| Re: Make a 350 out of a 400??? |
Subject: Re: Make a 350 out of a 400??? by rklessdriver on 2009/7/13 13:48:37 I have never liked the 60* V-6 hy roller lifter deal. It's a neat way to use parts from an otherwise completely worthless engine family but it has some potential problems I would rather just not deal with. Something about drilling for the tie bar retiner (spyder) and then having the tie bars (dog bones) sitting on the unmachined/as cast top of the lifter bore just doesn't sit well with me in any hi-performance application. Also depending on the base circle of the camshaft the oil band is not really in the right place and you could end up relying on oil seeping thru the lifter bore clearance to get oil to the topend... Now add in the fact that good retro fit hyd roller lifters are getting cheaper all the time.... http://www.competitionproducts.com/prodinfo.asp?number=91164 When you add in how much labor it is to do all that iffy work to make 60* V-6 lifters work in a SBC you almost at the point of diminishing return considering the retro fit vertical tie bar lifters are a proven hi-performance part. The only ones I've seen fail were owned by morons who didn't have enough spring pressure to control the valve train at the RPM they were turning and vlave float/lifter bounce destroyed them. The retro fit lifters are heavy and in a SBC you needed around 145 lbs/380 lbs to turn 6500RPM with them on a decent cam profile back in the mid 90's. Todays hyd roller profiles have come a long way with the opening/closing ramps so you may get away with a little less spring if you utilize the newer grinds. Will |
