351 windsor build
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Elder User
Joined: Jan 2014
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From: smock pa
So there the same except for the head bolt holes right? Also I read somewhere earlier today that if I got gt40 heads I could put the 351 head valve springs on the gt40 heads.. guess there supposed to be stronger with a bigger cam?
Fleet Owner
Joined: Oct 2005
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From: Kentucky
The valve spring specifications are based on which cam you want to use, not engine size. I am not aware the Lightnings used different springs versus the Explorer. But I am not expert on the small nuances between those engines. Even if there were I would highly suggest using springs recommended by the camshaft manufacturer.
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Elder User
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From: smock pa
The valve spring specifications are based on which cam you want to use, not engine size. I am not aware the Lightnings used different springs versus the Explorer. But I am not expert on the small nuances between those engines. Even if there were I would highly suggest using springs recommended by the camshaft manufacturer.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
The springs in stock heads will handle more lift but they are just barely adequate for the stock cam so you definitely should use new/heavier springs for an aftermarket cam. I'd suggest the CL35-235-3 or CL35-239-3, a 351 with GT40 heads will make peak HP somewhere around 4500-5000rpm so there is no need to rev it any higher.
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From: smock pa
The springs in stock heads will handle more lift but they are just barely adequate for the stock cam so you definitely should use new/heavier springs for an aftermarket cam. I'd suggest the CL35-235-3 or CL35-239-3, a 351 with GT40 heads will make peak HP somewhere around 4500-5000rpm so there is no need to rev it any higher.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
I don't see how since these parts have absolutely nothing to do with the cylinder heads. Where are you reading that?
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Elder User
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From: smock pa
Comp cams website under the 262H under the cam install thing... here's the link http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=884&sb=2
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Elder User
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From: smock pa
O..so I can buy that cam and just put it in and it will work with no machining and no new springs?
New User
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If you want it to last you need to upgrade the springs. Those springs require some minor machining of the spring seats.
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From: smock pa
Can I do this myself or do I have to take it to a machine shop?
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From: smock pa
Ok... now would you do all this for this cam or just go with the smaller one and not have to do any machining?
