Thread: 400ci sbc

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Techinspector1, Thank You! It took a lot of effort on Your part just to work those compression ratios out for us. We appreciate it very much . I dont want you to go to that much trouble again right now but consider this, If i wanted to increase the compression up to close to 10 to 1.( i've always heard that alluminum is good for about one more whole point of compression) I should still be good on pump gas,But I dont think a thinner head gasket will achieve that. Off the top of your head, how many tenths of a point of compression to you think I can achieve.Im not crazy about cutting a new set of heads ,but I might.thanks again, I have always enjoyed reading your post.You are quite helpful to a lot of people.

Type in compression ratio and do a search and you will find some good ratio caculators some give you a more precise ratio than others due to more info you have to input. This is a pretty good site below if the link works, I have found many others that are pretty good also. Some sites have a really good explaination of compression ratios and even go as far as Dynamic Compression ratios, though the link below disputes calling dynamic compression dynamic.

http://not2fast.wryday.com/turbo/com...pression.shtml

Techinspector1, why shouldn't one use head gasket thickness to adjust CR. What if your block had already been decked to much, installing a thicker head gasket will bring that figure back to where it should be. No? Just wondering about that piece of advice.

I called them months ago and I thought that is what they said but me being a senior citizen now my mind may be the first thing leaving me.I'll call them again ,today. I hope You are correct.That should come close to giving me what I'm looking for.I have a new 850 Holley double pumper that I bought for my vega and never used and a new Victor Jr.I wont use either one but I may offer to sell them as a package.A friend has a 280--480 hydraulic roller that he used for a short while before going to a bigger stick. I may take a look at that. I will proberly go to a 650 to 700 Holley double pumper with a performer rpm air gap. A 3--2s setup or a 2-4 set up has some nostalgic appeal to me but rest assured you wont have to talk me out of a tunnel ram.On the street ,it wouldn't make a good boat anchor. Just thought of someting, Maybe at 60 Im Dyslexic and turned that 67 cc's around to 76cc's What do you think?

Thanks Techinspector1 and all you other guys that replyed to all my questions. Thankyou all.

DeRo and Techinspector1, DeRo , I dont mean to steel Your thread but I think we are all learning something here . I preach to people all the time to use parts that work well together and here I am trying to find a way to use a set of high dollar heads just because I have them.I found the info on my heads this morning 215cc intake 67cc chamber 208 intake valves 160 exhaust. No way to have any bottom end in this heavy lead slead.I would have to use too much cam ,intake ,carb and gear and my main objective would be out the window. I want something that runs good but i can drive anywhere on pump gas. Still not wanting to conceide I called comp cams hoping for a cam that would restore some bottom end. No HELP! I knew that . Why did I waste the call?Then I come home turn on the computer and read Tech 1's comments. OK! Im ready to go in a new Direction.I have a couple sets of double hump heads but not sure I want to do that either. You know they were very good back in their day, BUT , their day was a long time ago.I may have to re-think the motor situation all together . Thanks for your help, Thanks for your advice, thanks for listening.

Riverhorse59, Huff that baby, she'll breath easy down low. Lots and lots of POWER! Those are some pretty nice heads.

TechInspector1, I called Brodix today and asked for their lead Tech man. I wanted to run what I had buy him and see if there was any posibility of trading out the track 1s for something more suitable for the street .He gave me the name of a speed shop ,I think its out near you,Robs Speed Shop. He assures me Rob will trade me for the brodix race rite 180s or200s He also told me to call comp cams because they could build me a cam to fool the heads .I told him I had done that ,NO help. He said I just hadn't talked to the right man.He told me to talk to one particular cam grinder and he knew this guy could fix me up. This guy said he could accompolish what I wanted.He recommended I keep the victor Jr. intake ,Use a 650 to 750 carb,my 411gear with the 6 speed. He wants me to cut at least ,024 off the heads and use a thinner G.M. performance head gasket.He says we are looking for between 10.5 to 11.0 to 1 compression. With the cam he wanted to keep the air speed up and keep a tighter seperation. He's thinking 224-230 109 straight up 477-482 lift .With 1.6 rockers lift would be 503-510. The roller cam would be the same except for lift 536-554. he assures me it will have plenty on the bottom end.and says I sould be able to drive it anywhere on pump gas.Not sure this is the way Im going. Something to think about.