Another cam question-351m
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From: Southern NM
Stock intake valve springs go into coil bind@0.490,and exhaust valve springs using a rotator retainer go into coil bind@0.480.You would be time and money ahead to replace the springs now.If you go on Comp Cams website and roll up the specs for that cam,it will tell you that you cannot use the stock springs and retainers.If that is the grind you want,they make a complete kit including the valve springs.
Last edited by maskedman; May 14, 2010 at 12:04 AM. Reason: added information
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The factory springs are rated at what,like 225lbs at 1.4in or 1.2in and exert 80 lbs spring pressure when not open,should I just try to match up and aftermarket spring with similar specs or go with more pressure?Are there different types of retainers? 
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Senior User
Joined: Feb 2009
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From: Southern NM
Look into the complete kit for that grind.Comp Cams shows eveything from basic(camshaft only),to a full set with timing set,lifters,springs,retainers,etc.That way you can match components.Have a look at this P/N K32-218-3.
Last edited by maskedman; May 14, 2010 at 01:14 PM. Reason: added part number for kit.
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I would have liked to buy the whole kit but am on a tight budget that wouldn't allow it.The summit techs said I need a spring that has 230lbs opening and 110lbs seat pressure(I think stock is 225lb/80lbs pressure) for this cam.
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cam question
COMP Cams - Cam Details
I wouldn't hesitate to run this size cam on stock springs. One upgrade that I would recommend would be hardened push rods. Remember, stock, and even remaned heads usually have triple/quad grooved valves and do not like to go over 5500 RPM cause they have a tendency to break off below this weak point.
Another point to share is that you can put a 4v intake and carb and nice cam on these motors, but that air has to get out too. Ran a 214 0.524 single pattern Crane once and had a sever hesitation that wouldn't tune out till I installed a set of headers, and that moment I was sold on these 'boat anchors'. BTW my first truck was a 77 F150 w 460/C6/headers, and haven't wanted a 429/460 since my second set of headers.
Hope this helps.
I wouldn't hesitate to run this size cam on stock springs. One upgrade that I would recommend would be hardened push rods. Remember, stock, and even remaned heads usually have triple/quad grooved valves and do not like to go over 5500 RPM cause they have a tendency to break off below this weak point.
Another point to share is that you can put a 4v intake and carb and nice cam on these motors, but that air has to get out too. Ran a 214 0.524 single pattern Crane once and had a sever hesitation that wouldn't tune out till I installed a set of headers, and that moment I was sold on these 'boat anchors'. BTW my first truck was a 77 F150 w 460/C6/headers, and haven't wanted a 429/460 since my second set of headers.
Hope this helps.
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From: chicago burbs
the 252H is a relatively 'small' cam, but may be opening and closing the valves faster than the stock cam ever dreamed of. those tired old metalic lasagna noodles may not be up to another camshaft lifetime, especially at a brisker pace. the price of a set of decent springs is much less than fixing what happens when one breaks.
unfortunately, like i mentioned, it's not just the springs you need to watch out for. with these engines it's the retainer & spring package
and yeah, the 1975 and up D5 head casting has a terrible exhaust port. the 252H shouldn't notice though
unfortunately, like i mentioned, it's not just the springs you need to watch out for. with these engines it's the retainer & spring package
and yeah, the 1975 and up D5 head casting has a terrible exhaust port. the 252H shouldn't notice though
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