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  #16 (permalink)  
Old 12-04-2012, 02:13 AM
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Old 12-04-2012, 08:44 AM
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I had a guy thats been working with sbc engines for around 16 years tell me I would be good to run them he said the pistons I have are the stock 22 cc dish pistons and im not just throwing it together iv did so much reading on it and asked ppl many ?s everybody tells me I should be fine running the vortecs on it but I know I am going to have to be running premium but that's fine BC the engine im going to have is going to be a monster well for me anyways and thanks for all the help everybody I wasnt trying to be a Dick
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Old 12-04-2012, 10:30 AM
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Originally Posted by smith9300 View Post
I had a guy thats been working with sbc engines for around 16 years tell me I would be good to run them he said the pistons I have are the stock 22 cc dish pistons and im not just throwing it together iv did so much reading on it and asked ppl many ?s everybody tells me I should be fine running the vortecs on it but I know I am going to have to be running premium but that's fine BC the engine im going to have is going to be a monster well for me anyways and thanks for all the help everybody I wasnt trying to be a Dick
If you're sure about the dish size you can get away w/using 64cc chambers. Just be sure the heads haven't been excessively milled by a p/o. You'd be amazed what I've seen, and if they came from ebay, craigs, etc., God only knows what may have been done to them.

It's not hard to "CC" the chambers (measure the volume). If you want to do this let us know and we can offer some low-buck tips on doing it.

Good luck.
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Old 12-04-2012, 10:50 AM
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I did get them from CL so I would like to know how plz you can pm me if its better for you
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Old 12-04-2012, 02:13 PM
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Fair chance you'll need premium to keep it from pinging.

What you want to avoid is backing the timing off from the best power timing to stop the pinging. This is because lowering the timing kills the power and mileage.

The 256 Comp cam has a relatively early intake valve closing (IC) point (55 ABDC @ 0.006" lift). What that means to you is the static compression ratio (SCR) that I estimated to be about 9.6:1 on your last thread will make the dynamic compression ratio (DCR) to be about 8.25:1. This page (written by techinspector1) will give you an idea of what CR is needed for different durations.

BUT!!! Until you know the exact static compression ratio as well as the quench distance (and that brings you back to CC'ing the combustion chambers and measuring how far down the hole your piston sits and the dish volume), this is a ballpark guess ONLY!!! To use my figures w/o checking my math and using the correct SCR might cost you an engine or at the very least cause you to tear it back down to correct the CR or to run race gas or to retard the total timing.

Online Calculators (there are others):

SCR calculator
Wallace Racing DCR calculator
Kelly DCR calculator
KB/Silvolite DCR calculator

You also need to use a vacuum advance and set the ignition timing advance curve up correctly. There are MANY threads on this. After reading up on it if you still have questions, just ask and we'll try to sort it out for you. But first you need to research it for yo'self.
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