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Joined: Aug 2008
Posts: 106
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Joined: Aug 2008
Posts: 106 |
Hi, I am going to change my cam since I have a lot of the motor apart and need advice. I have a '75 400 with stock internals, stock 6x-4 heads, 600cfm carb, Ed Performer intake, and headers. Choice between Summit's 2801 or 2802. Thanks, Jason
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Joined: Jun 2003
Posts: 1,534
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Joined: Jun 2003
Posts: 1,534 |
2801 and don't forget to upgrade the valvesprings.
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Joined: Aug 2008
Posts: 106
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Joined: Aug 2008
Posts: 106 |
If I am changing the valve springs should I just upgrade to 1.6 roller rockers? Or is that just a waste of money given my setup?
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Joined: Jun 2003
Posts: 1,534
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Joined: Jun 2003
Posts: 1,534 |
A bit more lift without increasing duration would be good. There are several companies that offer 1.65 ratios.
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Joined: Jun 2003
Posts: 1,534
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Joined: Jun 2003
Posts: 1,534 |
Forgot an important consideration. Unless you are planning on removing the heads, stick with the stock lifter. Reason being, the pushrod holes need to be elongated for clearance on Pontiac engines. When it's time to get the heads refreshened, then do elongate the pushrod and switch to a higher ratio.
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Joined: Apr 2000
Posts: 7,408
Power Member
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Power Member
Joined: Apr 2000
Posts: 7,408 |
The 2801 has enough lift. The 1.65 rockers may be overkill. You are running a low compression motor.
If you were closer 9.5 CR would the benefits of 1.65 and elongation be worthwhile.
Si Vis Pacem Parabellum
1967 Starlight black PMD Engineering 400 Auto
1968 Alpine Blue 400 4 speed
1968 Verdoro Green 400 HO 4 speed
2013 1LE 2SS/RS Inferno Orange Camaro.
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Joined: Aug 2008
Posts: 106
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Joined: Aug 2008
Posts: 106 |
the pushrod holes need to be elongated for clearance on Pontiac engines. Doh!!! forgot all about that. Thanks for saving me money 
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