v8mk1mr2

Just a quick question guys.
I was letting my fingers walk around earlier checking out what is out there as far as big blocks go, and i found a lil kewl lil toy. It seems that World Products has a Merlin Pro Block out that is based off of the Merlin III block. Anyway, this new block comes with an optional 11.625" deckheight, up to a 4.625" bore w/ remaining "nominal .400" wall thickness." It also can take a stroke of up to 5.850". Lil calculation, and boom, that is a 786.247 cubic inches!!!! My question, does anyone out there even make a BB crank with a 5.85" stroke!!!???? I did some research, but all i could come up with in the big range is Callies Magnum Plus BB crank topping out at 5.5" and the Lunati forged crank topping out at 5.4". Does a 5.850" crank exist? BTW, a 4.625 bore w/ a 5.5" stroke still comes to a whopping 750 cubes, mind you, that is 12L. Sorry, i have to say this, can any of you imagine having a nice, clean, unsuspecting fourth gen with a lil sticker on the side, or the cowl hood that says "12.0 L"? sorry, just had to ask....

Stephen 87 IROC

You won't see many of those engines taken right out to the maximum mainly because of the exotic parts required. The most common size is a 632. That uses a 4.6" bore with a 4.75" stroke which uses parts that are commonly available.

OldSStroker

If I saw this I'd be looking for the 6.0L LS1 under the hood, and the other one in the back seat.

I went to college with a guy who had 2 Ford Y-blocks in his '56 Ford daily driver (this was in the 60's). Usually only ran on the front one, but for fun he engaged the rear one also. Used a boat V-drive I think. When you went cruisin' with him, odd men out got the rear jump seats!

Yeah. It was a nerdy engineering school.

Jimmy17

i beleive i saw a listing for a 6" stroke bryant crankshaft once
still, i'm sure its a one-off product, costly

i imagine thats for matching up to the 5.0" bore space blocks with deck heights up to 12.8"
gets up into the 870 cube range
but nobody really builds bigger than 815cid right? for prostock and various nmra classes

v8mk1mr2

Just for the sake of gaining the knowledge: What company makes a block that can handle a 5" bore with a 12.8" deck height?

WickedFast555

They're really aren't many 'off the shelf' parts that fit a 780-815" engine. A decent P/S 815" that could actually qualify at a race makes a little over 1600hp N/A and costs around 100k. A 'budget' 706" bracket engine goes for around 60k. You need deep pockets for engines in this league. Thats why I recently went with a 632", its easier on the pocket book, but by no means cheap.

Jimmy17

http://www.cnblocks.com/5inbbc.htm

not 5" bore, but bore spacing, which allows up to about 4.8" bore
with 6" stroke (if i didnt just imagine that) would be 869 cubes

v8mk1mr2

Wow, that is one kick a$$ looking block, too bad its $8500. If i am not mistaken, the World Products BBC Pro BLock says it can be bored to a 4.625" bore with a nominal wall thickness of .400". Wouldnt this mean that the block spacing for the cylinders is 5.025"? Yeah, its only a 11.625" deck height, and says it handles a 5.850" stroke, but i am sure if you are willing to, you could chance a 4.8" bore(considering you can get an all steel block), and i am sure you could clearance the crank for a 6" stroke. I am guessint the block costs a lil under $3000 or right around that. That is 1/3 of the CN Blocks cost. Am i missing something, i dont mean to rag on ur post in any means, becuase i am just trying to broaden my knowledge. thanks for all the help guys..

ru2slo_99

If you are going to build a motor that big, you will probly have the money to buy the right parts. An all out mountain motor is not where costs can be cut. If you are worried about price then building a smaller motor would be the way to go.

93Z286Speed

ive seen an engine in the 830's i belive it was an 836 not 100% sure on the 3rd number

and who uses a 706 inch bracket motor?!? top dragster usually uses a 632 on the bottle, dont think ive ever seen someone use 700+ in a bracket only car, unless a door car, like top sportsman. But that usually is also a Quick 8/16 car

SStrokerAce

I've seen those things in person, bad thing is when you ask about hot honing them they have no clue what you are talking about and say it's just BS anyways. Makes ya wonder why a aluminum block manufacture would think that.

Hey you can get a 572 into a "production" based block anyways so why not stick to that. The big problem with those BIG motors is the heads! They are out there but they are not cheap.

Bre

WickedFast555

You hit the nail on the head, T/S and Q16 door cars use the 700inchers sometimes. 6 second bracket racing with a 'glide, gotta love it! Jeggie Coughlin actually started the trend back in '91, running a 711" in super gas. He pretty much started the big MPH super class wars. Its crazy to see guys running 185-190MPH just to go 8.90 these days in super comp. When will the madness end?!!

93Z286Speed

thats pretty uncomming.. that kinda MPH for supercomp.. well any of the NHRA/IHRA races ive been in.. usually highest reap speed is 180-175.. most around 160s

v8mk1mr2

Well here is why i care at all guys....based on relevancy to the original post...: I recently decided to take my 94z off the road and buy a lil commuter car. Although i am a huge car and camaro enthusiast, i have a nuckle brained idea to build up what i consider a nice car. I have recently decided, after about a year of thinking on the subject, that i am willing to take however long or however much money as needed to build this car. I now look at it as a project for what I think a supercar should be. I can go into tons of details on what i think the car should be and what i plan on incorperating into the car, but that should probably be a separate thread, and i am not sure it would be discussed in advanced tech anyway. I am willing to wait until i earn the money needed to get custom parts if need be! The heads: I plan on designing custom heads and valvetrain for the car anyway, so head size/head bolt pattern is not a concern. Last thing, i do not plan on competing in a drag class, I will take it to the track every now and then, but basically want it as a car that i can cruise on the weekends with, go to the track when i want to, and just have a supercar for what i am guessing will be anywhere from $100l-$200k. So it might take me 10 years to finish the project, but i have set goals, and i intend to stick to em. Hell, it takes some people until they are 50 or 60 years old to get their dream car. This might not turn out to be my dream car, but it is a dream, and it will be a very unique, one of a kind supercar. You can either tear apart my idea, or u can support it. To me, it doesnt matter what you do, i know what i am going to do, but thanks very much for all the info you guys provide me with!!!

Much Thanks,
- T.

SStrokerAce

Man that's a big goal, might want to pick up a Brodix catalog and look at the monsters in there that flow 540cfm. That would prevent me from designing my own head.

Hell my dream car is a tankster (yeah that's my term) basically a belly tank lakester street car that is part 67 F1 car and part hot rod. Something like the new SoCal LSR Ecotec powered car but for the street with a Busa motor in it instead. Hey we all can dream.

Bret