[DeTomaso] More valvetrain for 6143

[Julian Kift]

Dave,

 

What level of build is the engine and how many miles on it? IMO if you are comfortable that the valve is straight and everything else is okay (lifters, springs etc.) then you can probably polish up the end of the exhaust valve stem (adjustment wil be taken up by the roller rocker preload), replace the bad roller rockers and be done.

 

Julian
 
> Date: Tue, 19 Jan 2010 23:00:26 -0800
> From: davel at emspace.com
> To: detomaso at realbig.com
> Subject: [DeTomaso] More valvetrain for 6143
> 
> 
> The pushrods are straight within my measurement limit, which is the 
> granite tops in the kitchen.
> They also have a good spec - CompCams 7502 Magnum etc.
> http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=7502-16&Category_Code=ClevelandPushrods
> 
> The rockers are CompCams - BB ford, cleveland or BB chev
> http://www.compperformancegroupstores.com/store/merchant.mvc?Screen=PROD&Store_Code=CC&Product_Code=1411-16&Category_Code=ClevelandRocker
> 
> The lifters should also be CompCams but I don't have one out yet.
> The pushrod aperture is about 15/32",
> Will a lifter come out through that??
> 
> OK the big news
> #5, 6 & 7 are clean. The worst misalignment is no more than 0.050
> #8 is a mess
> - the exhaust lifter is OK but the exhaust valve is peened away across 
> half the top of the stem
> http://www.poca.com/index.php/gallery/?g2_itemId=15208
> - the intake valve is OK but the intake lifter has a big bloody pit 
> hammered in the roller and the rollershaft is bent.
> http://www.poca.com/index.php/gallery/?g2_itemId=15214
> Here's one guess.
> They threw it together and started it and it made a bitch of a racket.
> They pulled it apart and found they didn't have the #8 exhaust 
> pushrod in place and it had made a big mess,
> They swapped the intake & exhaust lifters and lined them up as best 
> they could in their @$#$-up state
> and got it to quiet down - then pushed it out the door
> 
> So looks like the head has to come off and I'll need a new exhaust valve 
> and a pair of lifters.
> If anyone can imagine another choice for me I'm all ears.
> 
> Can't wait to see the left bank. (or the #8 exhaust lifter)
> Looks like I won't have to worry about emissions testing for a while.
> 
> ^%&#$#*&
> dave
> 
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