Just wondering if i could get some STOCK specs on the LB9 (305 tpi) pushrods, what length are they? and do they need to be "hardened"? Hydraulic flat tappet btw, no guide plates, uses head bores.


THANKS

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

I don't have the length in inches in front of me, but they are the same length as all SBC's from 1955 to 1986. The roller lifter engines used .100" shorter pieces.

They don't need to be hardened unless you use guide plates.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet (Holley 3310 on the way), GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

I would use hardened pushrods anyway, as your rockers arn't self aligning, they rub in the 'guide holes' in the head.

I'm not sure off hand, but Summit could hook you up. There's three basic lengths: 1. Standard hyd flat cam, 2. Factory Hyd. roller and 3. Aftermarket 'retrofit' hyd roller.

You need #3 because the aftermarket retrofit (You are using the 85 block right?) rollers are not the same length as the factory type roller pushrods.

 

He said "hydraulic flat tappet".

 

Thank you for straightening him out

these are roller tip

I dont need guide plates
but do need some pushrods

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

Stock length IIRC is 7.795", or commonly 7.8" in most of the aftermarket product lines.

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