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I asked ths exact question on Raso fuels propane forum. There is just not alot of guys on forums who have pushed the limits on this, and but there are a few. My personal experience, mostly with small cam, iron head Big Block Chevy engines and some Ford and Dodge big blocks is 10.25 is a good...

Of course, the right answer is to properly balance the crank to the new piston/rod assemblies. I have done that with builds in the past, and will likely do it in the future, but this time I can't spend the extra $ for balancing. My understanding is that there are very complex things going on...

Thanks for the replies! I will just re-use the stock pistons if I can't trim enough weight from these new ones to get them into an acceptable range. Stock press fit pins are 151g New press fit pins are 152 There is 8g difference in the old vs new rings - the originals are shallow groove, so are...

I have run into a snag with component weights for my 454 project. I am just freshening this engine, but am using new dome pistons to raise compression. I do not want to have to re-balance the stock crank, but the new piston/pin/ring assembly weighs a whopping 68 grams more than the stock...

Thank-you for the replies!

Thanks for the replies everyone! Cast rings are recommended in old propane training manuals. I used to work in the industry during the 80's and 90's. I know moly is a bit better, but I thought plain cast might seat in quicker. I might be wrong, but I doubt it's a deal breaker for this build.

Yes, I should have clarified the reason for breaking in on propane is that it will be run on propane only afterwards.

I am freshening up a Gen 6 454 for my daily driver. Boring and honing are not in the budget, and the stock bores are ok, so they will be de-glazed with my 320 grit ball hone. I am using plain cast iron rings, and new small dome pistons to achieve a bit over 10:1 compression. I would like to...