The water jacket mods are pretty neat looking.

 

I designed this as soon as Mark came up with 4.0” crank. I got one of the first 3 cranks. I looked and studied every girdle available and BTR was the obvious choice. I build all my own stuff but being that Bill would have to take his big block girdle and adapt for a small block I decided to just get him to do the engine. He was amazed at the power this combo made even after the first pull. There’s a lot more in it but it’s more than I need for what I was trying to achieve. I don’t know of ANY pump gas small blocks that have made near this power. I cannot thank Mark enough for the crank, Bill for taking this project on, and to all the 403 haters, you can now eat your own words. This is a 496 killer plain and simple. I can’t say right now, but after texts, fb messages, phone calls after it was dynoed, some things are in the works. If you are building a sb, by a crank from Mark. Thanks for the compliments!

 

Hold on.......thats not going to kill my 496s or 475s. You can call it a small block, but it is 484 cubic inches, and I do like your idea using the big bore with a 4 inch stroke, I agree with this approach. I myself do not hate 403s, based on what I've seen in NHRA stock it would seem this could live. Common sense would mean using Bill for the build. Could you describe the car and weight this engine is going in, and the performance you expect? Best build I've seen on here other than the short stroke 403 in the link, good luck.

 

My 478 sb made more power on pump gas than I’ve seen any other pump gas build, correct me if I’m wrong with proof. Car is a street hence pump gas. 83 HO with AC, and all the street car luxuries ( I’m spoiled) easily a mid 10- second car driven to the track. Best running pump gas 496 I know of has run 10.80’s

 

Dan

I think you mean "Oldsmobile" 496-484s in your posts, sorry for the misunderstanding. I'm sure you will meet your goals of a 10 sec NA street driven Oldsmobile. Let us know what it runs!

 

well....this is classic Oldsmobile not classic Chevy

 

I got that......nice build.

 

Just got off the phone with Bill and he said "that build made me rethink some things."
So, Dan, congrats! Getting Bill to change his mind is one hell of an accomplishment.

He also called Mark's crank "pretty good", which is about as good a compliment as he'll ever give.

Good work guys!

Mark, was that a 4.371 bore? Able to find good rings at that size?

 

So for this build the power is excellent, and its great that it runs on pump gas. Looking at the build what is it about it that seems to make it make more power than would be considered normal? Is it the stroke? Is it the Stroke combined with heads/cam?

Asking as I have my own build coming up and of course would love to apply the lessens learned on this build to mine.

 

I knew with what I had thought about, it would make power but not as much as it did. Bore us 4.362

 

That girdle has to be the #1 reason the "windowed" engine will last more than 10 minutes, and certainly the stroker crank from Cutlassefi helped. The power is impressive.

 

As Dan mentioned bore is 4.362, virtually the same as a 460 Ford, so a +.005 set will work fine.
And I changed the crank a little since the first batch that Dan and I got. I removed all the blind holes in the front main journal and increased the radius on both the rod and main journals. That should make it even stronger.
Thanks.

 

Dan

Any flow numbers on the heads?

 

Windowed 403 blocks have lasted in NHRA stock eliminator and Super Stock trim for years, maybe a Super Stock combo can use a girdle? But in NHRA stock trim the 403 makes nowhere near the HP that Dans 484 makes.

 

Dan, you always inspire us 403 guys, that will be insane. I plan on at least getting my 403 based 424 short block together this year, just an offset 330 crank build with a Halo, going in my 70S. Macar1993 just had major failure but a 403 crank and a T-56 manual means double trouble.

 

I remember that build well but questioned several things. The biggest thing was cam with that compression. I think it’s way over cammed.

my 478 was design by me, after mark made an affordable crankshaft available. The obvious choice for the girdle was BTR. It’s a billet piece. There’s really nothing at all exotic about my engine, other than Bill took his bb girdle and made it work. He did an amazing job on the heads as is everything. As I said before, I lean heavy on the conservative side of builds because I want my stuff to last. The cam is fairly moderate, steel rods, basically you could pick up the phone and buy everything in it except pistons and crank with 1 phone call. The block is NOT filled. An engine dyno is hard on an engine vs in the car, so I believe it will last along time, make bb guys cry, and the 403 haters hate even more 😂😂😂😂😂

 

It carries the power pretty good past peak HP, very important when it comes to drag strip performance. When your only looking for 10s its not as important, but I'm sure the builder was looking to go much faster. Looks to me average power throughout a pass would never falls below 670 HP. Does anyone know if this 463 made it to the track?

678 HP
136 MPH @ 3500 pounds
1320/136 = 9.70

 

Dan, you made us all very proud ! I've been into 403's since 1985 and have one of the 2nd batch of these cranks. Really appreciate all of what you have done. My 2004R's are modeled after yours too.

 

The 463 was going into a road race style of car.

 

Dan I sure wish we could try something like my dry sump girdle on your 403!

 

This ^ so this doesn't happen LOL

v

 

Dan has a BTR girdle on his 403 so I’m sure that it’s more than up to the task in keeping it all together. I was just talking about mine being a dry sump setup vs the normal wet sump.

 

So did this one above. Not Bills work above though. Its a shame they had to build that big bore block with compromises. It seems all production blocks from any manufacturer has something thats no good, thats the problem with production parts.

 

No it didn't. It had a halo. There is a difference.

 

Could you post pictures of each? Thanks

 

You could just look at the other photos in that thread you stole the photo above from and see it for yourself, then compare to what is on Bill's website...

The difference is obvious - one ties to the caps to the block and requires oil pan modifications, the other doesn't.

Since VTP was rude enough to steal a photo without credit or citation: https://www.tapatalk.com/groups/real...ld-t16955.html

 

Yes....there is a difference.

 

Changes are coming!

 

Oh he’s done that before. Before ROP crashed this last time he had a pic on there of an Olds iron chamber welded up to look like a true wedge shape. Problem was it was a pic in Harold Bettes’ book that he took credit for. Dale (GMRocket) called him out on it. Nice to see he’s consistent!😉

 

You consistently have your facts wrong. Some of the pictures in Harold Bettes's writings come from my shop. Welded cast iron is a common occurrence at my shop. Consistently fast.

 

Lucky for you that old post doesn’t exist anymore, because that’s not what came out in the end.

 

I am excited to see what you come up with!

 

Jeff Kazista went 10.40s with a 490 (4.165 bore) on pump gas.

 

For a minute I thought I was on the original realoldspower

BTR
http://btrperformance.com

JSMachine
http://www.jsmachineoldsmobile.com/PRODUCTS.html

The limited quantity Noel Sevigny Girdle
https://classicoldsmobile.com/forums...smobile-40148/

 

10.75 dammit!
I took the floor mat’s out of it this weekend and ran a new PB!

 

Last 10s car I was in as a passenger. Was a scary ride I'm not ashamed to admit.

 

Saw your new car over on YellowBullet, looks good.

 

Congrats to Dan and Bill on an impressive SBO stroker build.

 

Thank you. I had a thread here on it too but for some reason I started having trouble posting pics here so I gave up.

 

Now that made me laugh!