Find yourself a 350 diesel block install a 425 Forged crank A nice hydraulic roller lifter street cam and roller rockers and you will have a bulletproof 420 inch oldsmobile engine making high horsepower for that trans am ..

Thanks for the video mate, very helpful

Great video Colt! That's just how it goes on these older engines. Sometimes it's a simple freshen up Sometimes its like opening a can of worms. At the end of the day this is going to be a really nice running 403. The paint looks great. Looking forward to the next video. Cheers

@highostablegarage

Жыл бұрын

Thanks means a lot, yeah I wasn’t expecting to do a complete overhaul on this engine but it’s just the way things went haha, fingers crossed it’s going to be a hot ticket 👌

@alexmontico8451

8 ай бұрын

Thanks for your video! I'm now rebuilding a 403, but can't go on because I don't remember the orientation of the rods on the crank. I mean, they are all marked and numbered. I just can't find what side they must be installed on the crank. Could you olease help me? Your help is very appreciated.

P.S., I have built a lot of cars in a barn, machine shed or on the gravel driveway. I would rather see you keep the car inside than outside. Have a great morning and enjoy your day today! Monday or not, I hope it goes flawless today.

Great video. Like the long format👌👌

@highostablegarage

Жыл бұрын

Good to know 👌 next one today isn’t as long but there will be long format videos coming on it

Definitely wanna see part 2 cant wait

@highostablegarage

Жыл бұрын

Part two will be break in and possible drive, fingers crossed no boom haha 😂

@thomaslockley945

Жыл бұрын

@@highostablegarage just keep a eye on oil pressure an water temp an u should be good

i had the same motor and i put a linati cam 5.36 to 5'96 what a big difference. i actually had 4 of these 403's rocket motors.

Good luck with that engine

@user-xo3om9dx6w

9 ай бұрын

Find yourself a diesel block and use a 425 crank and make a motor That's bulletproof with tons of horsepower for that trans am

Nice. I have a 79 trans am myself with a 403 that i custom built. Number 5a heads. 2.25 vaslves installed, scorpion alminum shaft roller rockers. custom pushrods. iskedarien cam. 268 duration with lobe separation. nice idle. arp studded throughout. even intake and oil pan. custom quadrapower q jet. i would like to find an aluminum intake, for heat. i do havea. 4 core huge rad. flowcooler ewater pump and milodon high flow t stat. she stays between 165 and 185. 19 inch fan on heabvy duty clutch. even with the 2.41 diff. smokes the tire off the line and rockets to speed. pulled a 13.9 with the 2.41 axle and just recently found a ws6 disc break 3.23 axle to redo and swap inb. these are fun motors.

@rolltide9547

4 ай бұрын

I know a guy with a similar set up pit a 3.42 posi in it and it picked up. .3 tenths in 1/8 alone.

People who say a 403 is of little point are not engine builders ! The 403 has something almost every engine builder wants ! A massive bore and a short stroke ! Big valve heads as well , 6 deg valve angles ( Honda uses 6 deg valve angles on CRF 450 motorcross bikes , and all high performance engines like Lamborghini,s ) The 403 is light and responds to smsll changes very well , if it was designed with a fordged steel crank, fordged rods, fordged pistons this would have been an unbeatable motor , the things it has from an engine builders perspective is outstanding , the chev guys would love 6 deg valve angles , shit they get a hard on going from standard 23 deg to 15 deg let alone 6deg , chev guys love the " big" 400 chev bore of 4.125 let alone the Olds 403,s 4.351 inch bore , the Chev guys love the destroked 350 to 302 chev because it revs well but the 403 olds has the perfect stroke 86 mm , why do you think this majic 86 turns up sooo much in modern motors ? The Toyota 86, Subaru Impreza WRX 86 mm , Toyota 4 litre 86 x 86 mm bore stroke , and so on all the major performance motors around the world 86 mm stroke same as 403 olds . Even intake port spacing that gives equal shot to all cylinders , chevy guys had to move ports on the Nascar SB2 heads and Ford did the same and what set up was found to be the best ??? The Olds standard port arangement ! And i didnt even mention the standard olds combustion chamber the twin squish design same as the new Ford Godzilla , wich just took the tital away from the Olds 403 as the biggest small block motor at 445 ci . So the Olds 403 probably the best design you could want bar the crap cam and low compression but all the is fixed these days very cheaply , and with those magic new low temp cast iron welding rods we all see on tv being so good and cheap , dont worry about those windowed main webs , sit down one week end and weld them up , ive seen it done and it works very well , bingo a solid main web 403 ! As far as cooling with Siamese bores , those alloy heads from china cost $975 a pair complete , they are an exact copy of Edelbrock ones , alloy conducts a lot of heat and solves any cooling problem on a 403 .

