Measuring for Correct Pushrod Length in my SBF

In this video, I use a Comp Cams 7701-1 pushrod length checking tool in order to determine the correct pushrod length for my engine. While this is a stock 289 block, I am running a Comp Cams 31-1000CPG retro-fit hydraulic roller cam kit with Comp Cam 851-16 roller lifters, a Comp Cams 31-601-8 Thumpr Cam, AFR Renegade 185 Series heads, and Scorpion SCP1018 1.6 ratio roller rocker arms. The stock pushrod length is 6.8 inches, but that is too long for this application. Using the tool, I determined that the correct length was 6.5 inches, so I ordered and installed a set of Comp Cams 7767-16 pushrods.

[@LoBelly]

looks like its going to be a nice little mill - enjoying watching your progress 👍

[@billsgarage]

Thanks!

[@Burnedtoastify]

Great advice in this video... We built up a '96 Explorer motor (5.0 HO/GT40) and installed a TFS1 cam, spring kit and new head gaskets. Lots of tapping on start up. Turned out we needed to go from the stock 6.250 pushrods up to 6.300.

[@billsgarage]

That's a noise that will definitely get your attention! Thanks for watching.

[@kevdaceo]

Great info as my brother and I will be working on a 351w build

[@billsgarage]

Awesome, good luck with your project!

[@renc3920]

Very handy and in-depth instructional. I'm just finishing doing some light port work on a set of gt40p's and this video just might come in handy for next steps. Thanks!

[@billsgarage]

Awesome, glad to help - good luck and thanks for watching!

[@jeremyjenks]

proper demonstration

[@billsgarage]

Thanks for watching!

[@eddiearchuleta615]

Does this need to be done with the head gasket on and torqued down? Also I have a 289 set up with comp cam magnum 280h flat tappet cam with flat tappet lifters I’m ordering the afr 165 with the flat tappet cam spring exchange but using 1.6 Harland sharp roller rockers I wonder what length I’m going to need

[@billsgarage]

The head gasket should be in place, but you can just snug the bolts/studs, no need to torque them for this check.

[@eddiearchuleta615]

Awesome thank you can’t wait getting the c4 trans rebuilt and a 3500 stall converter will be going in hoping for 400 or so hp car only weighs 2700 lbs

[@johnnyhonda7576]

Is this a hyd roller or tappet engine? What did you do to keep them pumped up? Just soak them?

[@billsgarage]

It's a hydraulic roller cam, but there's no need to worry about keeping the lifters pumped up if you install checking springs on the valves. The springs inside the lifters are stronger than the checking springs installed on the valves, to the lifters will not collapse when opening the valves.

[@johnnyhonda7576]

@@billsgarage if you have a hydraulic roller pumped up, will it stay pumped up thru 2 revolutions of a engine if not using checking springs, for final valve adjustment?

[@DanielBuchanan-oh2eq]

⁠@@johnnyhonda7576i second this question as im literally about to check pushrods tomorrow and don’t have the checking springs lol