I just purchased a 71 that came with a 302/ 4 barrel/ c4. Currently has a Cleveland/C6. The block has a broken crankshaft where they all break but it did not damage the block. The block has a D1 number but the intake has a C8 number. It had a valve job at some time and I hope that the heads are the originals. How can I tell if the heads are the originals?
1 tooth usually is equal to 3mph