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post #21 of (permalink) Old 06-10-2019, 03:09 PM
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Join Date: Sep 2001
Location: Anaheim Hills, Ca
Posts: 1,477
Re: 289ci Piston Choice

If you're concerned about 289 piston weight, use a longer rod. You could use a stroker rod such as a 5.4" or 5.315" and a piston with shorter compression height and lighter weight. You may have to use a Chevy piston and bore the rod small end to piston pin. Used to happen all the time when people mixed and matched parts to make a one-off engine before more parts became available, but it's more fun to do something a bit different.

The piston speed in a 289 is low though because of the short stroke so stock weight pistons are not usually an issue up to 7000 with ARP bolt equipped rods. 11:1 compression with the piston .030 in the hole means a loose quench and greater potential for detonation. Did you calculate compression ratio assuming the .030 "in-the-hole"?

Tracy Blackford: Anaheim Hills, Ca
65 Mustang, 331 custom built with 289 H beam rods and 383W piston, 282S cam, self-ported '70 351w heads, T5z, 9" w/3.89s. 430 [email protected]
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