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Topic Review (Newest First)
08-09-2012 08:08 PM
prostcelica F Bird can you please define a poser camlol.
What can would you recomend??
08-09-2012 07:34 PM
F-BIRD'88 The cam you are looking at is a cruiser/poser cam/ "power tour"
You are leaving a lot on the table. Forget the 1.6 rockers.
08-09-2012 07:29 PM
cdminter59
Cam Selection

You said this is a street car so I agree with you. Go with the XR274R solid roller. If you want to go up a step you could go with the XR280R. It requires 10.1 compression, 3000 torque converter, and 3.90 gears. Check out these kits. COMP Cams: Magnum, 280AR: Cam & Kit and this : COMP Cams: Xtreme Energy™, XR274R: Cam & Kit. One more thing, when selecting a camshaft you can go up or down a 1/2 point on compression ratio without causing any problems.
08-09-2012 07:28 PM
F-BIRD'88 Phone comp cams back again and this time tell them only that you want to go fast.
Don;t tell them you only go to the track once a years, or 99% street to what ever you told them.
Don't ask about VTP clearance etc.

Do not dummy down the conversation with your unfounded fears and
BS or you will get the wrong cam.
(they are there to sell cams. you can by the cam you want or buy the cam that the motor/car wants.
They will sell you what ever you tell them to.

Buy the cam that will make you go fast not the one that fits your idea
or limiting parameters.


Tell them what you got and tell them you want to go fast.
"Sell me the most powerfull street roller cam you got".

You will get a whole different answer.
08-09-2012 06:45 PM
ap72
Quote:
Originally Posted by vinniekq2 View Post
first,changing rockers will change the lift and also it will change the duration slightly. How are you choosing your cam? what are the flow numbers for your cylinder heads?What rpm range are you thinking?
That duration is about right. Rocker ratio doesn't affect duration. It does increase lift.
08-09-2012 06:16 PM
prostcelica This is the cam comp recomended COMP Cams: Xtreme Energy™, XR274R <BR> Great for Power Touring, Very Reliable Power, Rough Idle

These are the flow numbers for the heads out of the box but Im going to port them (after reading vizards book and researching the heck out of it) Edelbrock.com - Cylinder Heads - Chevy - Small Block - E-Street

As far as RPM range I dont plan spinnig it over 6000-6500
08-09-2012 03:03 PM
vinniekq2 first,changing rockers will change the lift and also it will change the duration slightly. How are you choosing your cam? what are the flow numbers for your cylinder heads?What rpm range are you thinking?
08-09-2012 02:52 PM
prostcelica Correct me if I'm wrong but if I buy a bigger cam that means more duration. I'm only 10.3:1. The XE274 is 236 @ .5. Which is right about where I want to be for my compression ratio isnt it??. By going to a 1.6 rockere you get a little more lift at the sane duration.
08-09-2012 01:03 PM
vinniekq2 buy a bigger cam?
08-09-2012 12:51 PM
prostcelica More lift. Why?? Bad idea??
08-09-2012 12:18 PM
vinniekq2 why do you want 1.6 rockers?
08-09-2012 12:11 PM
prostcelica Thank you very much F bird that is great info. Solid roller it is. In your opinion do I need to be concerned about PTV clearance with the comp XE274 solid roller?? Id post the link for the cam but I'm on my phone. Sorry bout that. I will chech clearances regardless but I thought I remember you saying in a previous post you didn't think I'd have an issue. Cam specs are INT - 236@.50 .55 lift and EX - 247@50 .57 lift. I am going of memory on the specs but should be close. I'd also like to run 1.6 rockers.......what do you think??
08-09-2012 07:31 AM
vinniekq2 thamk's f-bird'88 thats very well written and easy to understand.Wish I could explain things that clearly
08-09-2012 12:10 AM
F-BIRD'88 ALL the trick hyd lifters High bleed, Rhoads, racing hyd etc make much much more valvetrain noise at idle than
these mechanical street rollers ever will.
08-08-2012 11:59 PM
F-BIRD'88 The solid rollers always make more power.
1. the cam lobe provides more valvelift "area under the curve"
(the valve is open further, for longer)
2. Hyd roller lifters are heavy and tend to go into valve float/bounce at a lower rpm.
The hyd lifter is intolerant of any valvetrain separation. (lifter pump up)
The hyd lifter is intolerant of any oil foaming or momentary loss of oil pressure at the lifter or the agressive spring pressures
suitable to control a agressive cam profile.
(lifter collapse)

You will find these street mechanical rollers hold the lash for a long long time.
You will find that if you cold lash at .004" to .006" tighter than the cam card hot lash spec
that the valvetrain is near noiseless and the running valve lash "hot lash" is correct when the motor is at running temp.
And setting the lash is much less painfull and faster.

use the springs comp recomends and set the installed spring height to spec.

Easy routine maintenance, superior performance and rpm . Often less actual valve train noise than a fast action hyd roller.
Unless you are absolutly allergic to removing the valve covers 1 or manybe 2 times a year,
you will really like one of these cool solid street roller cams.

All the real fast guys that run hyd roller cams and lifters (for street duty) cheat and swap in solid roller lifters when they actually race for money.
They lash at .001 to .006" and only run it like that for limited racing.
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