z28romance

Is this possible? i had a 305 HO in an 87 monte SS and i loved it. lots of torque and high end power. I wonder if its possible to convert the 305 tpi (fresh reman) in my camaro to the same specs as the monte engine.

Apeiron

Same specs, as in put a carb on it?

z28romance

I know my monte had a carb, but i was wondering if i could get close with the tpi. i know if i change the cam i need a new prom.

midias

Maybe I am wrong but a stock TPI shoudl make 25-35 more hp than a carb HO montecarlo. Sounds like your TPI is not working right.

z28romance

it probably isn't. i haven't had much of a chance to drive it though. i have been going through the painful process of un-doing alot of stupidity the PO left me to figure out. my last camaro was an 86 z28 that the PO had ripped off the tpi and carbed it. i guess ill finish fixing it and see how it goes.

midias

Yea get it running right I don't think you will want to go back to a CCC.

z28romance

hopefully, all i have left is a new distributor.

Apeiron

It already is, apart from the induction system.

z28romance

so my 305 tpi is has nearly the same cam/pistons as the 305 HO?

midias

probably similar I think the monte SS made about 170hp and the TPI should be about 215 when working right. Getting the car to 305HO specs would be a downgrade.

z28romance

guess it's a good thing i asked then. LOL. i guess this poor tpi has been abused and misused. the montecarlo used to break em loose with no effort.

midias

Just realized you have a TPI auto

87 Z28 A4 LB9 V8 9.3:1 5.0 (305) 190@4000 295@3200 TPI 2.73


Looks like you only get 190 not 215hp Also looks like you probably have 2.73 gears ouch. I think the 87SS got 3.73 gears and that would make a world of difference.

z28romance

i am eventually planning on putting an IROC disk rear axle in this car. what was the gears in a third gen IROC rear?

midias

Changes from year to year could be 2.73 to 3.42.

https://www.thirdgen.org/tech-data

Here is a list of every year and rear option.

I think all bird L69s were 3.73

My friend has 2.73 on his mild 350 TA auto and second is a dog until her gets the RPMs up. 2.73 really slow the car.

z28romance

im guessing this will lead to much higher RPMs on the highway.

midias

You got it. For an auto I would suggest staying around 3.40, 3.73 will make 1st way to steep IMHO.

z28romance

It looks like the 87 305 M/T came with the same heads the 350 A/T had that same year. so if i can find those heasd it should really up the HP right?

midias

I don't know if that is correct. I thought all 305 heads were 58cc chambers and 350 were different but I could be VERY wrong.

Pull a valve cover and see what heads you have now. For a 305 you may just want to put in 1.94, 1.60 valves and give them a nice P&P.

z28romance

I don't know if the volume is the same. good point. what heads do you suppose i should use on this and keep the lower end stock?

midias

The only aftermarket heads I can think of are trickflow and world products.

Personally I would punch them out for 1.94, 1.5 valves and port and polish them.

z28romance

I suppose i should stab this new dist, see how it feels and go from there. not looking to race it, just drive it like a jack a$$.

midias

Step 1: Get it running right
Step 2: Save Money get the rear rebuilt with 3.42 gears
Step 3:
Step 4: Profit