Hi there this is like my Second post so im relitively new to the board What i would like to know if im on the right track here with my mods and future mods? Right now im running the stock 305 TPI in a 86 iroc with an auto trans and limited slip rear end. SO far i have rmoved the baffels from the airbox, gutted the screens from the MAF, and im in the process for adding headers, cat and hooker cat back. One thing i would like to know is what are the best headers out there for my car..i plan on swaping in a 350 or possibley the old 327 i have in storage..so i don't want somthing that good for the 305 and for the other motors. Second(and this might seems funny) but will the TPI work on the 327? i would think so. Also i plan on porting the TPI( TB, runners, etc) for better flow..anything else you guys could tell me would help alot. Thanks

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86 IROC 305 TPI
Gutted Airbox, Modified MAF, Cat Back Exhaust System

 

As far as headers go, id have to say SLP's, bottom line. There a little on the expensive side ($400 plus accessories to make it work for your application, which ever that may be), but consideriing the fact that they are stainless steel (i think jet hot ceramic coated too, not sure though), there just about the best when complying with emissions. Since your probably doing motor swaps, these headers will switch back and forth, no sweat. as far as the 327 goes for the tpi, not sure, but i don't see why it shouldn't work. id probably go with the 350 though.

 

ok...best headers, smog legal, in my opinion are the SLP's. Get the 1 5/8" for the 305. Lingenfelter recommends 1 5/8 for 350s too, though most people think 1 3/4 is better. but he's a great engine builder so it's your choice. I'd say go 1 5/8 and they will be just fine for 305, 327, 350... The TPI system will work on a 327, no problems there. you may need a new prom though(computer chip). porting is one of the best free mods you can do, but make sure you do it with the parts off the engine and clean them of all the metal shavings before putting them back on.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei distributer
'95 3.23 rearend
hotchkis rear suspension
PST front polygraphite suspension
"speed kills. buy a f@&d, live forever."

 

Thanks for your imput the main reson im wanting to gow with the 327 is that i have almost a complete engine that just needs to be machined and cleaned up..and from what i have been told the 327 isa sweet engine. Thanks again for the input

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86 IROC 305 TPI
Gutted Airbox, Modified MAF, Cat Back Exhaust System

 

Hmm.....I'm confused. I've been told that 327's are really rev happy and usually have a high redline....and that the TPI systems have breathing problems basically above 4500. Now, considering I'm not going from personal experience, nor am I any type of mechanic....can someone explain to me what would be an advantage of a TPI 327?

NOTE: I honestly do not mean for you to take this as a flame, just wondering.

 

Dudes, it the total package, not the bore/stroke!

A 327 can be made to pull stumps with a small cam and heads, or rip your ears off as it winds out with a big cam and heads. It will work fine with a TPI if the cam and heads are well matched to it.

Shorter runners and the porting you mention will get you in the 5500 rpm range easily. Just get a cam and heads to match.

And, SLP's are not coated unless you pay more to get it done. Lingenfelter's recommendations are for long-tube headers, not shorties. If running a 327/350 with SLP's, follow their recommendations and get 1-3/4" primaries. You can put them on your 305 now and just lose a little low-end torque, but it won't kill you and you'll have them when you put in the bigger engine.

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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. ZZ4 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).

[This message has been edited by five7kid (edited November 15, 2001).]