@jeffscott7266

6 ай бұрын

Great analysis on the old Olds 403! How much do those Edelbrock heads cost that you mentioned? Those old engine blocks are great. Can an Olds 403 be retrofitted to 4 bolt mains? Seriously, great comment!

@jeffscott7266

6 ай бұрын

Cool project guys, nice job! To bad you don’t have a 76 or 77-78 Trans Am to retrofit. I mean no disrespect for your work being done at all. As a former 76 Trans Am owner, I never like the 79 nose redesign. Maybe you could put a 76-78 nose on your 79 T/A, I won’t tell 😉. To me the 79 was the beginning of the end in wrecking those beautiful Trans Am body lines of the past models and why it eventually faltered and died due to lack if customer enthusiasm. The Detroit car makers lost their. Minds in the post muscle car era and made some ugly cars until the new retro Camero line began. They should continue that retro trend on the Chevelle, Monte Carlo, Chevy II, Corvette even. Although, the new Corvette is quite the machine now. Everything now has to be worked on with a lift where changing your own oil was made more difficult.

@geranwilson8813

3 ай бұрын

The 403 Is truly the biggest piece of💩 I have ever seen. Did osmobil ever put that thin? in a Hurst or a 442 There's no way in hell that thing is out.Performing a ram air 1-2 or3 And it sure's hell will never and I do mean ever I'll perform a super duty421 428 or 455 Hell I Don't even think that turd will outperform a 389

@JosephCowen-ru7up

3 ай бұрын

@@geranwilson8813 you have no idea on engines do you ? Those bigger engines have small bores and long heavy strokes , for torque, not HP , the 403 has a bigger bore than a 454 big block chev not just a bit bigger a whole 100 tho bigger , the 403 has the magic 86 mm stroke you see in every good motor , the 403 is the same motor as the larger ones , same head design , same bore spacing ECT, the only thing that let it down was smog gear and lightened block , but as any good Olds builder will tell you , they have never seen a stock 403 bottom end let go under 650 HP and if you want more get a girdle from Mondello and go to 900+ HP , as for the smog stuff that's just cosmetic , any engine builder removes intake, carbie, ignition , cam and heads first time you rebuild it so that's a moot point, as stated all good HP engines have big bores and short strokes , that is how you make HP ! The 403 with a bore of 4.351 inches is almost the biggest V8 production car bore of any V8 including all the big blocks ! Simple , I never go on what a standard motor did in its day , I go on potential of its design , and the 403 is the best bore stroke ratio , why do you think the NASCAR Olds block was made to except the 403s 4.351 inch bore ? So they could run a super short stroke and rev it out !

@JosephCowen-ru7up

3 ай бұрын

@@geranwilson8813 can you speak English ??? What was the 403 in , well only the best selling muscle car of the late 1970s the 1976 to 1979 Pontiac Trans Am ! You know the one in the first Smokey And The Bandit movie , that car is a 403 ci 6.6 litre , Auto T350 car doing all those burnouts and smoking the wheels , try that in any other 1977 car !!!!

Use a lapping compound with fine grit and you can get a mirror finish ☑with id micrometers and you CAN get all marks off even if u have to start with a heavy grilk lapping compound.

Yeah, siamese bore 403 runs hot. Actually there was a 4" billet 5140 and 4340 stroker crank. A guy did a 478 ci 403 stroker with one. Mark Remmel is looking at doing a cheaper cast steel crank possibly in a 3.875" stroke.

@w41duvernay

6 ай бұрын

How do you contact Mark Remmel?

i would like to see part 2! is it posted yet?

How much time are we talking, cause I got a 403 with a possible blown head gasket on the right bank, straight outta my 79 t/a. Should I (with no engine building experience) buy a lift, and follow some tutorials and try to do it myself? Or end up forking out 5k or more I don’t have to have it professionally done?

