I own a 87 Z with a 305 TPI, and my question is. I am building a 383 motor. I want to know if my TPI from the 305 will work. Also I want to know where I can get a prom for the 383 motor.

 

i had a 305 and put it on a 350. if you have the earlier type base plate the intake holes need to be re-drilled because of the angle change in 87.

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87 iroc
355 cu stock 5-spd
accel fuel psi regulator
3.08 posi rear

 

Are you planning any other upgrades to the TPI other than the chip? The TPI is restrictive to a 305, with a 383 you're going to choke it for sure.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

I agree with the Kid. The 383 really promotes a lot of torque, so it is a great match for a Miniram if you are not subject to emission testing. If you are subject to emission testing, then you either have to get a "free flow" TPI intake (base, runners and plenum) or look at the Superram.

As for an eprom, there is no stock eprom as GM never made a 383 TPI. You will need a custom eprom, either from an eprom writer or (better yet) do-it-yourself.

I won't get into the long list of reasons why you should consider learning how to burn your own eproms. If your interested, scope us out on the DIY Prom Board. But if you MUST get someone else to do it, I am inclined to recommend Ed Wright of Fastchips.

I have scoped out almost every "off-the-shelf" eprom and custom eprom from the major eprom writers. Ed Wright's eprom impressed me the most as a serious effort to make an eprom that addresses both WOT and part-throttle. It can still do with some "optimization", but considering Ed does not have "hands-on" access to your car, he does a fairly good job.