Thread: Give your opinion on this BB build

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454 block 60 over

427 crank

7/16 rods

arias dome top pistons 11.5

comp EX284H 574-578 lift 240-246 duration

781 heads, 2.19 intake and 1.88 exhaust

comp rockers,push rods,lifters,guide plates,retainers,seals,springs

RPM air gap intake

Edelbrock 750 #1411

My opinion? 11.5:1 c.r. will need more cam.

Good flat torque curve, around 450 from 2000-5000
HP 172@ 2000 peaks 432@ 5500, this was assuming hly lifters, large tube headers through free flow mufflers, per desk top dyno.

As tech said, needs more cam.

Personally those numbers fall a little short I think......?

If the input is correct, the desktop dyno is usually + or - about 5% of what the done engine on the dyno actually turns out. Real world numbers are usually a lot lower than "advertised" numbers. As I said on another post, seen a lot of "600 horse motors" that couldn't get a chassis dyno to register more than 300 !!!!!

why not put a 454 crank in it?? you will have more cubes this is 468 and get it to 12to1 and run a roller cam 680 680 lift 269/279 at 0.50 on 108 do some bowl work on the heads plug that in your deck top dyo who the hell cares about HP what keeps you nailed in the seat isTORQUE

Originally posted by Dave Severson
If the input is correct, the desktop dyno is usually + or - about 5% of what the done engine on the dyno actually turns out. Real world numbers are usually a lot lower than "advertised" numbers. As I said on another post, seen a lot of "600 horse motors" that couldn't get a chassis dyno to register more than 300 !!!!!

Your right on track there Dave, and I've checked DTD against some magazine builds with there specks, all were within 3-4%

Hey dr_bowtie, got that spark plug out of the mini van yet ?

And Pat, I wondered the same but figured he wanted the shorter stroke.

I would have went with a 454 but I bought the short block already together. I know with 11.5 I will need to run race fuel but with the cam I only have a 2800 stall, so thats why I went alittle smaller. Plus I still want to run my power brakes. What cam would you recommend? I want to stay hydraulic flat tappet.

Originally posted by techinspector1
My opinion? 11.5:1 c.r. will need more cam.

my thoughts exactly!!!

Power brakes?????

Young man, I don't know who's been advising you or what you've been reading, but you're way on the other side of reality. I thought when you first posted, you had a bracket racing motor in mind. If you're planning to run this combination on the street, you may not know it, but you're just about knee deep into a nightmare. You're planning your whole build around 11.5 pistons and it's gonna cost you like you won't believe. You'll have to use a cam that makes power from about 3,500 to 7,000 rpm's, so that will mean a new 3,500-4,000 converter and some stiff gears if you don't have them already. You'll need to set aside some time to change valve springs regularly. You'll need a high-rise single plane intake and minimum 850 carb and with the price of racing gas, I'd say you'd be approaching an operating cost, just for fuel, of about $1.00 per mile.

My best advice to you would be to disassemble the short block and sell the Arias pistons on ebay, then purchase pistons which will give you a c.r. of 9.0 to 9.5:1 so you can run pump gas and use your existing converter.

If you're not familiar with how to figure c.r., read this paper I wrote:
http://streetmachinesoftablerock.com...opic.php?t=124

Viking.....

Hell No....I have found plug won't turn if it is cold (left overnight)

But, If I get the engine hotter than snot it'll turn a little ....atleast..more than cold just not enough to come out....

going for the tourch....just gotta remove the exhaust and O2 sensor to get to it.....Very funny....

427 0.60 over this is not to good of a comb power brakes ??? you were going to run this street strip ??put more cam in or take the piston s out. is this some thing you are driving every day? if so take out the pistons if not put a bigger cam in it and get it up to 12 to 5 race gas is the same for 11to1 or 12to5 and forget the power brakes think i would sell all of it or the mass and make a496 or 468 you can make a pump gas monster with the 781 heads and not spend big $$ on gas

I dont want this as a daily driver or anything, I just want to beable to drive it around if I have to. Like to cruises and other shows. I can always get a vacuum canister for the brakes and a bigger stall and rear gears. So with that what cam would you recommend, Do you think I should stay with a hydraulic or go with a solid cam.

i am not a big fan of flat lifters cams in big blocks i like rollers here are some numers howards cam 620/635 294/302 236/242 112 lobe sep and 612/612 296/302 236 /242 on 112this is a good cams for a hydraulic roller mechanical roller 645/645 285/285 244/244/ no110 665/679 282/290 248/254 on110

how much would it cost to swap to a roller set up.