im getting an LB9 out of a 89 iroc z i believe has 230hp and 295 ft/lbs...
i also have a set of 305 heads casting number 520 (which is apparently the same as the other 305 vortec heads, no swirl ports...) say i put those heads on stock (no potrting or anything...) along with the stock tpi (with a edelbrock tpi baseplate) would the t5 hold up to it? because i was once told that the heads will be at least a 30hp increase from tpi heads...
the 520 heads are the same as the iron lt1 heads but with regular coolant passages, i want to make sure im not gonna break the trans... i have been told that there are some cars with t5s in the mid to high 12s... but they didnt say what they were making, although i dont intend for it to make enough to get even past high 13s low 14s... but still wanna make sure...
thank you

 

you'll be okay...I don't know about getting 30horse out of those heads...but you still should be okay..

 

cool... i was gonna tune it get the edelbrock baseplate, eventually the runners, and lt4 lightweight valves sprigns etc etc and call it a day but i started thinking... the t5 is kinda weak from what i hear...
but its gonna be stock other wise... i wanna make sure i beat my friends 09 stang... its a v6, but they still run low 15s from the factory...

 

t5's are very weak....don't slam shift it...

 

i dont inted to power shift i actually use the clutch... but i want to be able to race it at the track occasionally and have it not break... oh well if it breaks ill have to save and get a tko500...
thank you

 

It will work fine as long as you do not power shift it. I ram ny 305 5sp car to mid 13 without it breaking.

 

good to hear that... i found a lt1 cam out of a 95 z28, guy aid its the biggest lt1 cam from the factory... but that and the heads with lt4 valves springs etc and a sdparts tpi base and a nice tune... hopefully mid 14s...
is 9.7 comp safe with iron heads? i was thinking of using the .015 thick head gasket to increase comp... but for now that would satisfy me... my goal of mid 14s...