[Guest]

I have a 289 that was bored .20 over. How many CI do I have now?

Thanks for the math lesson!

Rex
1966 GT 350 Clone
289 (rebuilt with JE, Eagle, Arp)
Edleborck RPM Heads
Comp Cams hyd roller, Crane 1.6 rockers,
Holley 650 DP, Hookers 1 5/8, T-10, 3:55 Gears, Custom Dual exhaust with X Pipe

 

[1966conv]

3.1415*(2.0182.01)*2.8748*8

1966 Red Conv (200)
1966 White Pony Int.(289)A Code
1966 Coupe (289) C Code
MCA 36048

 

[autoxsteve]

Displacement = Pi * Dia * stroke * (# of cylinders)

Stock: disp = 3.1415 * 2.88 * 4.0 * 8 = 289.5 cubic inches
.020 over = 3.1415 * 2.90 * 4 * 8 = 292 Cubic Inches

My situation:
302 stock: 3.1415 * 3 * 4 * 8 = 301.6 cubic inches
302 .030 over: 3.1415 * 3.03 * 4 * 8 = 304.6 cubic inches



Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat

 

[Guest]

Add 0.030 to the bore, not the stroke. Then divide it by 2, then square it.

 

[Teebone]

and face it size counts...*LOL*

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