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[Bruce Wilcox (EUS)]

Hi Guys,

I might be able to contribute to the TPI combustion chamber volume question.
My 1987 IROC-Z was built as a 5.0L TPI / T5 transmission combination. During
the planning phase of the 355 TPI project, I ran into this problem. I
measured the 5.0L combustion chamber volume (after carbon removal) and it
was close to 55 cc. It is true that the 5.7L engine combustion chamber
volume was 58 cc. 

I looked at many different heads and consulted with my uncle (induction
system specialist). The best overall head (horsepower/dollar & emissions) is
the Airflow Research (AFR) 190 series. The GM Corvette head would need a
fair amount of work (missing EGR port, etc.) to bring it within the stock
performance (power, emissions) of the AFR option. I use this head on my 355
TPI motor (dyno results: 342 BHP @ 5200 RPM, 410 ft.- lbs @ 3900 RPM) and it
has performed outstanding to date.

Best Regards,

Bruce

Bruce E. Wilcox
Sr. Staff Engineer
Ericsson Inc.

Bruce.Wilcox at ericsson.com
wilcox at rtp.ericsson.se

919-472-7054 (phone)
919-472-1103 (fax)