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Old 02-15-2005, 07:18 PM
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Pro1 head question???

How big of a sbc short block can i build be for i need bigger heads?
to get max out of a 383/406/421/434 small block.
I have cnc dart pro1's my cam will be something like this...

Roller with a .680 lift and 270/280ish @.050 and 112sep.

I wood like to spray it with a 250/375 shot.

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Old 02-15-2005, 07:45 PM
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wait, you spent 1400 dollars on heads and you don't know what you're building with them? Add it to the pile guys.

K
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Old 02-15-2005, 07:57 PM
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Re: Pro1 head question???

Quote:
Originally posted by chevelle434
How big of a sbc short block can i build be for i need bigger heads?
to get max out of a 383/406/421/434 small block.
I have cnc dart pro1's my cam will be something like this...

Roller with a .680 lift and 270/280ish @.050 and 112sep.

I wood like to spray it with a 250/375 shot.
I hope you don't plan on driving it on the street. That cam is way too big.
You are going to be changing valvesprings every couple months. You will wear that cam out quick if something else doesn't break first.

You will need a 4,000+ RPM stall converter.
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Old 02-15-2005, 08:24 PM
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It will have a 5speed behind it.

heads are on old engine.

i want to build a bigger small block i just want to know how big i can build be for the heads are to small???


What cam Wood you run???
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Old 02-15-2005, 08:29 PM
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It depends on what you are going to build. You have to factor in what heads, your compression, gearing, induction, intended (real life) RPMs, and a million other things.

The cam you listed will rule out anything except for high dollar racing.
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Old 02-15-2005, 08:51 PM
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It will be 11 to 1 compression.

3.73s on the gears.

rpm's should be 3,800 to 6,500/6,800

cruising rpm's right now are 2,600@70mph

this car wood be a street racer/ driver.
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Old 02-15-2005, 09:11 PM
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I have 2.73s in my Camaro. At 70 mph my RPMs are at 2,800.


I would go with a cam around 240o to 250o @.050" with as much lift as you can get. Depending on the cam type it will be in the .550" to .600" range. Lobe sep. would be good from 110o to 112o.
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Old 02-15-2005, 09:34 PM
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My 5speed is not richmond. 5th is OD in mine not 1:1 like a richmond.

i wood really like to know how many cube's my heads will take?

BTW... sorry for my spilling I never really learned that.
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Old 02-15-2005, 09:38 PM
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As many as you can get out fo the stock block. It all comes back to application.
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Old 02-15-2005, 09:41 PM
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Not trying to flame you or anything, but at the bottom right of the reply box is a spell checker key, some posts on here are Ni on unreadable due to spelling, and grammer errors, but I think English is not some poster's native language.
BTW what do the Pro ones flow? and whats the runner cc, chamber cc, and Max lift?
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Old 02-15-2005, 10:19 PM
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Quote:
Originally posted by rick458
Not trying to flame you or anything, but at the bottom right of the reply box is a spell checker key, some posts on here are Ni on unreadable due to spelling, and grammer errors, but I think English is not some poster's native language.
BTW what do the Pro ones flow? and whats the runner cc, chamber cc, and Max lift?

heads are intake 215cc's 280cfm @ .600 lift and .700 max lift.
chambers are 68cc's

what do you think?

Quote:
Originally posted by lluciano77
As many as you can get out fo the stock block. It all comes back to application.

I sead it will be a street racer/ driver.

434 is max on a stock 400 block.
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Old 02-15-2005, 11:05 PM
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I run those same heads. They should feed 430+ ci fairly easily. This really all depends on the use and RPM band of the engine. The larger you build the engine the more low end torque these heads will provide but you will lose top end. That goes for any head of a specific size.

Building a 430+ cu out of a factory block is asking for trouble. It is fine for low performance applications but, not for high RPM/performance use.

You have to put a combo together that all parts work together. Once you figure out the use of the car and your goals then you can plan out a combo to get there.

For street driving, the cam you chose is way too much (IMO).

What intake? Carb? Exhaust? How mush does the car weigh? How fast/quick do you want to go? With that much nitrous you don't need that much cam (duration).

Royce
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Old 02-16-2005, 06:11 AM
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A World MOTOWN block can get to 427
fairly easily, and 454 with work
same with a Dart Little M
World also sells a 427 rotating assy
4.125 x 4.00.

with those heads and a smaller cam
you should get high 400s in HP and FT/lb

back the Cam down to 245-250 duration range and .510-.520 lift
Hydraulic rollers start to become unstable around 5500, so if you are going that high
use Mech rollers, and you might as well use roller rockers to keep the valve train friction as low as possible and not rob power

Use a Torker II or a Victor jr intake
and an 825 or 850 Mighty Demon

1 3/4 inch headers, and short gears you should be cooking with gas and destitute
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Old 02-16-2005, 07:25 PM
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Quote:
Originally posted by rick458
A World MOTOWN block can get to 427
fairly easily, and 454 with work
same with a Dart Little M
World also sells a 427 rotating assy
4.125 x 4.00.

with those heads and a smaller cam
you should get high 400s in HP and FT/lb

back the Cam down to 245-250 duration range and .510-.520 lift
Hydraulic rollers start to become unstable around 5500, so if you are going that high
use Mech rollers, and you might as well use roller rockers to keep the valve train friction as low as possible and not rob power

Use a Torker II or a Victor jr intake
and an 825 or 850 Mighty Demon

1 3/4 inch headers, and short gears you should be cooking with gas and destitute


I have 1 3/4 by 28" inch headers,

I will run my bowtie intake. (it's like a Victor jr but bigger)

There will be a pro shifted 5speed behind it.

I'm was looking at stock block#817 that is race prep already.

I wood run 3.875 stroke and 4.145 bore with a lower .600 lift cam.
thats 421inchr.

what do think???

Thanks Ryan
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Old 02-16-2005, 08:28 PM
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That cam needs 12-14:1 CR and will pull a small block to 7500-8000RPM. I am not sure what you are thinking with this. It is a cam that you might use when trying to make an 800 HP small block. No one in their right mind would try to use a 5 speed with that. Lenco or PG with 5500RPM converter is the only way that thing would pull off the line.

Go down to a reasonable cam and drive the thing.

Chris
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