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Xm270hr cam questions

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Xm270hr cam questions


Old 04-11-2018, 09:33 PM
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Join Date: Apr 2018
Posts: 1
Default Xm270hr cam questions

I am going to start building a 358 with vortec heads and i wanna use the comp xm270hr cam. I have stock manifolds with 3 inch plates and stock risers .and side exit throuh hull thats 4 inch all the way. Has anyone had any reversion problems with this cam . I belive the 3 inch riser plates will help immensely to prevent it . Comp says i shouldn't have an issue . Looking for input
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Old 04-12-2018, 03:26 PM
Join Date: Apr 2012
My Boat: Advantage 21sr br
Posts: 28

I run a x4270hr in my 350mag no problems!

The xm270hr has to much lift for a stock Vortec head
shock vortec head has a .474 max lift Otherwise you’ll hit your valves Seat

Last edited by hotshot537; 04-12-2018 at 03:34 PM.
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Old 04-12-2018, 06:38 PM
Join Date: Jun 2011
Posts: 984

I run a Crower roller cam that's a bit bigger with no issues. If using Vortec heads have them set up for lift clearance as mentioned above.
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Old 04-12-2018, 07:39 PM
Join Date: Mar 2013
Location: nova scotia
My Boat: 1992 baja 204
Posts: 38

i run xm270hr with no issues mercruiser manifolds and risers thru hulls i used valve springs from Alex's parts
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