best cam for L/SA 89 Mustang

[alejan1975]

Originally Posted by Sean Marconette

Alex,
That spec is in the engine blueprints. It shows like Bobby pointed out 0.0135ab.

Sean

thanks. i'll get a measurement on PTD and then decide what to do. luckily all I have done so far is drop in the crank and I piston to measure PTV and degree the cam.

[michael mercer]

Originally Posted by Bobby Fazio

It is a rule that you will not find in the rule book but one for which you can get disqualified if they tear down your engine. I know of a racer a few years back who got bounced for it and was using a bone stock bottom half. The '88 Mustang 5.0 is spec at .0135 above the deck along with a .041 gasket so you have to be at least .001 above and then you can use a thinner gasket.

I think it was Jay Roeder who was bounced for a below deck piston. I think NHRA
has since rescinded that rule. You just can't be above more than the given spec.
I would check with Glendora to be on the safe side though.

[JHeath]

I also got DQ'd for piston below deck .

[fordteacherguy]

WTF ?/ (What the Ford?) Bounced for below the deck? Really?

Sounds like you had some real lulus of tech guys back east. I had my motor teched in Div 6 when I set the P/SA record, the only thing that mattered was total deck + gasket thickness as allowed in the rule book. The tech guys were professional and measured everything but went by the letter of the book/ cc'd ports. pull valves/ cam check/ piston deck check/ all very through. I was impressed.

If you set a 5.0 at .0135 AB+.041 gasket =.0275 piston/head clearance. Good luck there, maybe you run yours that tight, but mine get shiny at .035. NHRA posted deck clearance specs are MINIMUM deck specs and I would expect anything below that would be ok. They come factory way below the deck!

[Mark Yacavone]

Originally Posted by alejan1975

wow. Good to know!! Dang, I might have to take this block back.

That was rescinded years ago, as pointed out.
Just get some Cometic gaskets in the thickness and bore size you need.
Leave the block alone.

[Adger Smith]

Mark,
I hate to say no, but I was doing a BB Chevy combo that has an AB demension and was told it needed to be above the deck. I think that is something that needs to be addressed and put in print. This was less than a year ago. So it might be different in Div. 4. I'm now doing a Drag Pack that calls for AB. I think I will hold up. What do any of you guys running Chevy LS say??. They call for AB in the specs, too. Hummm

[Gil Lindsay]

You should be in good hands with Ed Curtis he use to run stock and works closely with CC.

Gil