Quote:
Originally Posted by 64speed
Engine Masters did a show on the 4/7 swap. Advantages were nonexistent in their application.
|
Nonexistent? Or just "sloppy and incomplete test procedure" mainly intended to get clicks and not promote REAL knowledge, and so they didn't find--or even look for--all the potential advantages?
The 4/7 swap moves the heat load of the 5/7 cylinder pairing from the rear of the block (hottest part) to the front of the block (coolest part--right next to the water pump).
A proper 4/7 & 2/3 swap like the LS firing order, removes load from the overloaded #4 main bearing, and puts it on #2 which would otherwise be under-loaded. In fact,
that was why the LS engine uses that firing order--to even-out main bearing loading.
Quote:
Originally Posted by Iggy
Where would one look to having a cam nitrited?
|
When it was me, on an Olds 455, I had Lunati take care of it. Way back then, I think it was an additional $110. It about doubled the cost of a flat-tappet cam. No doubt it's far more, now. Thanks, F. Joe Biden.