blockzilla parts

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blockzilla parts

Postby jr drag dad » Sat Nov 18, 2017 3:30 am

Hi, I recently purchased a bz1 from a guy who said it needed to be freshened. Apparently he knows not much about it. He gave me a new arc rod with bearing and new front and rear seals. The piston measures 2.770 and has a single thin groove for the compression ring and a second much wider groove for the oil ring,,,,, There is no markings on the piston to identify it. Any ideas on how to find a set of piston rings ? Also what is the best cam to run for this engine if we run about 7500 adjusted altitude ? it currently has a dyno 127 but looks kinda rough, Thanks in advance
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Re: blockzilla parts

Postby jr drag dad » Wed Nov 22, 2017 10:09 pm

Any one ???
Ideas on piston identifying or cam selection?
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Re: blockzilla parts

Postby WILD BILL » Thu Nov 23, 2017 9:06 am

I found 2.776 rings at both Blossom.....

http://www.blossomracingengines.com/2776.html

And JR Race Car.....

https://www.jrracecar.com/ring-set-for-2-776-bore-1/

As for the cam, What looks rough about it? Most need some grinding done to clear the rod and crank but if the surfaces of the lobes look OK it should be fine to run.

I never changed cam when running at Bristol so I would think the profile you have now would work.

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Re: blockzilla parts

Postby Pool Man » Thu Nov 23, 2017 10:44 am

If between the lobes is what looks rough you may want to just replace the cam. Even tho the cam does have to be ground in the blockzilla blocks usually, it should at least be smooth. If not the roughness could IMO be cause for it to start a crack in that area.
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Re: blockzilla parts

Postby jr drag dad » Thu Nov 23, 2017 2:46 pm

Thanks guys, The cam gear is so pitted and rusty looking I can't even see the dyno logo much less the timing marks and the lobes are pitted and rough (looks like the oil wasn't changed often) so I'm sure replacement is needed,,,.,,,,,Bigger isn't always better , What would you recommend a 121 , 125 , or 127 ? Engine is a blockzilla 1 ,,,,, 2 .77 bore with a .563 lunati crank,,, The car and driver is fairly light at 340 lbs. ,,, Trying to run as close to 8.90 as possible.... Our adjusted altitude is usually around 7 - 7500 feet if that affects the cam decision , THANKS
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