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#1
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I am looking for a new cam for the following setup:
1974 TA 467cid 10.25:1 RPM man. 1.5:1 rockers 4-spd (stock org.) Hooker Super Comp headers 750cfm Q-jet (stock, stuck with it for now, will upgrade to Cliff's 850) 2.73 rear gears 26" Tire dia. Current cam: @0.050 228/235, 0.479.0.494 (w/1.5) hyd. flat tappet, worked well with the above set up I just had an issue with my current cam (bad lifter) and I'm a bit worried about the trend with the flat tappet lifters and cams having problems and I think I want to go with a roller (hyd. or solid) that will give me similar spec's to the above cam. If anyone feels like they have a "sure thing" in a solid lifter flat tappet cam I might do that too. I drive the car hard on twisty back roads with nice long straights mixed in. Thanks,
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Uneasyrider “To find yourself, think for yourself.” ― Socrates “The unexamined life is not worth living.” ― Socrates “Wise men speak because they have something to say; fools because they have to say something.” ― Plato |
#2
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use oil with acceptable zinc content, i.e Valvoline racing or Rotella-T and you won't be plagued with flat tappet problems.
With that gearset, a cam recommendation is going to be tricky. However, you do run a 4speed so that will help. If the current cam ran well, why not stay with it? "Lloyd-Tx" runs a small solid in his '72 Formula and really likes it. Maybe he will chime in with suggestions.
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Home of WFO Hyperformance Shaker induction. Last edited by Larry Navarro; 11-14-2006 at 06:59 PM. |
#3
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That short tire turns that 2.73 into more like a stock tired 3.08.
I agree with Larry in that using the correct oil or using additive should alleviate all concerns about flat tappet failures. For road racing a big inch motor like yours I would tend to want to kill a little of the bottom end so you can control exit acceleration easily which would lead me to a little bigger cam and install it retarded 2-4 degrees. I run a Comp roller that is 236/242 @.050 with .520/.540 lift and it is installed straight up on 106 centerline. It has a lot of low end even with factory headers and would be a handful to control out of corners. As with all cam inquiries, there are only about 1 million variables.
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Bob Woodard Brighton, MI 2012 SRT8 Charger - 12.70 @ 111mph |
#4
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Thanks for the input guys. I realize it's all opinion on the cam but I appreciate the input. It gives me a place to start at the least.
![]() The whole story is that I had a problem with the cam/lifters from the start. I had a lifter that would never come in. We could never get it to adjust so I was going to have to pull the thing apart and fix that when I burnt the low end out of it. I was using the stock pan and windage tray and the oil control was poor at best. That modern rubber made a good handleing car much better. It had had problems with oil starvation in corners when it was "stock" but now with more power and better rubber it's compounded. On top of that, the way we had to route the dip stick tube through the headers was giving me fits trying to get a good oil reading on the dipstick. It tended to leave "drip" of oil on the stick above the full mark all the time and made it hard to read. So to make a long story short ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
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Uneasyrider “To find yourself, think for yourself.” ― Socrates “The unexamined life is not worth living.” ― Socrates “Wise men speak because they have something to say; fools because they have to say something.” ― Plato Last edited by uneasyrider; 11-15-2006 at 01:03 PM. |
#5
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I found this Crane 289621 hyd. roller cam that seems to be in the same range as the old flat tappet:
@0.050 222 Int. 230 Ext. Lift w/1.5 rockers 0.509 Int. 0.528 Ext. lobe sep. 112 What do you guys think? Thanks,
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Uneasyrider “To find yourself, think for yourself.” ― Socrates “The unexamined life is not worth living.” ― Socrates “Wise men speak because they have something to say; fools because they have to say something.” ― Plato |
#6
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Looks like a cam that would make a lot of low end torque in a 467 CI engine. I would install it a couple degrees retarded to kill a little of the bottom end.
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Bob Woodard Brighton, MI 2012 SRT8 Charger - 12.70 @ 111mph |
#7
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Thx for the advise SD. Yep, the low end torque with the old cam gave me a couple of eye openers coming out of a corner or two:
Tooling along ![]() ![]() ![]() ![]() ![]() ![]()
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Uneasyrider “To find yourself, think for yourself.” ― Socrates “The unexamined life is not worth living.” ― Socrates “Wise men speak because they have something to say; fools because they have to say something.” ― Plato |
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