Phlebmaster
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Posts posted by Phlebmaster
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Actually those heads are so bad that I won't comment as to why you using them. Flow wise and cheap lightweight castings all spell disaster for any motor combination built using them. My humble opinion and that of the entire WWW.
lol...ok, but notice that I didn't ask about that.
I know I need to get Vortecs and I will in time, but this is my first round with the sbc and I am just getting to know her. So now that that the lashing is out of the way, can I get help with the comp?Forget about the head casting #...the 58cc head is the important thing here.
I have heard many positive things about the 081 heads, they are the non-swirl port TBI heads.
081 iron head (305 cylinder #14014416 airflow #'s): 195 intake; 110 exh (ME Leigh)Flow chart for stock #14101081 305 head 87 91
Intake lift (in) Flow (cfm) Exhaust lift (in) Flow (cfm) Ratio E/I flow (%)
0.050 31 0.050 15 49
0.100 63 0.100 37 58
0.150 92 0.150 61 67
0.200 116 0.200 78 68
0.250 134 0.250 92 69
0.300 157 0.300 101 64
0.350 170 0.350 105 62
0.400 182 0.400 107 59
0.450 189 0.450 109 58
0.500 195 0.500 110 56
They have a decent flow with a little port work and the heads I was using were the crack prone 624 heads with 1.72 intakes so this is an improvement.....that is my simple explanation. I used them because I had them.
I found this thread with close to the information I need to run the calculator, but it is for a 400 not a 350.
http://forums.hybridz.org/showthread.php?t=66574
Bore - 4.155 inches
Stroke - 3.75 inches
Cyl head volume - 64 cc
Deck height - 0.010 inches
Head gasket bore - 4.2 inches
Head gasket thickness - .039 inches
Piston dish volume - 12.5 cc
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I just rebuilt the top end of my 350 sbc and need a little help by those who are more familiar than I am with using those fancy compression calculators. I know a few of the measurements, but not all of them to complete the calculations on my own.
Thanks in advance for your help.
Here is what I have:
Standard sbc 350
Block: 3970010 date code of something 74' (can't remember) but it is not the stock engine for my 1972 C20 3/4 ton.
Heads: 14101081 305 58cc 1.84 intake / 1.50 exhaust
Pistons: The standard stock dished with double valve reliefs.
Bores: Standard size
Block has not been milled or decked.
Head gaskets: Standard thickness Felpro
I can't think of what else you would need to know.
Here are some pictures for reference.....
Completed engine
I don't know why this head says 55.4..but it does. I don't know if that is the milled CCs or just some jibberish.
You can see that the pistons are just the standard dished ones.
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But seriously, we like people who spell things out here when they speak accurately. (Or was that precisely? hmmmm....)
Precision vs Accuracy
Learned this in lab class.
In the fields of engineering, industry and statistics, the accuracy of a measurement system is the degree of closeness of measurements of a quantity to its actual (true) value.
The precision of a measurement system, also called reproducibility or repeatability, is the degree to which repeated measurements under unchanged conditions show the same results. Although the two words can be synonymous in colloquial use, they are deliberately contrasted in the context of scientific method.
Point: You can be precisely inaccurate, but never accurately imprecise.
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Interesting....
Most people who are posting about your given example (five speed) usualy will type 5 speed instead.
Example search: http://forums.hybridz.org/search.php?searchid=4285320
I typed in "5 speed" and came up with a ton of threads. It is a challenge to pick out only the threads you want sometimes admittedly, but for most questions, they can be answered this way. It does bring up threads with "speed" but then you can narrow your search by searching in a specific forum. My search did leave out the "5" due to it being too short of a search term. Thats when you should choose another term for your search criteria....maybe less specific.
It is a matter of spelling. You can also narrow your search by searching in one particular forum or thread rather than the entire site.
I hope this helps.
Maybe I am missing something (haven't searched enough?) but I can not find out how to search phrases on the main search page. Oddly, the FAQ page has a search phrase option - Search FAQ Search Word(s):Matching Options:
Match Any Words Match All Words Match Complete Phrase Search in:
Search Titles Only Search Titles & Text
but the main Forums search page does not seem to have one. It does single words only. So a search for "five speed" brings up all the posts with five and speed, not just "five speed".
Actually, just "speed" - from my example search - (=0&childforums=1&titleonly=0&showposts=0&searchdate=0&beforeafter=after&sortby=lastpost&sortorder=descending&replyless=0&replylimit=0&searchthreadid=0&saveprefs=1&quicksearch=0&searchtype=0&nocache=0&ajax=0&userid=0&"]Search: Keyword(s): speed The following words are either very common, too long, or too short and were not included in your search: five).
I think this is one reason people don't find what they search for. Too many results to sift through.
Am I missing something? This is a great site and I'm sure it takes a lot of work to maintain. Not too be critical, I'm just trying to help out.
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I'm looking for both sides. Please send me a quote with shipping to 99703, it's Alaska I know it's gonna cost an arm and a leg. I don't feel that my fenders are in good enough shape to repair.
