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post #1 of 5 (permalink) Old 09-21-2019, 11:08 AM Thread Starter
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Spring pressure

Not sure what stock spring pressure is on D3 heads but do you see any issue using the stock lifters with the increased spring pressure from a set of edelbrock 60669's? Seat pressure on them are 120 not sure on open pressure. Cam is .530/.530 lift.
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post #2 of 5 (permalink) Old 09-21-2019, 11:57 AM
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Not sure what stock spring pressure is on D3 heads but do you see any issue using the stock lifters with the increased spring pressure from a set of edelbrock 60669's? Seat pressure on them are 120 not sure on open pressure. Cam is .530/.530 lift.
New stock lifters on the new cam???



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post #3 of 5 (permalink) Old 09-21-2019, 12:59 PM Thread Starter
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No not at this point just the new heads and new 3/8 push rods.
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post #4 of 5 (permalink) Old 09-21-2019, 06:37 PM
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No not at this point just the new heads and new 3/8 push rods.

The OEM cam and lifters will easily handle the eddy spring package.

I would closely check the original lifters and cam lobes for abnormal wear brought about by the lack of ZDDP in modern oils.

With oem pistons you can not get too aggressive with cam timing without enlarging the oem valve notches for radial clearance.



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Scotty J. "AKA" The "Mad Porter"
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post #5 of 5 (permalink) Old 09-21-2019, 09:36 PM Thread Starter
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The cam / lifters are aftermarket (no name ) .530 lift and I believe duration is 218 @ .050. Pistons are trw 12cc domes. Figured the increase pressure would be ok but wanted to get a second opinion.

Good point on the zinc
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