Do I need to change lifters?
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Joined: Aug 2002
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From: Toronto, Ont
Do I need to change lifters?
I'm building a mild 305 and am using an LT1 cam with 1.6 pro magnum rockers. The specs are like .477/.489. Do I need to change the lifters or no? My stock valve springs good? These 081 heads we're on a 350 before this and are ported/bowl work.
Joined: Sep 2005
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Car: Yes
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Transmission: Sometimes
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Put new springs on it. You're just ASKING for trouble, leaving the stock garbage on there.
The lifters will be fine though.
The lifters will be fine though.
Joined: Sep 2005
Posts: 27,933
Likes: 2,454
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
That's not a real radical cam or anything, even with the higher ratio rockers, so springs shouldn't be too hard to nail down.
Any of the major cam mfrs entry-level springs (Comp, Lunati, Crane, Isky, Crower; not GM, not K-Motion) would do well. Comp 981 for example. Those will fit in the stock spring pockets, as will the basic 1.25" OD products from the other mfrs. Get the matching retainers and keepers, and an assortment of shims.
Check the installed height. You'll want to aim for the "spec" height of around 1.70".
Any of the major cam mfrs entry-level springs (Comp, Lunati, Crane, Isky, Crower; not GM, not K-Motion) would do well. Comp 981 for example. Those will fit in the stock spring pockets, as will the basic 1.25" OD products from the other mfrs. Get the matching retainers and keepers, and an assortment of shims.
Check the installed height. You'll want to aim for the "spec" height of around 1.70".
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