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Another rookie build. Advice?
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vegasdays101
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Joined: 09 Dec 2009
Posts: 22
Location: Central Illinois
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PostPosted: Wed Dec 09, 2009 1:38 pm    Post subject: Another rookie build. Advice? Reply with quote

I am building a 400, The only goal is to build a good amount of power and it be fairly streetable. I like the CHP Impersonator II, my plan is to somewhat copy what they have. It seems as if there is too much cam but deep inside I am saying screw it.

4.155
9.5-9.7:1
5.7" stroke
284 .525
1.5 rockers
Dart pro 1 230cc, 64cc chamber

Probably will be in a G-Body min of 4.11 gears and min 3000 stall

I will drive it on the street but will not be a daily driver, most of the time... Maybe...

This will be the first time I have bottom to topped it and would like to keep the parts purchases to once.
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jeep_406
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1972 Chevrolet Nova

PostPosted: Wed Dec 09, 2009 7:24 pm    Post subject: Reply with quote

Welcome to SMOKEmUP.com
Do you plan on taking it to the track or just looking for a quick street car?
Do you have some of the parts or do you need to buy everything?

Don't remember what parts are in the CHP Impersonator II. What issue or issues does it appear in?

I run a 408 that is very streetable with a 700R4 and a 4.11 gear. Gets decent mileage and tools along at 70MPH turning around 2200RPM.

Driving
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vegasdays101
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Location: Central Illinois
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PostPosted: Wed Dec 09, 2009 7:30 pm    Post subject: Reply with quote

I am looking for a quick street car but not a daily with prob a few four 5 trips to the 1/8 and maybe a couple to a 1/4 mile with some buddies. We are pretty close to the 1/8 if it wasn't obvious.

At this point I need to buy everything almost. Block is at the machine shop, but I did maybe hook myself into the pistons already which are 10:1 static.

Another strange thing is I got rid of the only chevy I had but I aim leaning toward a g body
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robins44
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PostPosted: Wed Dec 09, 2009 8:10 pm    Post subject: Reply with quote

maybe its just me but i feel those heads might be a little to big for something like that, if i remember correctly dart reccomends those on 434's and bigger.
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Big Dave
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PostPosted: Wed Dec 09, 2009 10:39 pm    Post subject: Reply with quote

You also have to keep in mind as the volume of the motor increases the cam has to get longer in duration to match the added fluid you are trying to move through it. So what would be a wild radical cam in a 305 is going to be factory tame in a larger 406 motor with no change in the specified numbers.

CHP has built three 406 and each one was very streetable but made very good numbers as they were building each motor for a street driven staff owned car (they tested the same engine in three different bodies to give you an idea how a lighter car will fly with 500 horse and a Biscayne (where it ultimately ended up ) will be merely happy with it.

Big Dave
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af2
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1933 Willys Coupe

PostPosted: Wed Dec 09, 2009 11:03 pm    Post subject: Reply with quote

The 500 hp has me wondering????
Everyone has it????
An honest 450 will scare the shit out of most people here!
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vegasdays101
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PostPosted: Thu Dec 10, 2009 2:17 am    Post subject: Reply with quote

af2 wrote:
The 500 hp has me wondering????
Everyone has it????
An honest 450 will scare the shit out of most people here!


Everyone should!
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af2
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1933 Willys Coupe

PostPosted: Thu Dec 10, 2009 11:39 pm    Post subject: Re: Another rookie build. Advice? Reply with quote

A couple things you should know.

vegasdays101 wrote:
I am building a 400, The only goal is to build a good amount of power and it be fairly streetable. I like the CHP Impersonator II, my plan is to somewhat copy what they have. It seems as if there is too much cam but deep inside I am saying screw it.

4.155
9.5-9.7:1
5.7" stroke Rod length
284 .525 At what opening? .050 and who's cam
1.5 rockers 1.6 Intake will help
Dart pro 1 230cc, 64cc chamber Untouched?

Probably will be in a G-Body min of 4.11 gears and min 3000 stall

I will drive it on the street but will not be a daily driver, most of the time... Maybe...

This will be the first time I have bottom to topped it and would like to keep the parts purchases to once.

The last part of the question is why I typed. You might have to change a few things to get where you want. Once you see it, it has to faster. That is good! Very Happy
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af2
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1933 Willys Coupe

PostPosted: Thu Dec 10, 2009 11:41 pm    Post subject: Reply with quote

I added to the quote and it didn't get bold. Please go over it for the Q's asked.
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osmiumfoot
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PostPosted: Fri Dec 11, 2009 5:56 am    Post subject: Reply with quote

I have read a lot about "streetable" and "unstreetable" combos, and having putted around in a SB 400 in a variety of configurations over the past few years, have concluded that most combinations are"streetable" if you stall the combo up, run a couple of tranny coolers, put some gear in it, and if you can put up with the Honda at the light that thinks because your cam is trying to shake the hood off your car, that you want to race him. A lot of stall takes most of the laziness out of big heads and cam on the bottom end, and is actually fun to drive on the street if a 900 rpm idle doesn't bug you.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri Dec 11, 2009 11:35 am    Post subject: Reply with quote

I have to agree with osmuimfoot. 400's of any flavor as long as they are stalled correctly they are very streetable.
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Knarley Darley
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PostPosted: Fri Dec 11, 2009 1:10 pm    Post subject: Reply with quote

Had a 406 in a 67 Camaro back in the day with ported camel hump heads, a Comp 280 cam and the bolt ons, headers, intake ect. It was a 4 speed car that went mid 13s at 105 or some thing like that. The E.T. would have been much quicker if it had traction. You pretty much had to leave at idle and roll it on in first and second, or it would blow the tires off. I eventually added a 150 shot to it and at 65 mph in 4th gear it would drive right through the center force clutch that was in it because of the rediculous torque it had.
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Fri Dec 11, 2009 1:36 pm    Post subject: Reply with quote

Knarley,
I bet if it had an automatic with a converter it would have been sideways in high gear upon spraying it.... Twisted Evil

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Big Dave
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PostPosted: Fri Dec 11, 2009 10:42 pm    Post subject: Reply with quote

Well for openers you are building a 618.2 cid motor which is tuff to do with a small block motor. If you are building a 618 you don't have enough cam. So I assume you are talking rod length at 5.700" and not the stroke which in a 406 is 3.75".

As to the question of rod length that drew me to the post, I would say that this has been argued over and again without resolution. I will say I favor a longer rod, especially when not street driven, based upon the fact that the single most important benefit of a longer rod is a lighter piston. I prefer the lightest strongest rotating assembly I can afford. Good for street or strip, but street doesn't need forged internals the way a raced vehicle does.

Big Dave
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vegasdays101
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PostPosted: Fri Dec 11, 2009 11:50 pm    Post subject: Reply with quote

Big oops on the stroke, I did mean 5.7 rods. I kept doing that on the DCR calculator the other night too switching the rod and stroke around.

As long as the combo is in the ball park I will try and narrow it down, if I need smaller heads or cam adjustment. If I can get away with the bigger heads I will in case I want to do more later.
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