3.4 DOHC Torque Plate

Real tech discussion on design, fabrication, testing, development of custom or adapted parts for Pontiac Fieros. Not questions about the power a CAI will give.

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Series8217
1988 Fiero Track Car
Posts: 6065
Joined: Thu Jun 02, 2005 9:47 pm
Location: Los Angeles, CA

3.4 DOHC Torque Plate

Post by Series8217 »

Just a note for anyone building up a 3.4 DOHC:
BHJ (www.bhjinc.com) made a torque plate (honing plate) for the motor using my head dimensions and head gasket as a template. It is not listed in their catalog but you should be able to call them and order it. It's expensive and your machine shop may not want to buy one just to do your block, so if you're in central or northern California, you can get your block honed at Rossi's Engine and Drivetrain in Gilroy, since Paul Rossi has the first plate they built for my motor. The phone number is 408 8425950. Tell him Steven sent you.

My block was bored without the plate and then honed round to final bore size using the plate, so we were able to see how much the block distorts with the heads torqued on. The cylinder walls were definitely pulled out of shape as we could see by the initial hone pattern where it initially missed the areas pulled wide by the distortion of the block. I highly recommend honing with the torque plate to get the best possible ring seal.
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