I appreciate your oppinion and understand your point. If you ever have seen any of my other projects you would know that I typically take my engine apart and put it back together several times during the time I own them. My 15 yo daughter get's to learn how to tear down an sbc that way. The learning experience is worth more to me than a few dollars and little bit of time spent.besides this is a daddy and daughter project. ![]() The gaskets are cheap and it takes about 6 hours to do the job. ![]() I have no problem pulling my motor apart when I get new heads. Typically, the price of gaskets, time involved, etc, etc, it's better to wait and get better heads and do it right the first time, rather than take it apart to do it all over again IMO. Click this link, scroll down, click on the Compression Calculator link. When you tell a piston company that youre running a 400 small block Chevy with 30 lb of boost and 96 Nitro and you. I'm not sure where you got the flow numbers but that is on the good side and they max out at. Use Summits compression ratio calculator. Each piston is engineered with race ready features like high upper compression-ring locations, gas-accumulator grooves, drilled oil returns, and spiral-lock retainer grooves. Honestly if you look at the outboard side of the head where the head bolt holes are and you see the scalloped outline, that is indicative of the lightweight castings, all of which are not very desireable. I just was needing to know this because I will have to figure out what my octane should be. The formula for determining deck clearance volume is similar to displacement: DC Bore x Bore x 0.7854 x Distance between Piston and Deck at TDC If the piston in our example at TDC is 0.020 down. I was not able to account for 12.5 cc dished pistons on this calculator. I am pretty sure based on what I have read about my set-up, that this is pretty close to accurate. 020 steel shim head gasket.Ĭylinder Head Volume Number in Cubic Centimeters 58ĭisplacement: in Cubic Liters 5.7329230464ĬUBIC INCH CALCULATOR and COMPRESSION RATIO Check the changes in compression ratio if you enter these numbers, or use a. Chevrolet also made 64, 68 & 72 cc heads. 040 head gasket thickness - 76 cc head volume should give you a CID of 349.781 (350 Chevrolet) with a compression ratio of 8.5 to 1. This technique is suited to someone who is in the middle of putting an engine together and has the right tools, or someone whose engine is already in pieces.Sample: 4.000 bore - 3.480 stroke. One way to help with this clearance to use a new rod bolt from ARP (PN 134. We're looking at the first of these ways here. Using stock 5.7-inch rods in a 383 requires grinding the leading edge of the rod near the bolt on rods 1, 2, 5, and 6. Firstly, you can make a math calculation as accurately as possible, or secondly - the more popular method - uses an empty spark plug socket with a pressure gauge inserted. There are two ways of calculating the compression ratio for an engine. The compression ratio is the ratio between two elements: the gas volume in the cylinder with the piston at its highest point (top dead center of the stroke, TDC), and the gas volume with the piston at its lowest point (bottom dead center of the stroke, BDC). The compression ratio of an engine is a very important element in engine performance. I have 75cc combustion chambers, (they have been milled just enough for a true mating surface. I am looking for a combination for around 10.5-11:1 compression for my 355. How to use this calculator: Simply fill in all the boxes below with the requested figures and click on "Calculate CR" to find your engine's compression ratio. When looking in the magazines and on the net you get a lot of variances on the listed compression ratios. ![]() This compression ratio calculator can be used to work out the compression ratio of your engine.
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