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02-04-2012, 02:42 PM | #21 | |
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Re: Valve differences
Quote:
If I grind the seat 0.020" (verticaly) then the valve sits lower in the block. Since the horseshoe clip rests against the bottom of the deck guide bore, the guide is in the same position as it was before the seat was ground. As the valve sits lower by 0.020" the spring is lengthed by 0.020" also and thereby lowers valve seat pressure requiring shims. Jim
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02-04-2012, 06:03 PM | #22 | |
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Re: Valve differences
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Measure your spring pressure at the new installed height and as Old Ron says .020" won't make much of a change that can be determined with the average spring pressure tester (bin there done that)..Shims are sold in .015" .030" .060" only. What do you require for desired spring pressure and at what height?That is what you should be shooting for without a good way to measure spring pressure you are only guessing at best.After all the fun is over you will come to recognize that the small amounts of change have no real change in spring pressures at such low spring values. R |
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02-04-2012, 06:57 PM | #23 |
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Re: Valve differences
Your getting it down Jim. If you building a stock engine with stock springs and drop the seats .020 I'd install a .030 shim and call it good. Walt
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02-04-2012, 07:11 PM | #24 |
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Re: Valve differences
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02-05-2012, 12:37 AM | #25 |
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Re: Valve differences
What about using the rotators Walt,are they the go,ie, better using them, or not,
Lawrie |
02-05-2012, 10:40 AM | #26 |
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Re: Valve differences
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02-05-2012, 04:47 PM | #27 |
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Re: Valve differences
Thanks Ron, luckly the eng is still on the stand,so its easy to remove the other style and fit the rotators,as the straight stem valves are already in.
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02-05-2012, 06:58 PM | #28 |
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Re: Valve differences
Lawrie, check your installed spring pressure, accually the valve are a differance length between the rotor setup and the single retainer. I have the rotor setup in my 40 - 276, track cam, around 9.5 heads, 4 carbs, T-5, 9in. 3:50 gears. built it 35 yr's ago, over 100 grand on speedo. Walt
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02-06-2012, 11:42 PM | #29 |
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Re: Valve differences
Walt ,you are on the ball,as after I said I would look at changing them out,I thought about seat pressure too,
Darn, there goes another couple of days work. Lawrie |
02-07-2012, 02:31 PM | #30 |
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Re: Valve differences
I think if you use the short springs and a single .060" spacer you'll be OK
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02-07-2012, 03:00 PM | #31 | |
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Re: Valve differences
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No. I have a '53 block that definately doesn't have hardened seats. Or did you mean earlier than *BA series of motors? |
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02-08-2012, 11:19 AM | #32 | |
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Re: Valve differences
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Jim
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02-08-2012, 01:19 PM | #33 |
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Re: Valve differences
1.89 it is.
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02-08-2012, 07:59 PM | #34 |
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Re: Valve differences
While on the subject of valves I need a favor. Original Ford valves had a "bump" around the stem under the valve head. This was actually a bump and not an undercut. I have a mushroom type valve with a bump and a '51-'53 valve with the bump. I'm looking for someone on here that may have a '49-'50 valve with a bump I could purchase. Only need one for a project I'm working on. I tried several vendors but no luck.
TIA Jim
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02-08-2012, 08:26 PM | #35 |
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Re: Valve differences
I should have a few of them. 49-early51?? I'll check tomorrow.
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02-08-2012, 08:37 PM | #36 |
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Re: Valve differences
I've probably have bushel of useable one if you don't get one . Walt
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02-09-2012, 05:58 AM | #37 |
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Re: Valve differences
Thanks Ron PM me if you do and I'll PM my address back to you.
Jim
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02-09-2012, 06:00 AM | #38 |
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Re: Valve differences
Thanks Ron PM me if you do and I'll PM my address back to you.
Jim Walt thanks for the offer if Ron doesn't have one I'll PM you Jim
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02-09-2012, 10:35 AM | #39 |
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Re: Valve differences
Yes, Thank you for the information. I have a 50 flattie and wasn't aware of this difference.
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