Piston usage

Old 05-26-2010, 12:12 PM
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stevefel
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Default Piston usage

Can you use a 18* sbc piston with a sbc 23* cyl. head? I know the comp. ratio will change due to the valve angle but that is all I know. Please do not hate on me. I do not know anything about the 18* stuff. Thanks for your help in advance. :lol:
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Old 05-26-2010, 01:01 PM
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curtisreed
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You could run into piston to valve clearance issues. This would have to be checked.

Curtis
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Old 05-26-2010, 01:05 PM
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stevefel
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Yes, I did think of that. I would check this first, I can get a great deal on the 18* pistons, but again I do not know enough about them to try it. Thaks for the reply.
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Old 05-26-2010, 01:08 PM
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curtisreed
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Would it save you enough if you had to go in and have someone cut the valve pockets to clear though. That's if you have enough material in the piston tops to cut.
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Old 05-26-2010, 02:03 PM
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stevefel
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So that would help me understand the 18* thing, so the valve is at 18* and the 23* valve is more straight up and down? If the was the case, wouldn't the 23* valve travel less deeper in the piston? Thanks again for your input.
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Old 05-26-2010, 04:56 PM
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Tod74
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Originally Posted by stevefel
So that would help me understand the 18* thing, so the valve is at 18* and the 23* valve is more straight up and down? .

I believe you got that backwards.
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Old 05-26-2010, 05:03 PM
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curtisreed
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You do have it backwards. The 23 valves will go deeper into the piston.
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Old 05-27-2010, 05:10 AM
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oldandtired
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Originally Posted by doorracer
You do have it backwards. The 23 valves will go deeper into the piston.
x2. To say it another way, it's safer to use 18* heads on a 23* piston.
Dave
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Old 05-27-2010, 06:16 AM
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stevefel
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Ok, thank all of yall for your knowledge. Now just gota talk the wife into spending the money and buying the correct piston. Thanks again to everybody.
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Old 05-27-2010, 06:57 AM
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curtisreed
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OR, you could talk her into buying the 18 heads. Tell her about all the money you will save on those pistons. LOL

Curtis

P.S. It may be possible that those pistons would work depending on your cam lift, piston to deck dim., etc. Just don't know for sure.
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