426 Small Block Questions

Posted By: AKMUTT

426 Small Block Questions - 07/12/12 12:14 AM

Hi
I am thinking about building up an 426 small block for my Challenger.
It will be based on an R3 block bored to 4.25 with an DragonSlayer 3.75 stroke crank.
Has anyone on here built up an engine like this?
Or have information on who to contact about setting up this combo.
Also the engine would be need to be able to handle large amounts of NOS as my engine now does.

Attached picture 7288085-P9210156.JPG

Posted By: w2stroker

Re: 426 Small Block Questions - 07/12/12 12:20 AM

call Brian (ou812) imm engines 760-347 5493 indio california
currently finishing off my 437 inch r3

Posted By: AndyF

Re: 426 Small Block Questions - 07/12/12 01:55 AM

There are a couple of 427 small block articles on my website. www.arengineering.com then go to the tech article section.

Posted By: Hot 340

Re: 426 Small Block Questions - 07/12/12 02:00 AM

Youll probably want to sonic the block at 4.250...Id stay a little smaller, rigid walls make good power.

Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 02:10 AM

Thanks for the infromation

The thing that I am thinking about is the engine being based on an 3.75 stroke.

I have an 4.00 stroke engine now and know that a small block can be buit up to an 472 with 4.25 stroke

I am just thinking of building something different, shorter stroke and large bore.

Posted By: DJVCuda

Re: 426 Small Block Questions - 07/12/12 02:12 AM

I went more stroke and less bore to get 430 cubes on an X block.

I'm testing a few variations of the motor now but i posted the stock head, air gap / small cam setup LINK HERE

Posted By: Leon441

Re: 426 Small Block Questions - 07/12/12 02:19 AM

4.250 has been done. Both of the ones I know of were filled. I ran lots of NOS. I would definately 3/4 fill the block.

The reason I went to this bore was for a ring I needed. You can get nitrous rings for more bores these days. 4.200- 4.220 would be a safer choice. But, I like bore too.

Posted By: DavidDean

Re: 426 Small Block Questions - 07/12/12 03:10 AM

I'm working on my big SB. X block tall fill 4.125 bore 4.250 BPE (Rod Bloomer)crank (nice rotating assembly). (Brian) IMM Indy 360-1-245 cnc (good looking heads).Both of these guys have provided some really nice parts.Yeah its a 454.

Posted By: dusturbd340W5

Re: 426 Small Block Questions - 07/12/12 04:13 AM

I would use less bore and more stroke that leaves you room on the bore later on If and when it comes time for a fresh set of slugs.

Posted By: MR_P_BODY

Re: 426 Small Block Questions - 07/12/12 05:14 AM

Quote:

I would use less bore and more stroke that leaves you room on the bore later on If and when it comes time for a fresh set of slugs.

I would go 4.185 bore(common chevy piston)
with a 3.79 crank but have the rod journals cut to
chevy but off grind it for more stroke if you want

Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 05:20 AM

Quote:

Quote:

I would use less bore and more stroke that leaves you room on the bore later on If and when it comes time for a fresh set of slugs.

I would go 4.185 bore(common chevy piston)
with a 3.79 crank but have the rod journals cut to
chevy but off grind it for more stroke if you want

Thats what I am looking for
Common parts to make a great combo without having to have crank, rods, and pistons all custom made.

Thanks

Posted By: MR_P_BODY

Re: 426 Small Block Questions - 07/12/12 05:28 AM

Quote:

Quote:

Quote:

I would use less bore and more stroke that leaves you room on the bore later on If and when it comes time for a fresh set of slugs.

I would go 4.185 bore(common chevy piston)
with a 3.79 crank but have the rod journals cut to
chevy but off grind it for more stroke if you want

Thats what I am looking for
Common parts to make a great combo without having to have crank, rods, and pistons all custom made.
Thanks

My W-9 is just 405ci... thats a 3.79 stroke with
4.125 bore (common chevy piston also) with 6.125
chevy H-beam rods... I wish I would have just went
with the 4.185 bore to unshroud the valves better

Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 05:37 AM

Quote:

Quote:

Quote:

Quote:

I would use less bore and more stroke that leaves you room on the bore later on If and when it comes time for a fresh set of slugs.

I would go 4.185 bore(common chevy piston)
with a 3.79 crank but have the rod journals cut to
chevy but off grind it for more stroke if you want

Thats what I am looking for
Common parts to make a great combo without having to have crank, rods, and pistons all custom made.
Thanks

My W-9 is just 405ci... thats a 3.79 stroke with
4.125 bore (common chevy piston also) with 6.125
chevy H-beam rods... I wish I would have just went
with the 4.185 bore to unshroud the valves better

I tryed to send you a PM but it did not work
Could you send me a PM so I can reply to you
Thanks

Posted By: MR_P_BODY

Re: 426 Small Block Questions - 07/12/12 05:42 AM

sent

Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 07:28 AM

here is the engine now

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Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 07:30 AM

building the engine

Attached picture 7288713-P4250004.JPG

Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 07:33 AM

the trunk the fuel cell is below

Attached picture 7288714-P7100011.JPG

Posted By: Streetwize

Re: 426 Small Block Questions - 07/12/12 01:26 PM

Il ike the short 3.75 stroke combined with a big (but not maxed out to preserve bore rigidity) for a Nitrous combo, run as long a rod as the deck and pin combo will let you for a nitrous slug (typically lower set ring pack).

Normally aspirated I'd go 4.185" (common .060 over 400 chevy or 455 olds size) and a 4.125 stroke. save some bore thickness for next time...or next couple times. The biggest bore possible theory is less critical now than it was before the big flowing heads we have today were readily available.

The 'magic cube' numbers (like 426 and 440, etc) are novel and I suppose 'stylish' for conversation purposes but if there's no other reason.....

Posted By: MR_P_BODY

Re: 426 Small Block Questions - 07/12/12 01:38 PM

Those little air cleaners have been known to really
screw up the air flow to the carb... I would off that
and get something better(I know you are trying to
clear the hood)

Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 07:58 PM

Thanks for the information about the crank and deck hight.
This gives me something to work off of.

(And yes I am using that air cleaner to clear the hood) Haven't found another one that will clear

Posted By: AKMUTT

Re: 426 Small Block Questions - 07/12/12 08:03 PM

Quote:

Il ike the short 3.75 stroke combined with a big (but not maxed out to preserve bore rigidity) for a Nitrous combo, run as long a rod as the deck and pin combo will let you for a nitrous slug (typically lower set ring pack).

Normally aspirated I'd go 4.185" (common .060 over 400 chevy or 455 olds size) and a 4.125 stroke. save some bore thickness for next time...or next couple times. The biggest bore possible theory is less critical now than it was before the big flowing heads we have today were readily available.

The 'magic cube' numbers (like 426 and 440, etc) are novel and I suppose 'stylish' for conversation purposes but if there's no other reason.....

I was thinking of the 426 size for the "426"