Rebuilding the LT1

[metalbeast]

Exellent article on the Gen II small block ;D
www.automotiverebuilder.com/ar/ar99928.htm

[jdawgs94z]

i'm confused,i thought my 94 z28 had aluminum heads but this is saying i have the cast iron heads ,and if the cast iron heads had a better flow why is my car still rated at 275hp ,wouldnt it be a higher hp engine than the aluminum head version if it flows 20% better ???help my head is going to explode

[turtle]

jdawg, no one wants your head to explode. So to answer your question, your car does have aluminum heads. The cast iron heads were only equiped on LT1's in the full size cars.

[jdawgs94z]

thanks turtle ;D

[Green WS6]

The hot cam for the lt1, lt4 is good for only 20 horses. That sucks that means that I spend over $500 for a hot cam kit to only gain 20 hp.

[turtle]

wenceslopez said:

The hot cam for the lt1, lt4 is good for only 20 horses. That sucks that means that I spend over $500 for a hot cam kit to only gain 20 hp.

Allot of people are reporting as much as 340 rwhp with bolt ons and a good tune with that kit. IMO it's a good budget cam/rr's setup (although I would recommend upgrading the springs). I believe the 20 HP gain that the article stated was on a stock LT4 motor from the factory. The exhaust and intake on these cars are very restrictive. Just my .02

[Green WS6]

The kit comes w/ the roller rocker 1:6 upgraded springs. And the whole 9 yards. All I need is a good tune. I got a Jet chip performance on my car. If I get a tune can I still use that chip?

[Fire67]

wenceslopez said:

The kit comes w/ the roller rocker 1:6 upgraded springs. And the whole 9 yards. All I need is a good tune. I got a Jet chip performance on my car. If I get a tune can I still use that chip?

The springs are marginal for their use.
You'll gain more with supporting Bolt-ons, ex: Full exhaust, TB, Ignition system, Cold Air intake

The Jet chips just intercept and mod the information the PCM sees/sends to improve performance on mildly modified cars. Once you dig into a cam and heads, Jets definition of "mildly modified" no longer applies to your car.
Get a REAL tune for your car and sell the Jet chip if you can.
By REAL i mean; Have a professional using LT1edit, or TunerCats, or chip burning software (Depending on year), tune your PCM using real world data gathered on a chassis dyno with a wideband A/F monitor.

[Green WS6]

Who will you recomend to do this can of job? Any website. Ilive in Phoenix, so if you know someone or someplace that do this computer upgrades please let me know. Thank you for all your help.

[turtle]

Both of these companies come highly recommended for a mail order tune.

www.pcmforless.com/
www.madz28.com/

[Green WS6]

I got a tune in my car from madz28 and it really works. After installing the new computer that was upgraded especificly for my car, the car is running alot smoother. :DThe SES is still on so I guess I'll not pass emmissions.