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Chapparal guy

04-11-2018 08:33 PM

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

hotshot537

04-12-2018 02:26 PM

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

Trash

04-12-2018 05:38 PM

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.

mira boater

04-12-2018 06:39 PM

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

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