Valvetrain
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Elder User
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From: Slippery Rock, PA
Valvetrain
What should i use to upgrade my 300s valvetrain for performance? i plan for 600HP yes that sounds outrageous but oh well it will work. Which rockers,springs,valves etc. should i use?
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Joined: Sep 2003
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From: SE, Michigan
Originally Posted by broke77f100
What should i use to upgrade my 300s valvetrain for performance? i plan for 600HP yes that sounds outrageous but oh well it will work. Which rockers,springs,valves etc. should i use?
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Posting Guru
Joined: Jun 2002
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From: redding U.S.A.
For 600hp i'm assuming you're revving it up pretty high, so you want:
a good set of hardened pushrods
high pressure springs
roller rockers would be a good idea
the pushrods are 10+" on this beast so you want to make sure they don't flop over on you. high pressure springs will help prevent valve float, look to the cam specs for the required spring pressure.
Roller rockers reduce the stress in the valve train, which is good for upper rpm, and as long as you get a quality set they will reduce flex and possible damage.
valves? 600hp? Big ones.
a good set of hardened pushrods
high pressure springs
roller rockers would be a good idea
the pushrods are 10+" on this beast so you want to make sure they don't flop over on you. high pressure springs will help prevent valve float, look to the cam specs for the required spring pressure.
Roller rockers reduce the stress in the valve train, which is good for upper rpm, and as long as you get a quality set they will reduce flex and possible damage.
valves? 600hp? Big ones.
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Elder User
Joined: Mar 2006
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From: Slippery Rock, PA
Yes, I do plan on using this in my 77 F100. Good thing it has the 9" rear axle. Plans include a Clifford dual quad intake, camshaft, blueprinted cylinder head,bore it for .060 or .040 pistons(custom made for chevy rods), offset grind crank Clifford Header, upgrade the entire ignition system and plugs,port and polish of course,maybe a turbo or nitrous or both, and of course the rest of the valve train. I guess i haveta swap the 3 on the tree for a 4 on the floor
Posting Guru
Joined: Jun 2002
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From: redding U.S.A.
you are going to need some mighty fine headwork to compliment the longer stroke and big intake.
Even at mid-range rpm, a smoothed out stock head will probably wease out pretty bad.
Luckily, from what i hear, the 300 head has plenty of material to hog out, so as long as you can fit some big valves in there and get manifolds to match, you are all set.
Even at mid-range rpm, a smoothed out stock head will probably wease out pretty bad.
Luckily, from what i hear, the 300 head has plenty of material to hog out, so as long as you can fit some big valves in there and get manifolds to match, you are all set.
