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Mar 9, 2016 | 06:58 PM

#101

Owtlaw

Road Warrior

Joined: Oct 2011

Posts: 1,376

Likes: 36

From: Round Rock, TX

Downshifting to make a pass is normal. What speed and RPMs are we talking about?

Mar 9, 2016 | 07:07 PM

#102

texashillcountry

Dirt don't hurt

Joined: Jan 2011

Posts: 21,065

Likes: 4,561

From: Haslet Texas

Quote:

Originally Posted by Owtlaw

Downshifting to make a pass is normal. What speed and RPMs are we talking about?

With a stock motor it is.
With a built up motor you shouldn't have to.

Mar 9, 2016 | 07:33 PM

#103

Owtlaw

Road Warrior

Joined: Oct 2011

Posts: 1,376

Likes: 36

From: Round Rock, TX

Quote:

Originally Posted by texashillcountry

With a stock motor it is.
With a built up motor you shouldn't have to.

Disagree. But it all depends on the speed and the revs. And your expectations of how much you should get from a roll on.

Mar 9, 2016 | 08:06 PM

#104

98hotrodfatboy

Seasoned HDF Member

Joined: Mar 2010

Posts: 21,093

Likes: 7,622

From: Poolville

It's typical to downshift from 5th, Don't forget you didn't bore or install higher comp pistons. All you did was change the cc of the heads also I don't think you did any porting or bigger valves, did you?. Do you know what the combustion chamber is in cc's? Also what head gasket did you use? Once I know all that I can make a better educated statement.

One more thing, do you know where the pistons are sitting in the hole...?

Last edited by 98hotrodfatboy; Mar 9, 2016 at 08:12 PM.