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Feb 18, 2023 | 02:38 PM

#11

johnjzjz

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From: la la land jerzey

The pan and the shovel use the exact part number in an exhaust valve

Feb 18, 2023 | 02:48 PM

#12

pgreer

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Joined: Aug 2020

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From: College Station, TX

Panhead rocker arms are a different ratio than Shovels, so that should be considered. And, the bronze valve seats in Pan heads weren't the best idea either. But you gotta love a Panhead.

Paul

Feb 18, 2023 | 03:07 PM

#13

johnjzjz

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From: la la land jerzey

We have in an original occasional use pan used over sized intake and or exhaust valves so we bring the stem heights back so the rocker arm is not pushing the valve side ways instead of up and down being deep sunk into the heads - then massaging the bowl to improve the flow just a bit no massive hogging a finesse is all

pan rocker ratio is 1.5 — shovel rocker ration is 1.43 - this nets you a 450 cam in a shovel becomes a 470 cam in a pan and maybe 1 or 2 degrees of duration both intake and exhaust - while the pan benefits from the .020 extra lift and. A frizzle of duration - nothing i have ever seen caused an issue i have 5 pan engines and 4 shovels i am doing in the shop — bags of valves from everyone it seems today you need as everything is off and no one is making the same diameters and or sizing so

Feb 21, 2023 | 11:45 AM

#14

Rains2much

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From: Florida

Quote:

Originally Posted by johnjzjz

I know what you’ve shared is dead right from every parts catalog or Harley spec.. but just curious if you’ve personally measured very many shovel rockers? Almost all I’ve measured are much much closer to 1.5 if not dead on at 1.5. I degree a lot of shovel cams.. went down the money and time waist of baisley.. I think you’ll find somewhere around the 70 cone the shovel rockers became 1.5 even if it’s not in print.

I’m pretty old school hobbyist.. I clay, mock up, CC assembled chambers only.. I never take printed measurements as gospel. But that’s been my observation. I got into it with redshift once for welding their cam gears because they were not perfect.. it also led me to the 1.5 rockers. Outta maybe 20 sets all I had but maybe 2-3 pairs were 1.5 and not 1.43.

Last edited by Rains2much; Feb 21, 2023 at 11:51 AM.

Feb 21, 2023 | 03:06 PM

#15

johnjzjz

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From: la la land jerzey

We set travel taller then needed ( distance between the bottom of the top retainer keys installed after the valve job - to the top of the seal installed < travel distance and any production mistakes are covered ) as you know not every body does the job they were given - having said that its valve spring pressure also i have a 1000 pound rimac machine it shows us open and closed pressures using a dial gage and the camshaft lift - after we use the lathe to check the lobe lift to insure we are setting to the actual cams lift - the yahoo cams by some guy who thinks he know something - are never what the cam card sayes if you get one what it has printed on it

we had a tool for race motors to correct the rocker ratio most times we do a spot grind to correct — the reason 1.625 evo rocker - with 1.675 = an easy .020 in lift

Danny at zippers - problem is he grew past his ability to check everything leaving his business - and again you can hire help that tells a great story

Feb 28, 2023 | 09:29 PM

#16

OLD 96

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From: WACO

This all gone over my head. I took my 1964 Pan top end to a shop in Houston for a rebuild. In 1975. I was young and dumb. But. The shop owner was not. He talked me into traded me out of my pristine Panheads for a set of shovel heads. He knew what he was doing. All I remember was his name was Lonnie. He went on to build one of the largest bike shops in Houston. Due to his unscrupulous character. I will always remember that. And. He can burn in Hell. I hope that this has not gone off track from what the OP started with.

Last edited by OLD 96; Feb 28, 2023 at 09:45 PM.

Mar 6, 2023 | 02:14 PM

#17

Rains2much

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From: Florida

Quote:

Originally Posted by OLD 96

Not to take sides but in 1975 he might not of thought he was taking advantage of you. Shovel heads do out perform pans and he may have thought you’d like the power. In 75 pan heads were nowhere near as rare as they are today. It would be like going to the bike shop with an evo and a guy suggesting you bolt on new after market heads that make more power and taking your stock ones in on trade.