johnny090881

iTrader: (1)

Ok i've got a 88 camaro that had a tbi setup with the t-5 now I'm installing a tpi setup, new cam w/lifters it's duration is 224/234 and the lift is 465/488 new valve spring kit, but just don't know what to do with heads or just leave them stock the casting numbers are 14102187. Oh yeah planing to get new rockers but also don't know what to get 1.5 ratio or 1.6

scamaro355

only thing you could really do is a port job on them, or just save up and get ya something like a new set of afr's....either way i hope you have someone that is good at tuning a tpi with that cam...

johnny090881

iTrader: (1)

Why you say that? you think is to big of a cam?

scamaro355

no its not to big of a cam by any means....it just wont work well at all with a stock tune

johnny090881

iTrader: (1)

I'm also port and polishing the intake manifold, runners and plenium. So your suggesting to also do the heads?

scamaro355

oh yeah...just be very carefull around the valve seats, use you gasket to port match you intake with your heads...anything you can do to "clean up" a factory head will be an improvement

johnny090881

iTrader: (1)

Ok thanks. Appreciate the info, how much extra horsepower do you think that will boost me from the tbi swap to with what I'm doing?

scamaro355

mostly it'll be a big torque increase.....not sure on numbers...but trust me you'll like it

GTA Sammy

iTrader: (1)

Check to make sure that your stock heads will handle the .488" lift with 1.5 Rockers... (.520" lift with 1.6 rockers) before the valve seals get crushed.

scamaro355 is right.... you'll need to do some tuning to your prom for the car to run right.
I'm not sure what those 187's flow but if your porting everything before them you might as well do your heads as well... Find some 305 World SR heads they have 58 cc chambers and 170 cc intake ports...
my 2 cents
https://www.thirdgen.org/mods2
https://www.thirdgen.org/mods3
http://www.ws6transam.org/ported.html

johnny090881

iTrader: (1)

Cool cool thanks for all that info guys, needed it before I put everything together, just wanted to do everything all at once so I won't have to do any more work to it for a while then I'll just go with a 350 later. By the way you think I should just go with the 1.6 ratio rockers?

scamaro355

i guess i missed the part about the 1.6 rockers with that cam, most of the time your lucky if you can get away with .480 lift with stock springs and no machine work. Just to be safe if you gonna use that cam with those heads id go with the 1.5 because unless you do some serious work to those heads anything past that most likely isnt gonna make much of a difference

garys87camaro

I have an original 1987 Camaro IROC Z-28 with a 305 TPI automatic transmission. My plan is to replace it with a four bolt main 350 with 2.02, 1.60 valves, 64 cc chambers. I would like to keep the stock set-up for the TPI. Here’s my concerns: Will the intake bolt up to 2.02 heads and give enough swirl for the injection system to work adequately or should I look for 1.94" intake valves (1.60" exhaust optional), heads providing I include the rest of the package with adequate (cam, exhaust, etc.) will this work? I would like to stay with flat top pistons and adjust to around 10:1 ratio if possible.
Can anyone tell me what issues I will run into and recommendations in making the swap?

scamaro355

i can only think of 2 problems off the top of my head...the first being with heads...as far as the old school 2.02 heads the heads off of a L98 with the 1.94 valves will outflow them...and watch the amount of lift you go with on the cam...you could run into bind issues with the valvesprings...Hope you have someone that can do a tune on this for you because you WILL NEED IT!... good luck with the swap

garys87camaro

Thanks for the feedback, I'm finding out the orginal intake for the 305 has a vortec style mounting for the two center bolts around the water jacket and the heads I use must have the same style. This is a problem unless I can replace the intake to something that will work for common 2.02 heads. Is the 350 TPI the same style manifold to head bolt up as the 305?

scamaro355

i was just reading my last thread....the 2.02 heads will not clear the 305's small bore so be carefull with cam choices...and the 350 intake is the same..the injectors are the only difference