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Forum: Hot Heads Tech Talk

Forums->Hot Heads Tech Talk->Re: 270 hemi pistons

30redram
Re: 270 hemi pistons


> I have a 270 Dodge hemi and a set of .030 NOS 315 hemi car pistons that I picked up years ago at a swap meet. So when I get the 270 bored, if I use the 315 pistons, will it raise original 270 compression ratio from 7.6 to 1 to the 315 ratio of 8.25 to 1? The one book lists the pistons as 8.5 to 1. My Tex Smith hemi book says 8.25 to 1. Any ideas?

After checking with my 1959 MOTORS manual, it appears the 270 and 315 have different wrist pin diameters. The 270 is .8592 and the 315 is .9216. Unless the small end of the rods can be re-sized to the 315 wrist pin diameter, it does not appear the 315 pistons can be used with stock 270 rods.
  user offline
on: Wed 26 of May, 2021 [04:00 UTC] reads: 102

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