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Old 02-24-2008, 02:23 PM
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Old TRW 327 pistons info!

I have a shortblock 327 with a set of .060 TRW pistons part #L2250A. They were not in speed pro's catalog. They have a .500 dome. I was wondering what the advertised compression ratio was on these using 64cc heads. Guessing 13.1 Any help would be appreciated.

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Old 02-24-2008, 05:44 PM
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Old 02-24-2008, 10:19 PM
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G'day camaro421sbc,

You'd be fairly close with your guesstimation of 13:1 with 64cc heads. You can mill quite a bit of material off these pistons to reduce compression ratio. If you get them cheap this maybe an option. The other problem with such a large lump on top of the piston is flame propogation. A smaller bump is much more preferable.

I bought a set of those TRW L2250's back in the late 70's real cheap because of the high compression. I milled off about .250" thou. and with a .035" gasket under 68-70cc heads I had a nice 10.5-11.0:1 compression ratio. Super grade fuel was still readily available then. The motor was a 327 + .030". I was using a Chevy "Pink" (LT1) grind solid lifter cam and from memory had about 160psi compression pressure with this combo. That motor is still seeing weekend use in a monaro cruising Adelaides streets to this day.

Depending on your cam selection you may be able to get away with a higher compression ratio but for a streeter about 10:1 is max these days.

Hope this helps.......Barry.
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