Alternative Port EFI Intakes This board is for tech discussions and questions about aftermarket port EFI such as the HSR, MR, SR, BBK, FIRST, etc.

HSR help with bolts please

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Old 08-21-2015, 12:57 AM
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Car: 92 1500p\u 2wd
Engine: 91 z28 tpi 355
Transmission: 91 700r4
HSR help with bolts please

Can anyone tell me what size the 4 bolts are that run through the plenum into the base...they keep the plenum clamped to the base. I bought a used HSR and it never came with bolts. Also holleys tech support line sucks! On hold for way to long so I thought I would try you guys. Thanks for the help!
Old 08-22-2015, 06:06 PM
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Re: HSR help with bolts please

5/16" - 18 x 4" L, allen head bolt
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