f13 piston to valve - confused here

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Oct 4, 2006 | 12:47 PM

frijolee

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f13 piston to valve - confused here

I checked my piston to valve clearance with my Futral F13 114lsa cam last night (checker springs and feeler gauges). I was a bit surprised to see I had only 0.065 on intake and a more than needed 0.130 on exhaust. My first thought was that I had the timing a tooth off but I checked that about a dozen times and conviced myself it's right.

After a bit of research it looks like I SHOULD be seeing 0.080 and 0.110 which would be perfect. Reference:
https://ls1tech.com/forums/generation-iii-internal-engine/452790-ptv-clearance-experts.html

I'm running ported lq9 heads, not decked that I know of.

I know the stock F13/F14 cams are supposed to have 4 degrees of advance ground in but I assumed that was included in the 0.080 and 0.110 above. What the hell's going on?!?

Oct 4, 2006 | 12:59 PM

PREDATOR-Z

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From: BFE

Bigger valves?

Oct 4, 2006 | 01:00 PM

Xtnct00WS6

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I'm just curious how you came to ur numbers using feeler gauges?

This is the way I was instructed to check PTV clearance:
https://ls1tech.com/forums/generation-iii-internal-engine/515456-ptv-measurement.html

Oct 4, 2006 | 01:44 PM

frijolee

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Quote:

Originally Posted by PREDATOR-Z

Bigger valves?

1.60 and 2.02. That might be something but it doesn't explain why exhaust is more than expected. I even checked two cylinders just to be sure.

Quote:

Originally Posted by Xtnct00WS6

I'm just curious how you came to ur numbers using feeler gauges?

This is the way I was instructed to check PTV clearance:
https://ls1tech.com/forums/showthread.php?t=515456

Same here, except the only difference was that I used a stack of feeler gauges to measure between the end of the valve and tip of the stock (though rebuilt) rocker. Then I measured the stack with a set of calipers.

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