,  gonna have more nightmares than you want.... need to build a BBC or BBF... i prefer the BBF myself,  especially if you do the head work ..... much cheaper..... but thats me
 
O

overbored

New member
Visit the Mondello website. It has a wealth of knowledge to help you get to your goal. I myself have settled on the idea of changing over to Chevy this winter. You can push those motors to a 468 by boring them. That was my plan but I already have a couple Chevy motors sitting around I need to do something with. Besides that- the price of building a Chevy is much easier on my wallet. The main thing is gonna be careful part selection and getting in with the right people.
 
W

WAFOBABY

New member
Well Boddy I see you are still stuck on that 455 Im telling you Like everyone eles is the money you are going to spend on the old you could build on bad A$$ BBC.  THinking about buying a stroker kit for mine and building a 496 this winter also..
 
Cookieman

Cookieman

New member
My first jetboat was a Taylor SJ with 455 olds. I can tell you oiling was a big problem. You will need a big oil pan, oil restricters, and parts are hard to get. The next thing I could say would be with the horsepower and speeds you are looking for ....... make sure your hull will take it. You may find the ride rough ir you don't have the right hull. If you are dead set on your 455 , like most of the guys have said you better have deep pockets.
 
B

blazeracer

New member
I read that article Matt posted last night about building a high rpm 455. Looks like two main problems with that motor is the balance of it and oiling. In the article it stated an average big block will be 6 grams out of balance on the rods and the 455 they used was over 25 grams off in some areas, so the stock stuff was out. Too much to remove and keep it strong. Then the machining for the oil pressures and flow at high RPM is another beast to tackled. BUT, it can be done. find the right machine shop and I cay go for it and give all those Chevy's the what for....

But good luck beating my Ford.. haha - Had to throw one jab in there.

Actually, turbo or not, I will probably be sporting a 6 liter injected LS2 running open loop in my Glastron next year. Economically, durability, availability, and power potential make it the best choice for a swap IMO.
 
Last Mohecian

Last Mohecian

Administrator
You have to remember.  That Olds platform died a dismal death in the mid 80's with the last incarnations being a 350 Cu In diesel and a 260 Cu In gas motor.  In hind sight I'm sure GM would like to erase both of those pieces of history.  The last real performance Olds 455 was pre 75 before all the emissions equipment was added.  That was 35 years ago.  It's been a long time since there was a real demand for performance Olds V8 parts.  All this adds to the cost and poor availability of Olds parts today.
 
4SPRAT

4SPRAT

New member
Okay, time for my 2 cents.  Mike from Dallas area has a 76 SS with a 455 that runs like a freakin champ!!!!!!  No oiling problems, stock pan i believe - not positive.  His main mod was smoothing and opening all internal oil drain backs AND drilling the back of each head and installing drain back hoses from head to the rear of the oil pan.  I rode in this boat at broken bow with gps (think it was 66-67 mph) and he held on the floor for a good 2 minutes AT LEAST...oil pressure solid as a rock!!  No issues.  The 455 can pump the hell outta the oil, just can't get it back to the pan. 

Yes the parts (pistons, gaskets, cam, etc) in general are more expensive but the torque is nice.  Especially if you have a jacuzzi pump with that big nozzle.  Holeshot is awesome!!  :grin: 

Heads can be made to flow fairly well, or you can buy aftermarket heads.  I believe you can replace the rope seal with a 460 ford seal.  ...there are quite a few little things you can do to make it better than bone stock that really aren't that expensive or difficult (ex. drain back hoses).

Nothing wrong with an olds, just a little more pricey.  Fords aint cheap either.  And if you don't care about spending money then you go buy a stroked 454 sbc from motown, and super charge it.  Put some jacketed headers onit.  BAM!  Lighter, and just as powerful.

And if you have the money and you want unique nostalic torque, then put a caddy motor in it!  LOTS'O torque and at like 25 rpm or something REDiculously low.
 
G

Gold Member

New member
Well its like this guys i want to run fast with an A impeller so i can cruise at lower rpm and have a good hole shot. i know i cant get the hp of a well built ford or chevy, but at 5500 rpm i will unless you stroke them. I am a ford man my self and would love to put ford in it but i would spend more money by the time i bought headers and stroker kit. i already have all the machine work that fixes oiling problem done. forged pistons, and the good heads. if i can get 275 cfm out of the heads it will make 598hp at 6k rpm. not enough to turn an A impeller 6k rpm but with 150 shot of laughing gas it will! I WONT BUILD A CHEVY!!!! rod ratio sucks when you stroke them! Cant fit long enough rod in that short deck.
 
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