ah1988ford
Full Access Member
Just wondering if my valves are within specs the exaust ones are
54
59
51
57
My intakes are
53 1/2
53 1/2
53
57
54
59
51
57
My intakes are
53 1/2
53 1/2
53
57
Valve recession specs?
- Thread starter ah1988ford
- Start date
54 what? 54 thou? If you have too much recession you can hurt performance because you are sacrificing effective lift.
ah1988ford
Full Access Member
sorry, yes thousandths. Just got home from the shop looked in my book and they are over specs. So can I run them without damaging them?
Specs
intake..............................(.042 - .052)
exhaust...........................(.043 - .055)
.........................................................................................................................................................
On my heads
exhaust ones are
.054
.059
.051
.057
My intakes are
.053 1/2
.053 1/2
.053
.057
What are the installed heights of your springs? You’re not going to have piston valve contact but you should be within the spec, not over or under it.
ah1988ford
Full Access Member
from the bottom of the spring where it sits on that disk to the top of the spring where it meets the cap is 1 7/16. That is just the spring length without the cap and bearing disk and the spring is compressed.
What cam do you have?
ah1988ford
Full Access Member
as far as i know stock
DrCharles
Full Access Member
I'd be more concerned about valve guide wear and clearances...
ah1988ford
Full Access Member
I had the valve guides checked they are good, and it has new valves i put in. the only thing that has me worried is the valve recession. trying to do a quality rebuild so I don't have to pull the motor out a fourth time lol
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Leave your valve recession where it is it'll start and run just fine then if you ever want to put a cam in later on you'll have enough room to play with if you put it at minimum I guarantee you if you change camshaft it will touch their that close.
All the heads I do I try for 55 on the intakes and 60 on the exhaust I've never had an issue or a complaint.
All the heads I do I try for 55 on the intakes and 60 on the exhaust I've never had an issue or a complaint.
Last edited:
Keep in mind the milling of the decks on the block. You said in a different thread that your decks were milled 50 thousands. I had asked if that was really supposed to be 5 thousands but I don't know if you read my post.
So, were the decks machined 50 or 5 thousands? Cause 50 thousand on the decks is a lot of material. If that is really how much they took off the decks, your block is likely unusable.
Heath
So, were the decks machined 50 or 5 thousands? Cause 50 thousand on the decks is a lot of material. If that is really how much they took off the decks, your block is likely unusable.
Heath
ah1988ford
Full Access Member
yeah i forgot some zeros in my measurements, opps! i meant 0.005 he took off the deck, not 50 thousands! cause yeah that is a ton of material
Sidewinded_idi
Full Access Member
Did you take the same off the heads?
ah1988ford
Full Access Member
no nothing was taken off the heads
