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Old 01-23-2008, 04:27 PM
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SBC 350 Tuned port info

I need help. I have built many engines but never fuel injected.The short block I have is 5.7 LG ,10243880 it is a 1998 with dish pistons factory stock. I picked up these heads off a crate mexico motor 33417369 and 76cc. I would like to know what compression ratio it should be with these heads. I also have a tuned port set up.I need to know about using the mass or map sensor and what wire harness is best and what cam I can put for good low end street performance.And what injectors.Any other info I need please tell me. Thanks to anybody that has experience with this or at least can tell me compression ratio.

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Old 01-23-2008, 05:55 PM
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Call Mr.Mark at street & performance.They will be glad to tell you all you need to know.
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Old 01-23-2008, 06:59 PM
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33417369 is your number. They are 76cc smoggers. With dished pistons you're looking at abyssmally low compression, like possibly in the 7.5:1 range. I'd go with better heads.
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Old 01-23-2008, 08:09 PM
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Thanks, It is that they only have 14,000 miles since new and they where free. How much difference would flat top pistons make with same heads?
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Old 01-23-2008, 08:28 PM
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About half a point.
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Old 01-23-2008, 08:34 PM
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Guess I will just buy a rotating assembly and build a 383.Thanks everybody.
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Old 01-23-2008, 08:55 PM
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Well, that's up to you, but some 64cc heads like vortecs would make a very decent compression and a killer street motor. The TPI won't work with vortecs, but there are lots of 64cc traditional heads that will.
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Old 01-23-2008, 09:51 PM
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http://www.sdparts.com/product/12498...Baseplate.aspx

Here you go....slap on some Vortecs and this intake....
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Old 01-24-2008, 06:09 AM
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Thanks for the intake info and the vortec head info. Sounds like a plan. Now could anybody tell me what compression I would have and some details off running the tunned port?
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Old 01-24-2008, 01:09 PM
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How much dish on the pistons?
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Old 01-24-2008, 01:27 PM
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Dish is .063 with double eye brows.
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