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451 build

Posted By: bigblock4x4

451 build - 02/19/13 01:46 AM

gonna build a 451,here's what i got,ported heads,they flow [Email]260@.550[/Email] lift.2.18,1.81 valves,m1 intake,800 holley,1 3/4 headers,and i'm gonna use a mopar .528 cam,also the heads have been milled they are 80 cc's chamber and the pistons are at 0 deck height,any ideas what this thing make horspower wise?this is my first stroker build so i'm winging it.thanks,it's going in a 3/4 ton truck for the time being.
Posted By: 383man

Re: what do u guys think - 02/19/13 04:27 AM

Well my old 446 was a .030 over 440 with 906 heads and the MP .557 cam. It use a Holley Street Dominator intake and a 850 DP and was 10.0 comp. Ran fine on pump gas as I used the KB quench pad pistons to get quench. It also used 1-3/4 headers. I never dynoed it but it ran a best of 11.49 @ 116 in my 3700 lb 63. I would guess it was about 500 flywheel hp. Ron
Posted By: bigblock4x4

Re: what do u guys think - 02/21/13 05:01 AM

started clearancing the crank tonight
Posted By: DaytonaTurbo

Re: what do u guys think - 02/21/13 06:32 AM

with the mp528 cam and those heads, I would say right around 500hp.
Posted By: HemiRick

Re: what do u guys think - 02/21/13 07:43 AM

U using a forged or cast crank? I built my 451 w a cast and clearancing needed was minimal, just a little grinding on the block. I didnt have the crank cut down and it was minimal work to balance with 440source Hbeams and Ross pistons.
Posted By: AndyF

Re: 451 build - 02/21/13 05:17 PM

No reason to wing it, I wrote an entire book on building stroker big block Mopar engines. $20 at Amazon or Mancini Racing.
Posted By: bigblock4x4

Re: 451 build - 02/22/13 01:38 AM

i am using a steel crank,and i am using the shorter 400 rod so i had to do some clearancing on the crank with the piston that i am using.
Posted By: Dan Halen

Re: 451 build - 02/22/13 02:07 AM

Quote:

i am using a steel crank,and i am using the shorter 400 rod so i had to do some clearancing on the crank with the piston that i am using.



I just did a 400 block with KB quench dome pistons,Eddie heads and a

Racer Brown SSH-44. Haven't put it in yet but I know of a few others

with this combination and it works good.




Posted By: dart4forte

Re: 451 build - 02/22/13 02:32 AM

Quote:

gonna build a 451,here's what i got,ported heads,they flow [Email]260@.550[/Email] lift.2.18,1.81 valves,m1 intake,800 holley,1 3/4 headers,and i'm gonna use a mopar .528 cam,also the heads have been milled they are 80 cc's chamber and the pistons are at 0 deck height,any ideas what this thing make horspower wise?this is my first stroker build so i'm winging it.thanks,it's going in a 3/4 ton truck for the time being.




So, how many inches of vacume did you flow those heads at?
Posted By: bigblock4x4

Re: 451 build - 02/22/13 07:05 PM

i wasn't at the shop when it was done,he is a very smart individual up north,i trust him.that's all i need too know,i would assume 28 though


So, how many inches of vacume did you flow those heads at?

Posted By: dogdays

Re: 451 build - 02/22/13 11:48 PM

Generally speaking, if anyone is quoting head flow it's at 28", as anything less would look low.

260 peak flow from a set of stock ported B heads is a pretty nice job, but not max porting. Of course, when one compares that with the 250cfm STOCK peak flow from a 5.7Hemi head, it starts to look a little weak.

R.
Posted By: Dean_Kuzluzski

Re: 451 build - 02/22/13 11:53 PM

Quote:

Of course, when one compares that with the 250cfm STOCK peak flow from a 5.7Hemi head, it starts to look a little weak.



True. But if you're starting with a big block wedge powered truck it's probably less time & money to build a budget built, low reciprocating mass, 451 than a 3rd Gen Hemi. Or even if it's a smallblock now, the brackets, trans, etc are still cheaper.

