[beltfeed]

Not only does it need to be honed, but it also looks like it may take .010" to clean up the gouges in the bore. You really need to look into why the bores are hosed after 20-30 passes, shitty tune, bad assembly etc. Last don't forget to re-calculate the piston pin, clips and ring weight into your balancing math.

 

[000Racer]

Last on I did....
80 RVK, 14 RPK, 34 RK, sealed up right away, 22" vacuum.

 

[str8liner]

My cylinders have looked like that after I eat a lifter. Trash from the lifter gets slung onto the cylinder walls and gets behind the piston skirts and ruins your day in short order. Short skirts and piston rock are hard on the bores too.

 

[Rcparker2]

first block I did with cbn finish. Had to take a .0005" after my wife's 6.4 hemi lost a cam

 

[chrisjk383]

Im quite surprised by these responses but im glad I posted the pic - I've gone to the same machine shop for probably 10-15 years and never had any issues at the track, but then again ive never tried doing a leak down test either with pressure or vacuum. I will this time around. Im going to be safe and just take the whole short block to a new shop and have it re balanced and honed per my new application. I did have a mysterious blue smoke issue at about 1000' down the track that was never determined, who knows could havwe been blow by this whole time! Any advice o what valiues are passable for a leak down test? I would like to test the assembled motor this time around... What are good vacuum numbers and over what duration of time?

 

[chrisjk383]

P.S. not sure if i mentioned yet or not but the new motor will be a 8.5:1 564CI BBC with 10psi of boost ~ Shooting for 850HP street car - not sure if this info will have any effect on responses or not

 

[SuperStockAMX]

Well...In NHRA Stock / Super Stock...if it’s hovering around 10% or more, You probably won’t bring it up amongst the crowd. Not that 10% is the end of engine life, it’s just not something to brag about. And I’m pulling my engine apart very soon as it’s LAUGHABLE leak down (on one bank only).

 

[BBF612]

Stop Honing By The Numbers

Rpk, Rk and Rvk, where do these numbers come from? Why do they change so much and so often? Utilizing new software and measuring tools, you can move beyond the numbers and actually SEE the surface texture created in your honing process. Once you can see that texture, you can begin to modify your process (abrasives, loads, etc..) to create better performing and long lasting surfaces. Ed Kiebler and Lake Speed Jr. will show you the software in action and share their experiences of honing without the numbers, but still using a profilometer.

https://register.gotowebinar.com/register/5645226278513430107