[ry57pont]

Crower 60311 vs xe 274 dyno results

I was able to get to the dyno today. Just thought I would post the results. My objective is not to bash the XE, but to give some solid numbers for comparison.

462 out of the box 87cc e-head. Performer RPM holley 830 annular with 850 quickfuel base. 1.65 rockers crower 60311s duration @ .050 i=247 e=252

1st pull with a 1” 4 hole 37 deg.
533.5 ft lbs@ 4300
497hp @ 5500

2nd pull with a 1” cloverleaf open
536.9 ft lbs@ 4400
502.8 hp @ 5500

3rd pull with a quickfuel 1” super sucker
536.2 ft lbs @ 4300
502 hp @ 5400


As compared to my previous dyno pulls with the xe 274h 1.5 rockers duration @ .050 i=230 e=236

1st pull with a 1” 4 hole
554 ft lbs @ 3900
465.5 hp @ 5100

2nd pull with a 1” cloverleaf
548 ft lbs @ 4000
469.5 hp @ 5000

all pulls done on 92octane

In conclusion it looks like I lost some low end torque to the crower solid but gained 30hp and moved the rpm up a little. I guess the timeslip will be the final judge, but I thought you all would find this info useful/interesting.
I did learn that the upper valve cover mounting holes are tapped into the intake runners and should be sealed. Thanks to Ron at R & R performance for pointing that out to me, and thanks to Ed Boserma for lending a hand during the session, and to all the PY board for advise!

FWIW Ryan

PS, please dont let me do any more mods, call my wife if i start talking about needing more HP.