This may be a dumb question, but can I slap a 11” clutch into my stock system without a new bell housing and flywheel? I'm just getting into the research of replacing my clutch. I have an 80 z28 with a super T-10. Im pretty sure stock clutch is 10.5”. Do they interchange or should I stick with a 10.5” to avoid project cost runaway etc? Sorry if this has been covered before, I couldn't find anything relevant.
If the car came with the 10.4" clutch, you can't simply put in a 11" one in its place. The bell housing is different and will be too small. If you have the larger bell housing, then an 11" clutch and flywheel will fit.
If your car has a dual drilled flywheel, then the bell housing is large enough 11 inch clutch and pressure plate will fit.
In 78 all Z/28s came with a 11 inch clutch. bell housing is the same for 10.4 and 11 inch clutch, starter nose is different
why add more mass...just get a good 10.4 clutch...unless you are really hooking up the rearend (unlikely) all an 11" clutch will do for you is add rotational weight (yes you might get a couple lb's of free torque due to the extra MASS) but certainly neither gain/loss is worth changing flywheel (if needed), starter (if new flywheel) bellhousing ....xxxxx IF NEEDED....now if you have a dual pattern flywheel ...sure get whatever you like...costs the same
I am going to use a L88 nodular iron flywheel weighs 15 pounds bought it new in 1980. Went to install starter block did not have inline holes.
I'm using the 15 lb GM L-88 flywheel in my '69 vette with a Hays 10.4 in street/strip clutch. Its a real hoot to drive as it engine brakes like a banshee making the on/off throttle transitions a blast coupled with the right tranny/gearing. My car is about 2800 lbs and I have 3:73 out back with a 2.87 1st gear close ratio road race 5 speed (TKO600RR). I'd caution against running it in a 3500 lb car with average gearing
15lb is very aggressive in a Camaro. It’s a heavy car. I just installed a T56 behind a 520hp carb 406 with a healthy cam and big carb and used a 25lb Ram billet Steel. Standard weight for a small block is 31-34lbs. I wouldn’t go under 20 unless you have very low gears and a pretty mild cam or EFI. I did run a 15lb in a C4 but that was a 3000lb car and had a mild solid roller with efi and I ran lots of part throttle timing off idle plus it had 4.30 gears. My rear now is only a 3.42 and it’s not ideal with the big cam. I was planning to go 3.70 but more likely will bump up to a 3.89 gear for better drive ability. It’s not bad now but you have to give it some slip off the line for sure. Especially when the motor is a bit cold. Better once warmed up. And I’m running a 1200rpm idle too.
