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Old 01-09-2006, 06:24 PM
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fod 390 and valve lift?

I have a 74 ford F-100 with a 390 FE so far I have a pair of headers, Edelbrock performer intake and a Holley 4 barrel carburetor. I want to install a comp cam 270S cam it has .540 of lift will I have any problems installing this like the retainer hitting the valve guide or any thing? How much lift can I have before I have to machine something?

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Old 01-10-2006, 03:48 PM
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no machining needed. if it were me, i'd go with comps' recommended valve springs, stockers aren't up to it.
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Old 01-11-2006, 06:41 AM
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yeah get the springs that come with the cam because those stock springs will break and drop a valve onto the piston and that won't sound too nice when that happens
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Old 01-12-2006, 01:04 AM
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The whole kit is $540 from comp cams I will call Summit and Jegs to see if its any cheaper any were ells but ya will do the whole kit for sure and I am thinking of switching to Holley projection at the same time I have wanted to try it for years.
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Old 01-12-2006, 01:26 AM
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If it were mine it would be mocked up and degreed to be sure of what I had.
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Old 01-12-2006, 08:44 PM
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Ya but I am not sure if I am going to pull the heads off or not I might just feed nylon rope in through the spark plug holes and turn the motor tell the cylinder is at TDC or as close as the string will allow it to get so I can install the valve springs and every thing ells with out taking the motor too far apart.
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Old 01-12-2006, 09:30 PM
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I think your pushing the limits with that cam. I would put a checking spring and for room at the piston too. It probaly will be fine, but it doesn't hurt to check.
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Old 01-13-2006, 09:35 PM
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I will ask comp cams what they think and if it is to big there is the hydraulic version that has the same advertised and duration @0.050 but only .512 of lift I will check for clearance at the valve spring but as far as the piston I think I am ok
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Old 01-14-2006, 02:00 PM
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Quote:
Originally Posted by 56Maynard
If it were mine it would be mocked up and degreed to be sure of what I had.

most definitely. i assumed that mock up and clearancing (sp) would be part of the total deal.
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