My buddy is probably going to be between prop sizes. He is spinning labbed 30's @ 5700. He really didn't totally stretch the boat out because the motors are new. I think he might get another 50 rpms. The temps were in the low to mid 80's.
So how much will he lose in rpms when the summer heat kicks in. The motor are 502's with aftermarket heads and cams with the new top mount whipples.
Is their anything bad about the 32 pitch Bravos?
I think he will lose about 150 to 200 r's when the heat kicks in. This would put him around 5550 to 5575 (guess work).
I think this is still a little high for hyd. roller cams.
With the blowers he should still be able to pull the 32's pretty decent. If they are labbed he could be around 5200 to 5300????
Most of his boating is cruising. I feel like he will get a bigger bang for his buck with the 32's. Better cruise and maybe more top end. He just won't get there as quick in time frame.

So the ?
Should he put on labbed 32s or should he send the 30 and have some cup put in them or just leave them the hell alone.


I know these are all loaded ?s But input helps decrease test time.

Go with the B32's and sell me the 30's!!

Hey Mike,
just my opinion, but I would think the 30's with added cup would be more efficient.
Another thought is that if the Whipples are intercooled he may not loose too much.
Just thoughts...
Dave

Just like you know the whipples are innercooled so it should not hurt that much and 5700 is fine ,add so cup to the 30's and it should be perfect 32's would maybe faster top end but might load it more of the time and get worse fuel useage crusing
My vote stay with the 30's and get it to 56 or so

I think Keith will be able to try the labbed 32s next weekend. I'll let you all know when he lets me.