BRAAP has a nice set of FG fenders. Don't know if he would be willing to ship them...but you never know and they are rust free guaranteed! lol http://forums.hybridz.org/showthread.php?t=156355
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Here is the video.
enjoy!
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I got her running tonight!! YAY!
I will have a video tomorrow including before and after shots. -
Very nice work!
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I got me a new Edelbrock 1404 500 CFM carb tonight that is actually NEW!! Thanks to Blackice280z and kamakazi620.
I also have a good Q-jet coming tomorrow....so I will have two q-jets (one good & one worn out) and one new 1404 carb at my disposal. I am very happy about that. Funny thing...it says Weber on it! lol
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I've been on several internships which basically let me work in an engineering position without a degree. OSU has a special program where take 6 months out of each school year to work basically as an underpaid, temporary engineer. Really helps getting jobs later on I think.
I've thought about staying to get my Masters but ultimately decided to take my chances. I am hopefully going to get an offer from one of the places I worked for previously, but was hoping to have more than one choice for work..
Network, network, network!
Get in as many places as you can and blow them away with your enthusiasm. In healthcare that is how you get a good job. It seems like everyone knows everyone else in healthcare so getting to know people in your field of interest is a gold mine.
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I made more progress tonight....
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As of 7am this morning the upload option for photos was dissabled, pending some server/forum software upgrades.
Hang tight...
In the meantime you can still use an image host and post up pics that way for the time being.
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PM sent.
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Progress tonight!
I put on the new heads and got them bolted down. I followed the correct torque sequence and procedure for getting them done right.
Feels good to make some progress! Now I just need the friggin carb that works. lol
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I started to tear apart my motor tonight so I can put my new heads on and make sure my cylinder walls are ok.
I have dished pistons so I can get away with the small chamber heads I am going to use.
A little paint for show....
The 624 heads that were on my truck are the 1.72 valve!!
I am glad to not have to use them any more. Now I have a set of 1.84 1.50 valve 58cc heads. You can compare the old head on top with the 58cc head below. -
i have a 625/650 that is freshly rebuilt, run they removed. i value it at 100 bux. its got the ford linkage on it as well.
Thanks Shady, I will let you know if my stuff sells. In the meantime I am looking to trade locally so shipping won't be a problem.
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http://portland.craigslist.org/clc/pts/1500765393.html
My Holley 750 won't stop flooding (which I found out they are famous for) and I have tried all of the remedies. New seats floats etc... I did my research and worked with it for two days...and after two engine fires I am done with it. I just want to switch to Edelbrock carburetor. I have a ton of Datsun stuff for trade and even some SBC stuff that you could sell for way more than the carb, if you help me out.
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Thanks inferno, she'll be off to Irvine cali next week for a nice road trip.
WoW! Looks very nice...I am so happy to see her getting the treatment she deserves.
Have a safe trip
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Well, after much research and discussion with those who know about what I plan on doing with my engine I have decided to do this one step at a time rather than all at once.
Tonight I put my new intake and Holley 750 on.
I will install my cam once I get heavier springs. I can tell you this about the stock crap that was on my truck...the intake had a bunch of loose bolts and all of the fittings were not tight either. It is a wonder it even ran! I fixed that though. I will not be able to test this new stuff out untill I get a new water fitting that runs from the intake to the heater core.
Here are the obligatory pics of the swap!
So it begins,,,,
Now that feels better already! Damn that thing is heavy!!
All finished for tonight...I can't wait to start her up tomorrow!
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This is what is going on the 350.
This is a Comp Cams 270H with a 112 LSA and 4/7 swap. I can't wait to get this in.
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Here is how the engine looks now....kinda ugly. I will take pictures of the "after" I make my changes so you have a comparison.
Before...
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dear lordy!!! is that size exhaust necessary on an l26?!?!
Yes!
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Chey loves that movie too....
Especially when Paul pulls his super dance moves while puting a sbc together.
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It happened to me a couple of times too. I just threatened my computer with a huge magnet and she stepped right in line.
This error is intermittent so it is hard to determine what is causing it on the user end.
I know I need to get Vortecs and I will in time, but this is my first round with the sbc and I am just getting to know her. So now that that the lashing is out of the way, can I get help with the comp?
I will have a video tomorrow including before and after shots.
I am glad to not have to use them any more. Now I have a set of 1.84 1.50 valve 58cc heads. 
Compression Ratio Help Please
in Gen I & II Chevy V8 Tech Board
Posted · Edited by Phlebmaster
Thank you for your help.
I found a calculator that gives me a ball park figure of 10.81:1
http://www.aacncclub.com/crucemotor/compressionratio.html
I am pretty sure based on what I have read about my set-up, that this is pretty close to accurate. Maybe not exact, but close at any rate. I was not able to account for 12.5 cc dished pistons on this calculator.
I just was needing to know this because I will have to figure out what my octane should be. Looks like premium at minimun...92 octane.
Thanks!