Thread: tune a 350 thats modified?

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You can use the Internet to figure this out. On the passenger side of the block just above the water pump you should find the block serial number. Then check it against the Mortec list:

http://www.mortec.com/

The heads may not match the block so remove one of the valve covers and look for the casting number in between the valve springs to check against:

http://www.lpcinc.us/headcodes.htm

There are a lot of possible combinations of heads and blocks between 327 and 350s. Once you determine the casting numbers of the heads you can compare to the flow numbers for the more common performance heads.

http://chevyhiperformance.com/techarticles/41598/

There are many other Internet sites for Chevy engines, so many that you will be amazed. Check out Ryan's site for a way to estimate the performance of your engine.

http://www.ryanscarpage.50megs.com/combos1.html

Best Wishes,
Don Shillady
Retired Scientist/teen rodder