Im in the process of putting a contengency plan together for my 383. my current head set up with the hydroller is good to .600 lift, this is with the +.050 valves. if i go to a solid roller will i have to go to +.100 valves to get over the .600 lift "OR" can i select a spring that will allow the proper springs pressurs and more lift room? thanks Dave
solid rollers and valve lift
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Im in the process of putting a contengency plan together for my 383. my current head set up with the hydroller is good to .600 lift, this is with the +.050 valves. if i go to a solid roller will i have to go to +.100 valves to get over the .600 lift "OR" can i select a spring that will allow the proper springs pressurs and more lift room? thanks Dave
Dave,
What is your current installed height? You may be able to just go with an "offset" retainer and get the room you need.
Don't forget to subtract lash when looking at solid roller profiles. Most of the .630" lobes are around .026-.028 lash, which puts you down around .600" net lift.
What size (cc) are the ports on your heads? What cam(s) are you looking at?
What is your current installed height? You may be able to just go with an "offset" retainer and get the room you need.
Don't forget to subtract lash when looking at solid roller profiles. Most of the .630" lobes are around .026-.028 lash, which puts you down around .600" net lift.
What size (cc) are the ports on your heads? What cam(s) are you looking at?
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yes my installed height is 1.800. my heads flow to .700 lift but only gain about 4-5 cfm more after .600. the 195s finnished out at 210 after the porting and 66cc chambers. im not sure about what size solid roller yet. the car reminds me of a wind-up toy. goes like a bat for the first few hundred feet then just runs out of steam. ive only got 1200 rpm between the converter and valve float so im a little dissapointed. i guess i should have never rode in Johns car, spoiled me big time. so is the concensus pull the heads and redo the valves to be safe?
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Dave, 1.8 is plenty. Both Comp and Lunati have listings that will install at 1.8" with ~210 on the seat and 550-575 over the nose (with ~.620 net lift). Also, don't forget that most titanium retainers will net you an extra .050". Absolutely no need to change valves IMHO. Unless of course AFR uses cheapy valves that won't hang with the seat pressures and I would REALLY find that HARD to believe. I'm using a Lunati 1.50" spring installed at 1.80 and coil binds at 1.080". I have no issues with the .633 net lift cam I'm using. Also, don't be scared to put some spring on it! Too much is no problem, too little is trouble.
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Yes, a 917 Comp among others will work for your deal real well at 1.800 as long as you don't intend on running more than about .650 net lift.
I really prefer Isky's Tool Room Springs for most of the roller stuff I do & they start at about 1.900 & 230 or so lbs.
I agree completly with John about using lots of spring pressure on a roller. In my opinion the worst thing you can do to a roller is to run light springs on it.
Also, do not skimp on rollers. Isky's Red Zones & Crowers with the oiling option would be my first & second choice. The Isky's come with pin oiling standard.
And no,,, AFR does not use crappy valves
BTW, you will break a hell of a lot more valves with weak springs then stiff ones
I really prefer Isky's Tool Room Springs for most of the roller stuff I do & they start at about 1.900 & 230 or so lbs.
I agree completly with John about using lots of spring pressure on a roller. In my opinion the worst thing you can do to a roller is to run light springs on it.
Also, do not skimp on rollers. Isky's Red Zones & Crowers with the oiling option would be my first & second choice. The Isky's come with pin oiling standard.
And no,,, AFR does not use crappy valves
BTW, you will break a hell of a lot more valves with weak springs then stiff ones
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Jason, thats the plan. got the trailer ordered now. the track shuts down for x-mas and opens again in January sometime. finally got everything done on the car so im ready. no rollbar yet so will be limited to 1/8 mile. hope it at least turns some 7.50s first time out. the goal is 7.30 Dave
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pulled the build sheet on the engine today and looked at what the springs set up. im confedent only one set of valves were checked. intakes set up at 1.865 and exaust set up at 1.855. 1.530 dia. springs. set pressure is 160# closed intake and exuast 350#intake 380# exaust.
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