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Post by 69Rebel on Oct 4, 2022 8:32:16 GMT -8
So, I pulled the '74 heads off my '70 360 in preparation to put the '70 heads back on. This motor is fresh, and has run only long enough to break in the cam. The cam looks perfect through the holes in the block, but it has been sitting for a long time. Should I put a dab of cam break in lube on the foot of each lifter before I put it all back together and fire it up? The '70 heads have been completely redone with all new valves (SBC 11/32" 2.05/1.65), guides, seats, springs (Comp or Crane single with damper), retainers, etc. I don't even remember what I used for break in oil on this one.
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Post by spud on Oct 4, 2022 8:46:37 GMT -8
If its broke in its broke in. Just prelube the hell out of it with a drill and move forward. Your slipping into gaymc world.
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Post by 69Rebel on Oct 4, 2022 9:04:42 GMT -8
Yeah, I was slipping into gAyMC a little there. Just overthinking it because of the heavier springs in the new heads.
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Post by Captain Awesome on Oct 4, 2022 10:48:24 GMT -8
Put a 520 Slowpar in it. Cam condition doesn't matter. It'll run like a Pooch either way. lol
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Post by spud on Oct 4, 2022 13:15:11 GMT -8
I suggest you arm yourself with a valvespring tester. Remember too much spring wastes power and contributes to heat. Heavy springs generate heat. Heavy springs and mild cams are a bad idea. If your not revving high, you dont need them. Run enough spring, dont think more rate is safer. If you got a happy foot get a rev limiter. Spring pressure is tunable. If you have room you can increase your installed height with different locks or retainers. Heavy springs have a limited lifespan and will not last forever on the street. Heavies are stiff and will lose rate faster than light springs. Heavies are not a timing chains best friend . Chose your street gear conservatively.
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Post by 69Rebel on Oct 4, 2022 14:08:12 GMT -8
I don't think they are real heavy, but I know they are a little heavier than stock. The machinist knew these heads were going on a street car. I might pull one and have it measured.
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