Valve springs

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Aug 2, 2025 | 06:18 PM

#11

Dave0176

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From: Brick NJ

Quote:

Originally Posted by Rains2much

I would do new lifters.

Yep definitely bought those. Picked up Hylift Johnson’s

Aug 3, 2025 | 09:39 PM

#12

Max Headflow

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From: poway

I'd go with a set of beehives or light springs with about 140 lbs seat pressure.. According to the 97/98 manual, stock evo springs are 110 to 130 lbs seated.

Aug 4, 2025 | 04:03 PM

#13

Dave0176

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From: Brick NJ

Quote:

Originally Posted by Max Headflow

I'd go with a set of beehives or light springs with about 140 lbs seat pressure.. According to the 97/98 manual, stock evo springs are 110 to 130 lbs seated.

Max how’s S&S 900-0593 kit says has 135 lbs seat pressure.

Aug 4, 2025 | 04:32 PM

#14

Max Headflow

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From: poway

Quote:

Originally Posted by Dave0176

Max how’s S&S 900-0593 kit says has 135 lbs seat pressure.

I'd use them.. The seat pressure might be a little higher as they say 1.850 spring height but that will simply boost the seat pressure a little..

Add:
Typical installed height is 1.800.

Last edited by Max Headflow; Aug 4, 2025 at 04:36 PM.

Aug 6, 2025 | 09:41 PM

#15

98hotrodfatboy

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Joined: Mar 2010

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From: Poolville

I would replace the springs with the Bee Hives.. This will open the door to many more cam options in the future (lift)...

Aug 7, 2025 | 02:38 PM

#16

Rains2much

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Joined: Sep 2022

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From: Florida

Quote:

Originally Posted by Max Headflow

I'd use them.. The seat pressure might be a little higher as they say 1.850 spring height but that will simply boost the seat pressure a little..

Add:
Typical installed height is 1.800.

hmmm I agree whole heartedly If you have the tenacity and willpower to go bigger and better in the future. However, with that said, when you’re building a small 80 inch to 88 inch motor with Low mechanical compression, there is a lot to be said for running a super light valve train and the absolute acceptable minimum seat pressure.

When you don’t have a lot of compression or cubes and you’re not gonna run a gigantic Cam, You can make a really fun to ride, zippy little motor by keeping the drivetrain, minimal and lightweight.

To illustrate, one of the most fun motors I ever built was stupid simple. It was a stock little 74 inch that I stroked to 84. We made the fly wheels on the light side and we ran cast 9 to 1 pistons. I had a super B on it and it was a “B” cam with really lightweight Shorty Sifton lifters and we cleaned up the rocker arms and ran the minimum seat pressure. It wasn’t a torque monster or anything, but man in that little FXE that thing just zipped all around town. It revved up so fast and ran so smooth, it was just super fun to ride. Easy to kick, easy on the clutch, really reliable.

Last edited by Rains2much; Aug 7, 2025 at 02:41 PM.