|
Camzilla
I'm considering using the FMS Camzilla cam (Z303) when rebuilding my 5.0L. I understand that piston modifications are needed to provide the proper valve clearance. Does anyone have the dimensions needed for the modifications?
|
I think that cam might be a bad choice for a street car. With 290 degrees of duration and a .552 lift it's not going to produce much vacuum at idle and power brakes will be sluggish..if at all present.
What you need to do as far as flycutting your pistons is entirely up to what other components you have in your engine...heads, valve arrangement, deck height, cam timing....all affect valve to piston clearance. Until you figure out everything else you'll have you won't know... |
Thanks for the reply.
I had planned to use stock valves and heads. Also, I will not have power brakes so the vacuum should not be a problem. Any other hints? Thanks. |
I used a solid lifter cam with similar specs to those when I built my second engine. It was hard to get off the line because of the tall rear end (3.31) and first gear (2.21). It would not cruise at low RPM either, very jerky. I bought a Tremec transmission to get a lower first gear (3.27) and this helped off the line, but the power band of the engine was so narrow (5000 to 6500) that the wide spacing of the Tremec's gears would drop me out of the power band between each shift and it was still jerky. I had a choice to make. A close ratio six speed trans for $3,000 or a milder cam for $50 (used Edlebrock RPM hydralic) with Rhodes lifters. Guess which way I went?
Paul |
Always go with the cam one smaller than the one you think you need, you will be happier and faster.
|
but you won't be lopier :D :D :D
|
I have an extra Competition Cams roller cam for sale if you're interested. It's .530 lift with 1.7 rockers and .500 lift with 1.6
Duration is 285 intake 291 duration and the lobe centers have been set to give it some low end and good vacuum while still letting it have a nasty sounding idle..and trust me...it has a NASTY idle!. It pulls like all getout from 2500-7000+. It was a custom grind for me from Comp to fit what my Cobra needed. Let me know if you'd be interested...it's a proven grind ( to me anyway) and made 529 flywheel hp in my motor.:) |
The cam is the final piece in the motor's combo, determined by the rest of the components. With stock heads, unmodified, a big duration race cam will begin to make it's power after the rest of your motor is out of it's operating RPM. What works in a completely different combo will not work the same in yours. It took my four different cam grinds in my first hot rod to realize I had stock heads, low compression (9.5:1), and a short block that wouldn't routinely handle 7200 RPM without breaking; before I listened to my machinest and got "that tiny cam" he recomended and had a faster car that was more fun to drive. I learned the hard way, had I listened to my machinist....well I still might think bigger is better.
|
| All times are GMT -7. The time now is 09:11 AM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: