Push Rod Length

[Dan the man]

When the cylinder heads are machined 0.065" and the deck surface has been machined 0.030" to get it true, and a thinner head gasket is used, how much does this affect the pushrod length?

 

[RustyRatRod]

When the cylinder heads are machined 0.065" and the deck surface has been machined 0.030" to get it true, and a thinner head gasket is used, how much does this affect the pushrod length?

What camshaft are you running? If it's a regrind you may not need different pushrods. The only way to know for sure is to measure.

 

[toolmanmike]

Measure to be sure. There are adjustable pushrods made for that purpose.

 

[Rapid Robert]

you might checkout "pushrod geometry for engines" by Straub on utube. he says that at half lift you want the pushrod length that will put the rocker/valve at at a right (90 deg) angle to each other for the most area under the curve.

 

[Rat Bastid]

you might checkout "pushrod geometry for engines" by Straub on utube. he says that at half lift you want the pushrod length that will put the rocker/valve at at a right (90 deg) angle to each other for the most area under the curve.

You’d be far better of going to b3racingengines.com and reading his stuff on geometry.

 

[Rapid Robert]

I will do so, in fact I think Mike recommends this guys procedure

 

[MOPAROFFICIAL]

When the cylinder heads are machined 0.065" and the deck surface has been machined 0.030" to get it true, and a thinner head gasket is used, how much does this affect the pushrod length?

Figure the stock steel gasket @.019-.021 thick
Then do the math, 30+65=95..then the thinner head gasket....028? So you added .008 maybe...so 95-8=.087 shorter
What heads? .0048 or .0053 per every 1 cc
.087÷.005=17.4 roughly
17.4 cc's removed.
Buddy...that's a ton... be interesting to see how the intake manifold fits without a lot of milling on the faces.. maybe both heads and intake faces to split it up n maybe allow the intake to be used on something else...maybe .