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  #46 (permalink)  
Old 11-24-2012, 08:10 AM
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Limited info on the net about this cam so far... Hoping to get a couple more opinions before I go out and shell the 300 for this dang thing. 200$ hotcam sounds alot nicer haha. No i like the howards better.

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  #47 (permalink)  
Old 11-24-2012, 11:30 PM
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Anyone think different specs will do better for my combo?
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  #48 (permalink)  
Old 11-27-2012, 07:20 AM
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Okay myabe this cam will be better suited for my combo.

Cam Style:Hydraulic roller tappet

Basic Operating RPM Range:1,300-5,500

Intake Duration at 050 inch Lift:217

Exhaust Duration at 050 inch Lift:225

Duration at 050 inch Lift:217 int./225 exh.

Advertised Intake Duration:270

Advertised Exhaust Duration:278

Advertised Duration:270 int./278 exh.

Intake Valve Lift with Factory Rocker Arm Ratio:0.495 in.

Exhaust Valve Lift with Factory Rocker Arm Ratio:0.500 in.

Valve Lift with Factory Rocker Arm Ratio:0.495 int./0.500 exh.

Lobe Separation (degrees):110

Camshaft Gear Attachment:3-bolt

Computer-Controlled Compatible:No

Valve Springs Required:Yes

Camshaft Manufacturers Description:Good idle, street performance, strong lower to midrange. Stock converter OK.
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  #49 (permalink)  
Old 11-30-2012, 09:11 AM
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Now that cam selection is out of the way, Ive been looking at steel skip white full roller rockers. does anyone have experience with them? The price seems pretty low.. Im sure the "lifetime warranty" only covers if they break in half or something but still seems like a good deal.

My vortec heads have guide plates and screw in studs. I need to be looking at narrow body rockers right?

Im still looking for a couple more opinions
I was under the impression that I would need to change my valve springs

135 lbs. @ 1.750, 325 lbs @ 1.200 (1.250 diameter) sais good for .600 lift cam.


I can use my .500 lift cam with these springs? I assume they are for a roller cam as they are on vortecs?
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  #50 (permalink)  
Old 11-30-2012, 10:09 AM
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I would use what you already have. Why would you buy a different set of pistons for a little bit more compresson? Then you are going to have to get new pistons pressed onto the rods. You might not even notice the difference in the performance. You can buy a used roller cam on Ebay, they are reuseable. If you don't want what you already have sell it. It might not be easy to sell and then you will have to find something else.
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  #51 (permalink)  
Old 11-30-2012, 10:12 AM
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How much is all that going to cost? You will turn a $400 dollar short block into something that cost thousands.
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  #52 (permalink)  
Old 11-30-2012, 10:28 AM
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Quote:
Originally Posted by V8&4spd View Post
How much is all that going to cost? You will turn a $400 dollar short block into something that cost thousands.

Yes I am leaving the short block as it is. Except for the stock flat tappet cam.
Im sure there was A cheaper way of doing this but it is what it is. Im looking at 1600 for the long block. I need to buy Roller rockers next and am looking for anyone that has exp with skip whites steel rockers. Or is there some nice GM rockers I can use? My vortecs have guide plates installed.
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  #53 (permalink)  
Old 11-30-2012, 10:33 AM
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You could probably buy a used late model LS engine and buy the aftermarket intake for a 4 bbl carb on what you are trying to do to a $400 shortblock. That shortblock was not a bad deal as long as you don't end up spending a lot of money to make it work.
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  #54 (permalink)  
Old 11-30-2012, 10:51 AM
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Quote:
Originally Posted by V8&4spd View Post
You could probably buy a used late model LS engine and buy the aftermarket intake for a 4 bbl carb on what you are trying to do to a $400 shortblock. That shortblock was not a bad deal as long as you don't end up spending a lot of money to make it work.
I am not changing the shortblock just doing a cam swap. and yeah I could have went and got a 300$ used vortec and slapped a carb on if I wanted a used engine.
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  #55 (permalink)  
Old 11-30-2012, 10:56 AM
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Looking for help on the valve springs, Im not sure how close is "close enough" as far as specs go.

The recommended valve springs for the xr270hr ( I am getting the howards version) are

132 @ 1.750 293 @ 1.250

the springs on my vortecs are

135 lbs. @ 1.750, 325 lbs @ 1.200


Pretty close at 1.750, pretty large difference on the second spec..
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  #56 (permalink)  
Old 11-30-2012, 12:15 PM
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Don't go for the pitfall of close enough.To much pressure is going to wear the lifter/cam prematurely.The Howards is a quality cam and you should go back to Competition Products to get the matching springs.Just do it right.
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  #57 (permalink)  
Old 11-30-2012, 01:09 PM
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Originally Posted by 1Gary View Post
Don't go for the pitfall of close enough.To much pressure is going to wear the lifter/cam prematurely.The Howards is a quality cam and you should go back to Competition Products to get the matching springs.Just do it right.



lame.
Maybe I can sell these other spring they are new
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  #58 (permalink)  
Old 11-30-2012, 02:30 PM
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Quote:
Originally Posted by 0trbo4myCHEVUICK View Post
lame.
Maybe I can sell these other spring they are new

So if there are shims, i might beable to lower my spring pressure?
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  #59 (permalink)  
Old 11-30-2012, 04:35 PM
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Okay well actually comp suggests 2 different springs for this size cam. My springs are alot closer to the 2nd option.

option 1. 986-16 132 / 293
option 2. 987-16 121 / 343


current springs 135 / 325 -
almost the seat of the first and open of the 2nd...?



I think I will be okay... accounting for loss of pressure I would be even closer to the recommended spring after a year lol.
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  #60 (permalink)  
Old 12-02-2012, 10:59 AM
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I've been looking into isky roller cams in the same profile range as the XR270HR.

Im wondering if a cam has an operating range of 2000-6000 on a 112lsa, how much will the rpm range change going to a 110 or 108?

The lift/duration specs are VERY similar to the 270 but the 270 is on a 110 and starts 500rpm sooner.

I dont want a comp product and have heard very good things about isky from alot of my dads old school friends.
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