Not trying to start sumthin', just sayin,!
Posted By: bigblock4x4

Re: 451 build - 02/23/13 05:00 PM

truck already has a 440 in it,just wanting too try building a 451,i think it would/should be more FUN,the 440 is healthy,but i think the 451 should b more healthy.money is a restraint,so taking baby steps,little at a time,just upgrading a little.i have been accumulating parts for this build for a couple years,got the pistons rods and crank and block and heads,hopefully i'll find some more parts at the indy swap meet in march,oh yeah!
Posted By: bigblock4x4

Re: what do u guys think - 02/23/13 05:05 PM

Quote:

Well my old 446 was a .030 over 440 with 906 heads and the MP .557 cam. It use a Holley Street Dominator intake and a 850 DP and was 10.0 comp. Ran fine on pump gas as I used the KB quench pad pistons to get quench. It also used 1-3/4 headers. I never dynoed it but it ran a best of 11.49 @ 116 in my 3700 lb 63. I would guess it was about 500 flywheel hp. Ron

i'd like too find a used set of those pistons
Posted By: Brian_wo

Re: 451 build - 02/25/13 05:55 AM

Quote:

No reason to wing it, I wrote an entire book on building stroker big block Mopar engines. $20 at Amazon or Mancini Racing.



hey 451boy
whats your book called? I have built a few of these and might be building another but want to do it a little different from the last few,always looking for ideas.
Posted By: Triggerfish

Re: 451 build - 02/25/13 03:30 PM

Low deck strokers are a great motor & yours should make some power,
but in a 4x4, low end torque is a must, especially if you have big off road tires. Ask me how I know! I sold the 451 torque monster I built for my Barracuda & installed a 70 383 mag with a little smaller cam than yours (power band was 2500-6500), stock 906's, and with the
35x12.5x16.5 BFG's on my 71 Power Wagon (3.55's), street manners sucked! Low vacuum, lotta gas to get it rollin. Wasn't much fun. I just installed a small Comp cam & new 906's and its a different truck.
If you've got 4:10's or lower & a stick, it might be more street friendly. Just my 2 cents. Your build should make 500 if the heads don't hold it back a little & should have mid 500's torque, too.
Best of luck with your build.

Attached picture 7602678-OrangePeeldriverssideweb.jpg
Posted By: BadMoonRacer

Re: 451 build - 02/27/13 12:50 AM

Here is that book being mentioned.
http://www.amazon.com/Build-Max-performa...dy+finkelbeiner

I own a copy and have found it very useful. It should belong to any good library devoted to Mopar literature.

Regards

Ragnar in Iceland
Posted By: Brian_wo

Re: 451 build - 02/27/13 04:51 AM

Quote:

Here is that book being mentioned.
http://www.amazon.com/Build-Max-performa...dy+finkelbeiner

I own a copy and have found it very useful. It should belong to any good library devoted to Mopar literature.

Regards

Ragnar in Iceland



Thanks
it is because of Andy (451boy) that started building low deck strokers,since then did a small block and even a modern Hemi
Posted By: bigblock4x4

Re: 451 build - 02/27/13 06:55 PM

Quote:

Low deck strokers are a great motor & yours should make some power,
but in a 4x4, low end torque is a must, especially if you have big off road tires. Ask me how I know! I sold the 451 torque monster I built for my Barracuda & installed a 70 383 mag with a little smaller cam than yours (power band was 2500-6500), stock 906's, and with the
35x12.5x16.5 BFG's on my 71 Power Wagon (3.55's), street manners sucked! Low vacuum, lotta gas to get it rollin. Wasn't much fun. I just installed a small Comp cam & new 906's and its a different truck.
If you've got 4:10's or lower & a stick, it might be more street friendly. Just my 2 cents. Your build should make 500 if the heads don't hold it back a little & should have mid 500's torque, too.
Best of luck with your build.

triggerfish i want ur truck,awesome.i am gonna put the 451 in my fourwheel drive,but would love too find about a 65 66 shortbed truck too put it in,and go out and stomp some mustang and camaro tail,thanks for the awesome feedbacks everyone
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