i am swaping out my 305 for a 350 or 383. I gotta admit you guys are relentless when it comes to cubic inches. i have 3 requierments, Tuned port injection, 400 hp, everything has to be brand new. with that said i was wondering if i should buy the zz4 385 fast burn , but i dont know if a tpi intake would bolt up. plus how could i squezze a few more ponies out.
they offer a zz383 fast burn that i would drop in vertually unmodified.if you have any other sugestions i would gladly take them.

 

No, TPI will not bolt to that combo, as it comes. However, with the Scoggin-Dickey base for Vortec heads, it can be made to do so.

You will have a VERY VERY tough time getting 400 HP out of a TPI, with ANY number of cubic inches; unless you add nitrous or something. IIRC SDPC themselves got about 360 HP out of a motor with that intake base, which is pretty darn good for ANYTHING with those long-tube runners. Also IIRC, they weren't the stock runners; I think they were Edelbrock or some such.

 

Edelbrock runners, 52mm TB, and longtube headers.

They claimed stock PROM, must have been MAF. I would think SD could be tuned to turn more.

 

Edelbrock runners, and 1 7/8" headers.

 

1-5/8" longtubes, according to their site.

 

http://www.sdpc2000.com/catalog/1578...rip-Engine.htm

Half way down:

Dyno tested with Edelbrock runners, 52mm throttle body and 1 7/8" headers.

 

Dang, either bad memory or they changed the info on their site.

Either one is possible...

 

I just purchased an 89 IROC Z28. The original 5.7 was removed and a ZZ4 crate was installed in it. It has TPI.

Where can I get technical data on this engine? I was told there is a chip in it. I do not know who's chip is in it. Will have to find it and Idea it.

If any one out there has a ZZ4 setup please drop me an email. Would like to chat with you.

I am located just outside of Phila. PA.
Thank You,

Dane R. Marley
610-896-0217 - home
610-299-6360

 

I don't know what "technical information" you would like to get but can't find; that's probably the most popular replacement high-perf engine out there. You can look at any of the GM resellers' sites, such as www.sdpc2000.com or www.paceparts.com to see what it is.

Basically, it's identical to the Vette version of the 350 TPI motor, except with a cam that's more appropriate for a carb (that being what it comes set up for) than for TPI. It's the same short block as the L98 except with updated rods and a steel crank, and the same heads that they used on the Vette. The cam is a hyd roller, 208°/221°, .474"/.510". Whoever swapped it into your car, may possibly have swapped the cam; but who knows. The ZZ4 one, while not optimized for TPI (which is highly sensitive to cam properties), still works OK with it; just not as well as a more TPI-specific one might.

Keep in mind, with the intake it comes with and a 750 Holley, it makes 345 HP; in the Vette with TPI, it made 245 HP. So don't fall into the trap of thinking that it's supposed to be 345 HP but there must be something wrong with it because your car still only runs like it has 250. The induction system you have on top of it is the limiting factor to its output, not the "ZZ4" part of it.

 

Thanks RB!

Dane

 

Cam specs are here:

https://www.thirdgen.org/techbb2/sho...hreadid=301226

I'm in no means a cam expert, so you can just look at the raw data and not the commentary.

The head flow rates are around here on the board somewhere. You may be able to dig them up by searching for the last 3 digits of the head casting number. I believe the Vette heads are 113.

For the chip, hit the DIY PROM board, and get set up to read the data off the chip and compare it to something like the ARAP bin.

 

My son and I may have to think over a new game plan for this ZZ4. I want to look at a new cam, intake, and chip set that would bring out the best performance in this engine. It runs strong but you get the feeling that it wants to do more but can't.

I know nothing about cams, intakes or chips so I will be doing a lot of research on this. I greatly appreciate all of the advice and supporting documents everyone is sending me.

Please keep it coming!

Thank You and Have a Great Day!

Dane

 

I also wanted to know where on the head can I find the casting number? I want to ID that ASAP.

Thank You!

Dane

 

Casting #'s are under the valve cover.

HP ratings are a little mis-leading. The ZZ4, like all other crates, is rated crankshaft gross, with good headers, velocity stack on the carb, and not powering any accessories. Vehicle HP, such as the L98, is crankshaft net, running alternator and water pump, with air intake and exhaust as it is in the car.

In other words, not a fair fight. Dissing the TPI L98 for having 100 fewer equines than a carb'd ZZ4 crate engine is equally not fair.

 

Thanks for the reply. I was hoping I didn't have to pull the value cover but I will.

A 100 horse is a lot to me. My son wants to sell the Camaro but I want to see if I can upgrade the ZZ4 and get those 100 ponies back plus.

I just had a 95 GT totaled that had a 347 stroker in it and a work trans. It hauled ***. It dyno 360 hp to the rear wheels. I was hoping that this IROC would come close. I have owned Camaros when younger and my son and I want to get back to a chevy. The GT was the only Ford muscle car that I have ever owned.

Just an FYI I bought the 95GT back from the insurance company. Parted it out and made back what I paid the insurance company. I kept the engine and trans so I can do another one.

Thank You,

Dane

 

See if you can spot the casting number from the oil fill hole. I can spot them on my L98/B2L that way.

 

400 crank hp wouldnt be that hard with TPI and a 383.

on a 350, its pushing it abit but still possible i think... with a big enough cam that fits TPI and great flowing heads, 400 can be done. it comes down to the tune tho to make that power.

there is a thread on TPI intakes on a 383 and the differences in each company's product. on that 383, they made 460hp with TPIS big tube/big mouth combo with trick flow 195 heads. the cam spec'd out at over 230 degrees duration which is big but with a great tune can be possible.

 

Thanks Guys! I will look for the casting numbes this week. Didn't have time to pull value cover and check on head casting number.

I do enjoy exploring new options to do to this IROC. I would like to look at the 383 build. Till look for that thread on TPI and a 383.

Thanks for the Advice!

Have a Great Day!

Dane