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Anti Pump Up Lifters? #583716 01/15/10 08:24 PM 01/15/10 08:24 PM
Joined: Jan 2003 Posts: 1,620 MA R ragtop OP top fuel
ragtop OP top fuel R Joined: Jan 2003 Posts: 1,620 MA	How much RPM can be gained (until valve float) by switching to anti pump up lifters, while keeping the same valve springs. For example, if my stock 340 starts to float @ 5500 RPM, what RPM would it start to float at, by switching to these anti pump up lifters? I realize that I would have to change my push rods and go to adjustable rockers. Thanks.

Re: Anti Pump Up Lifters? [Re: ragtop] #583717 01/15/10 08:49 PM 01/15/10 08:49 PM
Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A. 5spdcuda top fuel
5spdcuda top fuel Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A.	If you're getting valve float at 5500 rpm, you might want to consider new valve springs. Every standard hydraulic lifter engine I ever had big block or small block would easily rev past 6000rpm with a performance cam and the appropriate springs.

Re: Anti Pump Up Lifters? [Re: ragtop] #583718 01/15/10 08:49 PM 01/15/10 08:49 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	5500rpm Fastest 300

Re: Anti Pump Up Lifters? [Re: Crizila] #583719 01/15/10 10:05 PM 01/15/10 10:05 PM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	Lifter pump up is caused by valve float. The valve floats, the lifter pumps up to take up the slack, the valve doesn't shut. No more RPM.

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