The stock cam should be 187/200 duration at .050. and .400 lift intake and exhaust. You generally need adjustable rocker arms or pushrods with a lift over .500 with an Olds.

Also like the blue color makes it look like a dodge

find an old set of 350 heads from the early 70's,will wake up that 403.they will need redone for the head bolts.

find a set of #5a or 7a 350 heads and change valves to 2.07 1.622 455 valves 455 camshaft will fit. to that point though you would like a main gridle cause the 403 is an open main web block and thats the weak point also oil restrictors under the mains that feed the cam to keep oil flow consistent. that alone will take a smog 403 to decent power not saying push it to hard.

@Knucklehead4400

4 ай бұрын

7a heads are totally useless

boy to me that bearing looked like you got it just in time one over rev. would have spun the crank!! run NO A/C remove a/c radiator buy over sized coolant radiator replace factory manifold with aluminum 4 bbl I like the Rochester carburetor you can get good gas mileage and run dual 4"+ exhaust if you need POWER TO PASS IN 2 SECONDS IT WILL BE THERE😁

Would the bearing damage have caused rod knock when it was running? Im a total n00b.....

@highostablegarage

6 ай бұрын

in this case no, it was caught in time, but if the bearing would have spun rod knock would be a high probability.

What are barrons?

Also video i totally forgot how to get the 45 cross hatch an didn't no that about cam bearings thanks great videos awesome channel

@highostablegarage

Жыл бұрын

Glad you like it 👌

@rodneyhopper22

9 ай бұрын

Yo dude let's just take it to your local machine shop and let them do the right thing for you.

@highostablegarage

9 ай бұрын

@@rodneyhopper22 never learn if you don't try

@rodneyhopper22

9 ай бұрын

@@highostablegarage I just know better than you do but go for it dude

@rodneyhopper22

9 ай бұрын

@@highostablegarage I just rely on people who know what the fuck they are talking about like mondello performance and other professional people who are into building these motors and my knowledge of them as well so sorry if this doesn't agree with you brother because I know what the fuck I'm talking about.

I have a 79 with the olds too, still deciding weather to send it to be rebuilt by an olds specialist or drop an LS in it (sac religious) I know

@user-xo3om9dx6w

9 ай бұрын

Use an early 350 block 70 and earlier or use a 350 diesel block or move up to the 455 do not rebuild the 403 it's a windowed block Like the late 3 50s it's a weaker block it is not meant for high hoaspower use a diesel 350 with a 425 crank and you will have a bullet proof motor And the horsepower is up to you

@peterrivney552

6 ай бұрын

Myself I stay with the olds motors I have a. '67 330 ci forged crank did put cross drilling and chamber used 403 connecting rods shot peened them sliced the crank end on the balancer side 1/2" wide 1000" deep oil relief put oil restriction into the cam debuted the block polished the head oil galleries and cam are of the block for oil return squared up the block, Aline hone, and balanced did a very good porting jod Mondelo style separated the center exhaust ports 7HP gain and blocked the under intake manifold and used clay to protect valve area and melted aluminum ito that area to reshape the exhaust port to match the outer ones (50+) HP then I fine sanded the exhaust ports to look like Chrome the intake was sanded with a course paper to make sure there was no sharp bends the protected the valve area on the intake and gave it a light sand blasting to ruff up lightly to keep the air fuel mixture ran the '70. 350 W-31 valve's are larger and the 308 duration camshaft the 5 quart Toronado oil pan and baffle hi volume pump a few tricks on the timing and squeezed a little over 420 HP out of it ... I also tried the the '70 W-30 stick grind 328 duration camshaft with the higher rpm with the 4-speed My '66 425ci is putting out 525+ HP with the '67 400 turbo with the switch pitch I swapped out a old '67 2-speed jet-away tork converter being smaller than the 400 turbo there were two stall speeds back then low and high stall with the smaller converter I got 2800 on low stall and 3800 on the high stall I put a manual switch on my shifter for the high / low also have manual valve body reverse pattern with trans brake works great for junk yard rebuilds... Taking off in 1st. Hammering 2nd. with the car going sideways and a good 7' of rubber into 3rd. With 4:56:1 posi...

