chev 305 dish piston eng.

leon philpot · 01-20-2021, 06:36 PM

need to find out what valve spring seat pressure should be.
checking mine with moroso guage was 220 was thinking they should be 180.
.357 / 390 lift. any help anybody.
thanks

Bill Bogues · 01-20-2021, 07:21 PM

Leon, unless you're running coated lifters and a billet camshaft I wouldn't go over 180 on seat. I've never been able to run 200 on seat without wiping out lobes, and Ive tried all the usual lifter combinations ( hole in bottom of lifters different oils and lubes)etc etc. The tool steel lifters with a nitrided cam is what I use at 180 / 360.hope this helps.

pmrphil · 01-20-2021, 07:25 PM

I would strongly recommend removing a spring, verifying the installed height, and then getting it checked with a Rimac (or similar) spring tester. The Moroso unit will vary depending on rockers, among other things. It's best used to check to see that all springs are equal.

REGGIE WINKLES · 01-22-2021, 01:00 PM

190 on the seat with Smith lifters. (I use the same 305 engine combo). No problems, just check them lifter pucks regularly.

01-20-2021, 06:36 PM	#1
leon philpot Junior Member Join Date: Jul 2002 Location: dallas Posts: 52 Likes: 203 Liked 2 Times in 2 Posts	chev 305 dish piston eng. need to find out what valve spring seat pressure should be. checking mine with moroso guage was 220 was thinking they should be 180. .357 / 390 lift. any help anybody. thanks

01-20-2021, 07:21 PM	#2
Bill Bogues Member Join Date: Apr 2005 Location: Bethany La. Posts: 323 Likes: 96 Liked 169 Times in 53 Posts	Re: chev 305 dish piston eng. Leon, unless you're running coated lifters and a billet camshaft I wouldn't go over 180 on seat. I've never been able to run 200 on seat without wiping out lobes, and Ive tried all the usual lifter combinations ( hole in bottom of lifters different oils and lubes)etc etc. The tool steel lifters with a nitrided cam is what I use at 180 / 360.hope this helps. __________________ Bill Bogues 4696 STK

01-20-2021, 07:25 PM	#3
pmrphil Member Join Date: Aug 2010 Location: CT Posts: 456 Likes: 1,794 Liked 346 Times in 150 Posts	Re: chev 305 dish piston eng. I would strongly recommend removing a spring, verifying the installed height, and then getting it checked with a Rimac (or similar) spring tester. The Moroso unit will vary depending on rockers, among other things. It's best used to check to see that all springs are equal. __________________ Phil Molski PMR Performance S/C 1623

01-22-2021, 01:00 PM	#4
REGGIE WINKLES Member Join Date: Jun 2007 Location: St. Augustine, Fla. Posts: 229 Likes: 568 Liked 39 Times in 9 Posts	Re: chev 305 dish piston eng. 190 on the seat with Smith lifters. (I use the same 305 engine combo). No problems, just check them lifter pucks regularly. __________________ Reggie Winkles 2650/Stock

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