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Old 03-27-2008, 11:06 PM
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SBC Pistons

Hi,
I need help with building my 350 std bore sbc. I have procomp cast iron 2.02/1.60, 190cc fast burn chambers, 64cc heads, 1.5 aluminum roller rockers, comp cam mutha thumper 5.00/4.86 lift,adv. dur. 299 in/ 319 ex, @.050 in. 2.43/2.57 ex., weiland tunnel ram, 2 500cfm edelbrock carbs. detuned, actual probably around 450cfm., cast crank std. large journal, 5.7 stock rods, 2800 stall, 3.91 crys. 742 gears, 17/8 tube street rod headers, 26in. mufflers, 350 trans, shift kit, the pistons that are in the engine are L2256F, the best I can tell is the deck is approx. 0.15to0.20, I want to run 10.1 or a little higher, what piston can I use and not have the block decked, if any. Or any other suggestions are welcome! I also have a LUNOTI 07102 cam and lifters, 5.07/5.07 lift 108 degree. If that would be a better cam? Thanks for anyone's time to help. This is a 1969 4 bolt main block. My goal is to build a strong motor with all components matching and working together. I AM NEW TO THE GAME AND WOULD SIMPLY LIKE HELP WITH MY CHOICES. I bought this 23 t already bult, the engine was strong on top end but sluggish low end. It had 441 heads with 2.02/1.60 valves, some p&p the beforementioned pistons and it seemed to be to low of compression to handle the carburation. So I am looking for suggestions on what components to build my new engine with. Would like to end up around 400hp. I have the components I have mentioned.
Mississippirodder

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Old 03-27-2008, 11:33 PM
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No comment.
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Old 03-28-2008, 12:27 AM
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Hi,
Check me out again and see if I helped clear up my confusion!
Thanks Mississippirodder
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Old 03-28-2008, 02:32 AM
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It's my bedtime, I'm gettin' cranky. Sorry.
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Old 03-28-2008, 03:47 AM
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The cam is way too large,

the converter is too tight,

those Pro Comp heads would better serve you as paperweights and........

punctuation marks, along with paragraphs, make your posts easier to read.


See how that works?

Now, go two lines up the page in the Comp Cams catalog, trade those heads to some other sucker for a pair of Vortech heads and your converter might work a little better with the extra power after installing these parts.



Larry
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Old 03-28-2008, 06:18 AM
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My suggestion would be to return the pro comp heads, port the 441's and put them back on the motor. They flow 194 cfm stock and with some porting will be more than enough for your build. I would suggest any piston that has two valve reliefs (-4cc or less) and then shave the heads down to 70cc's and run a GM head gasket that is .021. This will give you the required compression.

Those cams are a little too much for your build, but the Lunati is not totally unreasonable, of the two I would use that one.
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Old 03-28-2008, 06:33 AM
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and if you want low end torqu go with a stoker crank and go with a 383
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Old 03-28-2008, 08:21 AM
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I would also say that the whole reason the motor was sluggish down low was because you have way too much carb. even at 450cfm (x2) that is 200 cfm more than what is required. Your air fuel mixture is probably so rich in the low RPM's that it is bogging the motor down.

Yeah dual quads look cool, but they are really hurting your performance. If you put them back on and it still runs crappy on the bottom disconnect the secondary's and see how it runs.


I agree on the 383 suggestion as well, unless you run the motor above 6000 rpm fairly often. Then I would stick with the 3.48 stroke crank to make it last longer.
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Old 03-28-2008, 08:54 AM
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Agreed.....I missed the TWO 500 carbs. thats WAY to much for a mild 350.

I dislike edelbroke anyhow, I find that they run rich on low end and lean on the high end.

why do you think it is that Vic doesn't use them on his drag cars?
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Old 03-28-2008, 10:30 AM
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Quote:
Originally Posted by techinspector1
It's my bedtime, I'm gettin' cranky. Sorry.
Thanks for the response.
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Old 03-28-2008, 10:40 AM
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Thanks for the suggestions Holder350. I will let you know how I come out.
Mississippirodder
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Old 03-28-2008, 10:43 AM
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Hi Double_V23,
I have already sold the 441's, hope the Procomp heads will work out!
Mississippirodder
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Old 03-28-2008, 10:49 AM
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Hi coldknock,
Sorry my punctuation was so bad. I appreciate you guys helping me out. I will try and post better! Why do you not like the heads I have? Will you elaberate on that statement, please.
Mississippirodder
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