Stock rod length or 6.200 for 393 stroker?

[Ant]

Jac Mac,

Yes you are right I got that one upside down!!

Infamous muffler design sounds interesting!

[Mark O'Neal]

Originally Posted by Jac Mac

Im afraid I go with the 'long as possible' rod club as well.

So am I, sort of.

First I decide how much power I want to make. Then I decide what engine I want to use. Then I pick the longest rod I can comfortably use in that combination.

But it's still irrelevant...and, even after 35 years of doing this...I don't have a good reason.

[Mus408]

I just researched,one of the most successfull current production engines,made today...the Corvette's LS-7.
It has the 4.125 bore and 4.000 stroke coupled with a 6.067 rod length,which gives a 1.51 rod/stroke ratio. So,if it works for them for a long life,should be fine.
Would it not be great,to have off the shelf heads,like those of the LS-7,for the smallblock Ford! 2.20 intake valves and 360 cfm stock from the factory!
And we think that a 225 cc intake runner size is big doings,on the Ford 427 strokers.

[Jac Mac]

Flow rates are fine, but one thing that bugs me when people start talking port volumes; Its only relevant when comparing say one BBC intake port to another BBC intake. Take an FE head for example- valve stem centerline to intake port face is considerably shorter and port volume lower than most other designs since pushrods go thru intake manifold.. Also if you look at many of the newer heads with raised inlet porting the volumes are larger than stock due mainly to increased runner length, but cross sectional area is quite often smaller. In this case it is Flow Quality, not Quantity that gets the job done.

[Mark O'Neal]

What really frosts my cookies is when they start spouting off about average cross section......

What crap.