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Another rookie build. Advice?
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robins44
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PostPosted: Sat Dec 12, 2009 4:10 pm    Post subject: Reply with quote

for a 406 i just think those heads are going to be too much, you want to keep the velocity up. My buddy has a set of 230's on his 383 and it runs good dont get me wrong, but i would love to see what it would do with some 195's or 210's on it. Correct me if im wrong guys, i also looked at the stroke and assumed he meant rod length lol, i figured someone would chime in.
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lun40119
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1967 Chevrolet Chevelle

PostPosted: Sat Dec 12, 2009 4:45 pm    Post subject: Reply with quote

With that cam, those heads might be a little large. Part of the problem with your buddies 383 is it is using a 4 inch bore with a 2.08 valve, which is probably a little large for it. A big bore sbc, will use the bigger valves much better. OP, unless you are going to turn it harder, run a 215 head. Take care good luck, and ask lots of questions, it is better to ask the question than not ask and have it blow up in your face.
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vegasdays101
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PostPosted: Sun Dec 13, 2009 12:04 am    Post subject: Reply with quote

Ok. So smaller heads probably. Also, after more reading and more playing with calculators I find that determining what will work on pump gas is a PITA.

I was trying for now to keep it flat hydraulic cam but it appears the intake closes a bit early to keep the DCR in the <8.5 range.

How Necessary is all this? I am assuming pretty serious but reading posts that only post static ratios and duration it seems I could get away with 10:1 ish and the cam I was wanting 241/249 .525/.546. 110 centerline 46.5 ABDC

Some calculators put me around 8.7 and the ones with more questions put it in a range like 9.7.

Stock deck 9.025
i figure .045 for the piston deck clearance
i was using .041 compressed gasket for calculatings sake
64cc combustion chambers ( suppose I could get larger )

Is this going to detonate ya think?
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lun40119
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1967 Chevrolet Chevelle

PostPosted: Sun Dec 13, 2009 3:32 am    Post subject: Reply with quote

You will find most advertised combustion chambers to be larger than what they say, that being said don't live and die by what calculators say. There is nothing more annoying than a newb that tries to contradict stuff with what "the calculators say". Good luck fella......
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af2
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PostPosted: Sun Dec 13, 2009 5:24 am    Post subject: Reply with quote

That 46.5 is probably at .050 and not the # you need when doing the calculation. You need close at ".000"
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vegasdays101
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PostPosted: Sun Dec 13, 2009 12:20 pm    Post subject: Reply with quote

lun40119 wrote:
You will find most advertised combustion chambers to be larger than what they say, that being said don't live and die by what calculators say. There is nothing more annoying than a newb that tries to contradict stuff with what "the calculators say". Good luck fella......


Thats funny, I have noticed what you are saying in different threads. The back and forth with the calculator said bit. I was just starting to get a bit confused with all the different sources of info.

af, I will try and find the 0 closing

Thanks guys
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lun40119
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1967 Chevrolet Chevelle

PostPosted: Sun Dec 13, 2009 3:53 pm    Post subject: Reply with quote

I am glad I am amusing you, fact of the matter is I dont give a shit what the calulators say. Good luck with your build. I am sure you will be in the 550-600 hp range no problem.
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vegasdays101
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PostPosted: Sun Dec 13, 2009 5:15 pm    Post subject: Reply with quote

Thats not what I meant... I meant it like it's funny because I have seen what you are talking about with people saying the calculator said...

I appreciate your advice.
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lun40119
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1967 Chevrolet Chevelle

PostPosted: Sun Dec 13, 2009 6:00 pm    Post subject: Reply with quote

I gotcha now. Thing is after you do this for a while you will get a feel for what will work, and what wont. Like Adam for instance. He has been around since the invention of the internal combustion engine, and probably had a hand in inventing it. He just knows what will work and what wont.
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vegasdays101
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PostPosted: Tue Jan 05, 2010 2:27 pm    Post subject: Reply with quote

Oh The decisions...

So I bought a bigger cam. Solid 260ish .600 lift. 55 ABDC

Going to use a little more compression

I have a buddy who wants to sell me a 700DP, is that going to be enough carb? I was planning on an 800 or so but he swears a 700 will be plenty.
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osmiumfoot
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PostPosted: Fri Jan 08, 2010 4:12 am    Post subject: Reply with quote

"The calculators say" that 700 cfm might be adequate, but what I found is that going from a 750 to a Quick Fuel 850 made the 400 happier, which in turn made me happier. Spread the joy, my boy.
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vegasdays101
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PostPosted: Wed Mar 10, 2010 1:42 am    Post subject: Reply with quote

Hey guys. I am back again... So all the advice has gone good for me. I have gotten some main bearing advice that I think doesn't apply to my situation. I have assembled the bottom end but...

So I have my main bearings at .0015 except cap 5 which is .002

It was recommended since it would see more street to set them tight but I am getting nervous after reading on the web. Man, the web has been my best friend yet makes me second and triple guess everything.

What clearances do you recommend? 2-3?
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10sec.et
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PostPosted: Wed Mar 10, 2010 2:00 am    Post subject: Reply with quote

thats a little tight for my taste, even on a Chevy. if memory serves, the rule of thumb is .001 per inch journal diamiter. ex. 2" rod journals= .002 clearance. we like em looser than that on the Olds engines.
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It seems we can look at our magical Balls and come up with a fix?

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squeeezer
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PostPosted: Wed Mar 10, 2010 3:17 am    Post subject: Reply with quote

vegasdays101 wrote:
Hey guys. I am back again... So all the advice has gone good for me. I have gotten some main bearing advice that I think doesn't apply to my situation. I have assembled the bottom end but...

So I have my main bearings at .0015 except cap 5 which is .002

It was recommended since it would see more street to set them tight but I am getting nervous after reading on the web. Man, the web has been my best friend yet makes me second and triple guess everything.

What clearances do you recommend? 2-3?









good#'s
run thin oil like 5w30
standard pump (pressure)
i dont know of a good reason to loosen the motor
but again my motors only run between 6 and 7 k......in other words no race only engines

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af2
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PostPosted: Wed Mar 10, 2010 2:09 pm    Post subject: Reply with quote

You need .0025" minimum with the 2.65" journal.

It only took 1 time for me to find that out. Laughing
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