@bennoakes2477

6 ай бұрын

the guys that talk this sort of shit still end up with power levels that didn't bother the windowed mains, stop quoting forum crap to sound clever @@user-xo3om9dx6w

403’s are decent. They aren’t a big block Chevy or a 426 Hemi or whatever and you can’t zing them to the moon, but they can make good power for the street. The best thing you can do with any Olds is get rid of their horrible exhaust manifolds, probably the worst of all the BOP’s and Chebbies. Looking forward to part 2!

@Knucklehead4400

4 ай бұрын

windowed mains wasn't the greatest idea either, i would love to hear the engineers thoughts when they came up with that one

@jimmy_olds

4 ай бұрын

@@Knucklehead4400 weight savings, to lighten up the block, coming off the heels of the gas crisis and now the beginnings of the awful smog days. 1/4 mile times weren’t part of their design criteria, too bad though with that massive bore.

@Knucklehead4400

4 ай бұрын

@@jimmy_olds I know the states reason , but cost benefit , of all placed to take weight. An aluminum hood would have done far more , lighter wheels , the weight savings couldn't have really been appreciable

@jimmy_olds

4 ай бұрын

@@Knucklehead4400 you must not know GM very well. Lol

@jimmy_olds

4 ай бұрын

Especially from that era. Bean Counters ran the corp

Berins 😉

Try to make it run better by painting it for blue huh!

Will this car be for sale? I’m looking for a 79 T/A.

@bennoakes2477

6 ай бұрын

pretty sure you can find one any day of the week in the US for sale locally.

Hey here's what you do with your 403 Oldsmobile motor is use it for a office space table 😅

@bennoakes2477

6 ай бұрын

why be a fuckwit?

looks like a non windowed main web block ! rare block usually come in wagons best 403 to have yey as the cat says 350s are better for your money BUT big bore .short stroke will make a street engine

@jimmy_olds

8 ай бұрын

It is windowed, you can see it when he was talking about the cam bearings.

@bennoakes2477

6 ай бұрын

no such thing, don't spread BS.

A lot off effort just to do things shoddy, same goes for spraying with regular paint, straight over grommets and gaskets that should have been replaced. Back yard hack.

Get rid of ACCEL wires and coil. THERE are better coils out there, you want a coil that makes 60k volts, and plug wires that are 50 ohm per foot, so you can at least gapp the plugs up to .060s, or get better custom S plugs from Torquemaster

The biggest problem with the 403 was SMALL BLOCK PUNCHED OUT TO 403 LEFT LITTLE WALL OVERHEATING was the result and the reason it was discontinued BAD ENGINEERING IDEA!!

@JosephCowen-ru7up

8 ай бұрын

400 chev the same and it was used in trucks in heavy duty hot running situations !

@juanalejandro9877

8 ай бұрын

Agree. Bought a brand new 79 transam with the 403 engine. Experienced the heating problem after a few years.

@JosephCowen-ru7up

8 ай бұрын

@@juanalejandro9877 but you don't get it , from a engine builders point of view , the best V8 ever made , fat or very fat pistons , short perfect stroke 86 mm that ALL performance motors have today , 6 deg valve angles , if you have over heating problems then every 400 chev has the same as both siamesed bores ! Just use a good alloy water pump ? Easy

@juanalejandro9877

8 ай бұрын

Agree. Not knocking the engine. I added a larger heavy duty radiator and problem fixed. Kept my transam for about 10 years before I sold it. Regret selling it.

@jimmy_olds

8 ай бұрын

I’ve had three Olds 403’s and never had an issue, a tiny bit of maintenance was all that was needed. Overheating wasn’t the reason the engine was axed. All the BOP V8’s died around the same time. For whatever reason the Olds 307 though, soldiered on until 1990

A 403 small block olds motor is really a waste of junk, your better off with building a small block olds 350 gas block olds motor or the 350 Olds diesel blocks at least with the diesel blocks you can make it in to a different combination with the right parts

That’s the dirtiest engine build I’ve ever seen, but hey we’re on a budget.

@highostablegarage

Жыл бұрын

Someday who knows, maybe we will have lab coats haha 😂

The 403 motor in my own personal opinion is a big waste of money and time,go ahead and find a 350 Oldsmobile motor block and your gonna be a much more happier person believe me

@bennoakes2477

6 ай бұрын

I don't believe you.