Guest butlersZ Posted August 29, 2003 Share Posted August 29, 2003 Hey Guys, I was wondering if it is possible to put tuned port injection on an older series block and heads. I have a 283 block that I wanted to bore out to 4.00" and make it a 302. I have a pair of 327 heads with 1.94" intake and 1.60" exhaust valves that will be going on it too. Would I have to fabricate intake flanges to adapt the manifold to the heads? I'm not too familiar with small blocks just yet. Also any guesstimates on how much horse I would get from this combo: 302 Chevy 327 heads described above roller rockers 270 duration cam Edelbrock performer EPS intake performance pulleys flat top pistons Demon 625 Cfm Carb Also, what is the "ratio" mean on rocker arms? and which is better, 1.5 or 1.6? If anyone can give me any suggestions on parts to buy or use for good performance and reliability, please do. I do have a budget though. Oh, and the block is a '64 CE replacement block with 327 tooling if that means anything. Quote Link to comment Share on other sites More sharing options...
Guest greimann Posted August 29, 2003 Share Posted August 29, 2003 To sort of answer your TPI question, look at this thread: http://www.hybridz.org/phpBB2/viewtopic.php?t=24965 In short, a high revving 302 would not be a good choice for a TPI induction. Quote Link to comment Share on other sites More sharing options...
Guest 73TPIZ Posted August 29, 2003 Share Posted August 29, 2003 Butlerz, the first 2 yrs of the tpi (85-86) will bolt right up to the older heads but the 87 up units will need the center bolt holes elongated because the angles changed. I haven't done that modification but have read posts that say no big deal. I'm using an '86 unit. Greimann is right that the tpi doesn't like high rpms. A buddy of mine says his 355 w/ tpi pulls to 6200 but that's hard to believe. My 305 tpi only pulls to 5500 and larger displacements should be even worse. But the torque is wonderful and very fun around town. mine has a 3.73 gear w/ 245/60/14 tires and seems about right. 2200 rpm @60mph, high 12's in the quarter (5k in 3rd gear at end of 1/4) ,and ~20mpg when i stay off the go pedal, but then, what fun would that be. take care and good luck, charles Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted August 29, 2003 Share Posted August 29, 2003 i'm actually selling the complete TPI off my 85 vette. With everything, harness, ECM, all sensors , MAF,TB well everything. MY vette has run 13.6 with it and 12.23 on a 100 shot. this is all stock. Oh and i'll give you the heads, cam, lifters, and stock headers too. Let me know if your interested. This is still on the car so you can test drive it before purchase, as for price make me an offer. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted August 29, 2003 Share Posted August 29, 2003 I found this info and I figured you guys might like to look it over, now the first thing I want to point out is where the DATA came from. and KEEP IN MIND ITS REAR WHEEL HP AND The TPI INTAKE IN THE TEST consists of 58mm TB, fully ported plenum, AS&M large tube runners, and highly ported Edelbrock base WHICH MEANS ITS ALREADY MAKING AT LEAST 25HP-30HP MORE THAN A STOCK TPI INTAKE) http://www.eecis.udel.edu/~davis/z28/winter01/dyno/ The engine was basically the same,in all the test except for the intake manifold, consisting of a ZZ4 crate motor, AFR190 heads, LT4 HOT cam, and SLP 1-3/4" SS headers. Trans is a 700r4 with a Vigilante 2800 stall converter. The Engine Control Module (ECM) was a '92 TPI stock ECM (MAP/speed-density) with a modified EPROM. I HAVE GONE TRU AND WILL PICKED OUT THE IMPORTANT POINTS TO SAVE YOU TIME IN THE CHARTs AND GRAPHS ON THE SITE TPI engine.....283 PEAK rwhp @4800rpm peak AVG. TQ 291.5 AVG HP 269.5 thats 38 more peak hp than stock miniram 303 PEAK rwhp @6200rpm peak AVG. TQ 285.8 AVG HP 269.1 IT LOST 29 HP at 3800 rpm and MADE 48 MORE HP THAN THE stock TPI at 6300 RPM stealth ram 342 PEAK rwhp @6400rpm AVG. TQ 319 AVG HP 300 it lost 28 hp at 3600 rpm BUT GAINED 66 HP AT 6600 RPM over the stock TPI 342 rear wheel hp is aproximatly equal to 427 flywheel HP FROM A 350 SBC ENGINE, figuring a 20% driveline loss rate. the use of a longer duration cam and only measureing PEAK HP would tend to benefit the miniram and STEALTH RAM intakes to a MUCH GREATER extent than the TPI, THATS HOW claims of gains of 100hp are made for some intake combos, while its TRUE that you can make in excess of a HUNDRED EXTRA hp at 6600rpms is due more to the TPI not being able to flow air (LOSSES) keep in mind that a LARGER ENGINE DISPLACEMENT WOULD BENEFIT EVEN MORE from the steathram link to c-4 stealthram increasing the displacement from 350 to 383 and the compression ratio to 11:1 , adding the stealth ram and a cam like the CROWER #00471 or CRANE #119661 will get you over 450hp/450tq with a good set of heads like those 190cc AFR mentioned Quote Link to comment Share on other sites More sharing options...
Guest butlersZ Posted August 30, 2003 Share Posted August 30, 2003 thanks guys, helps a lot. makes me think twice about TPI. Well what about that list I put in the post? Good combo? Quote Link to comment Share on other sites More sharing options...
Guest Nic-Rebel450CA Posted August 31, 2003 Share Posted August 31, 2003 Anyone know if TBI is any better at higher RPMS vs TPI? I think I recall hearing somewhere that it was. Quote Link to comment Share on other sites More sharing options...
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