Measure valve clearance with head off?

[loner]

My clearances are small but I've measured them with the heads off

and I'm wondering if the clearances will increase when the head in

torqued down to the block?

I have only measured one side so far, but I've got .005" to .006"

for the intake and .007" to .008" for the exhaust. Standard is supposedly

.008" for the intake and .010" for the exhaust. I read somewhere the

clearances could be reduced by by .001 to .0015 for an aluminium block

and head... also that smaller clearances was a trick to have bigger looking

cams.

Thoughts?

[Joker]

is that to the flat plane of the head? I'm just trying to imagine what your measuring without having a picture for reference (learning & freee bump at same time)

[lachlan]

Putting a feeler gauge Between the cam shaft and the lifter/shim . Not piston to valve etc.

Also technically having the can open 2 thou earlier and higher isnot going to make a noticable effect on power

Edited November 18, 2015 by lachlan

[Joker]

ahh yep see I confused myself with that & clearane with the piston head etc (thought might have been more exciting playing with plastercene etc

[Optical]

 loner said:

My clearances are small but I've measured them with the heads off

and I'm wondering if the clearances will increase when the head in

torqued down to the block?

I have only measured one side so far, but I've got .005" to .006"

for the intake and .007" to .008" for the exhaust. Standard is supposedly

.008" for the intake and .010" for the exhaust. I read somewhere the

clearances could be reduced by by .001 to .0015 for an aluminium block

and head... also that smaller clearances was a trick to have bigger looking

cams.

Thoughts?

Mine changed a little when i torqued down my last head, the deck isnt perfectly flat (but still in spec) anymore though which may have contributed. Depending on what buckets you have it's not too big a deal to sort out clearances once the heads are torqued up

[loner]

shimless buckets which are $105 + gst each

I'm hoping the clearances open up a bit when the head is torqued, otherwise I might just cross my fingers and hope that smaller clearances was a design decision by PBMS.

I only opened the motor up to fix an oil consumption problem which I believe was due to bad valve stem seals... and compression was really good, so I don't think the

clearances were causing any problems.