In the hole
01-06-2007, 06:58 PM
#1
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Engine: 350 TPI
Transmission: 700r
Axle/Gears: ford 3.55
In the hole
This was a new 88 caprice crate engine 4 bolt main from GM.Installed the Eld. rpm package.Drove for 20k miles.Installed 88TPI setup with accel 6.and a comp 256 cam.Drove 3k more.Pulled oil pan for oil leak.Found cyl 6 had a bent rod and 4 piston skirts with the ends broken.Installed speed pro trw H345np pistons, scat icr5700p rods, 77rod beaing and a comp xe268 cam. From the chart the pistions have a 1.540 compression distance with 5.70 rods It measured only .022 in the hole.Measured with a straight edge and feeler gage,all cyls.Even I can't be that far off.With stock pistions at 1.525 comp. dist. Should it be about .040? The engine is now assembled.
Thanks
Thanks
01-06-2007, 07:56 PM
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Engine: 350 TPI
Transmission: 700r
Axle/Gears: ford 3.55
Stupid me.Found an old e-mail with says these are 1.560 compression pistons he sent me.The chart only shows a H345NP with 1.540 comp. dist.This explanes why the measurement looked off. Also the comp dist of a standard pistion is 1.565 not 1.525 as i stated in the question. Sorry about that.
01-06-2007, 08:02 PM
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Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
-.022 deck height is better than -.040. You'll have better quench and flame travel. Just be sure to check piston to head clearance.
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