70ChargerRT
Well-Known Member
I thought I knew all I needed to know about HR,s for a 440 but obviously I didn't. I didn't realize the problems of HR,s if the lifter bores on the bottom are worn. I know of the fix with shims. My machinist is going to check my lifter bores this week and hopefully they are good. If they are good is there any other problems I may have by using them? I'm so up in there air right now because I've had several builders from the Mopar community telling me I should have went solid flat tappet and save my money but here's the problem. I've already bought my parts. Yeah I've called everyone and they said return them and we'll swap you out or give you your money back but I really like the idea of running the HR,s if my lifter bores aren't wore out. I know some of you browse the same forums but it seems they are also a lot of knowledgeable guys on here also that don't use the other forums. This is the parts I have already bought and my engine combo. I'm not going to change my bottom end but may change the top end if I like the recommendations better. It's a 68 block bored 40 over. The crank is turned with ARP rod bolts. I'm running light weight forged racetec pistons with a final CR of 10.7:1. The block has been decked and be running Zero deck height. I'm using TF 240 heads with spring for HR,s. I'm also using TF HR lifters. TF claims their lifter don't have the bleed off like some others do like comp. I called comp and they recommend not go past 6200 RPM. TF says theirs is good to 6500 RPM but have taken them to 7,000 RPM many times on their 440 test mule and they are holding up good. For a cam I've got the comp XR 286 HR and the intake is a performer RPM look alike (Mopar Performance) I'm thinking about sending it back for a street dominator. May could use added Hood clearance on my Charger and top it off with a 850 DP of some type. Will get the pushrods custom made. I'm also using a T-56 Magum for my tranny. It's been a major PITA getting my car back together but putting this engine combo together has been the toughest. Id just like to have piece of mind after I get this motor together but it seems like no matter route I decide to do their is a downfall to both the HR setup or Flat tappet. Any help is much appreciated.