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PostPosted: Tue Jul 28, 2020 10:54 am 
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EFI Slant 6

Joined: Fri Feb 15, 2008 8:17 am
Posts: 315
Location: edge of Wilkes county (Union Grove) NC
Car Model*: 1965 Dart 270 w/ 66 Valiant front clip
If I were to use a Mopar 528 cam and 340 spec springs, how much would I need to have trimmed from the top of the valve guides? (or suggested amount??)

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Michael Glass. Mopar stuff and some rusty Mopar stuff! 70 Challenger, 71 Demon, 65 Newport, 70 Charger. 76 Feather Duster, 41 Dodge pickup, 65 Dart.
youtube.com/user/DR440


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PostPosted: Tue Jul 28, 2020 11:44 am 
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Turbo Slant 6
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Joined: Tue Nov 23, 2004 6:05 pm
Posts: 813
Location: Desoto Texas
Car Model*: 1972 Dodge Colt
Someone might know a number, but you need to check your combination.
Most of the time, cutting for a better seal will get the clearance you need.
A seal like the teflon style, not the rubber style.

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PostPosted: Tue Jul 28, 2020 12:02 pm 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7594
Location: SW Washington
Car Model*: 1965 Plymouth Barracuda, 1954 Dodge C1-B8
.100" is my go-to for guide trimming, but you should install a valve and retainer to see what your gross clearance is now and subtract the height of the seal you'll use for the net clearance.

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Joshua


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PostPosted: Tue Jul 28, 2020 1:21 pm 
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 14533
Location: Blacksburg, VA
Car Model*:
Yes, measurement is best, but 0.125" is a good ballpark. Careful you do not coil bind those 340 springs too. Not sure they can take that lift number. Good to see you on the site!

Lou

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PostPosted: Tue Jul 28, 2020 2:21 pm 
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 12702
Location: Park Forest, Illinoisy
Car Model*: 68 Valiant
340 springs are right on the edge with that cam. As Lou said, make sure to check coil bind.

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PostPosted: Wed Jul 29, 2020 9:16 pm 
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EFI Slant 6

Joined: Fri Feb 15, 2008 8:17 am
Posts: 315
Location: edge of Wilkes county (Union Grove) NC
Car Model*: 1965 Dart 270 w/ 66 Valiant front clip
Thanks for the input! I'm going by what's on hand as far as valve springs go. I heard they need to be cut after the lift goes above .450...but I don't how much truth there is to that.

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Michael Glass. Mopar stuff and some rusty Mopar stuff! 70 Challenger, 71 Demon, 65 Newport, 70 Charger. 76 Feather Duster, 41 Dodge pickup, 65 Dart.
youtube.com/user/DR440


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