Valve lock question

kid vishus · Post by **kid vishus** » Tue Dec 21, 2004 9:45 pm

Howdy all, new guy here with a question.

I am in the process of fixing my damaged bracket motor, and was wondering which is better, 10* locks, or Super 7's. I have heard both ways. I have run both and never had any problems with either, but I would prefer to run whichever is best.

If it matters, the motor is a 402" SBF that should 'see' max rpm of 7200, shift point around 6600 or so. It is 4" bore, 4" stroke, 15-1 compression, solid roller cam 276/286 @ .050 .714/.714 lift 108 lsa, ported/epoxied 4v cleveland heads that flow 360/249 cfm @ .700 lift.

jacksoni · Post by **jacksoni** » Tue Dec 21, 2004 10:04 pm

Side question- what 4v head?

kid vishus · Post by **kid vishus** » Tue Dec 21, 2004 10:35 pm

They are '70 factory iron closed chamber heads that have been milled to 60 cc chambers.

EngineTech1 · Post by **EngineTech1** » Tue Dec 21, 2004 10:49 pm

I prefer to run super 7 style on everything because I feel it is stronger and has better clamping capacity, but in most situations I have seen the 10 deg stuff work just fine it is also super common and readily available almost anywhere. We use plenty on 10 deg stuff but on the best endurance and drag engines we use del west which is super 7.

kid vishus · Post by **kid vishus** » Fri Dec 24, 2004 8:46 am

Thanks.

Since the heads had cheap valves in them, most of which are now bent, I will start over in that department; new valves, new retainers, new locks.

ChrisU · Post by **ChrisU** » Fri Dec 24, 2004 3:12 pm

7 degree collet has a higher clamping force. The Super 7's are thicker in construction as well. I have seen plenty of 10 degree locks crack.