ZR-1 Net Registry Forums - View Single Post - anyone have a near stock zr-1 with the secondaries removed?

tomtom72 · 07-30-2011

I type too slowly to keep up!

There has been experimentation in the area of adding plenum volume. The under hood clearance is an issue so the people that added plenum volume did so by dropping the floor as there is some room to allow this and not have clearance issues to the coil packs. I'm just not sure if this has benefit on a stock displacement motor or if you need more cubic inches to take full advantage. Also, although not specific to your point about plenum volume, it is common when porting aggressively to remove the dividers in the legs and the head ports to some degree or even eliminate the dividers in the legs entirely.

There is a thread here where a member did some re-engineering of an LT5 to make it a 427 cu. in. motor. If you can find that thread it has some interesting photos. We also have some pictures of the second design LT5 in the proto-type section. There was also a very interesting seminar given by Dave & Graham at our 20th anniversary Gathering last year about the second generation LT5.

Tom

This is the link to the 427 thread: http://www.zr1.net/forum/showthread.php?t=10268

07-30-2011	#3
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,609	Re: anyone have a near stock zr-1 with the secondaries removed? I type too slowly to keep up! There has been experimentation in the area of adding plenum volume. The under hood clearance is an issue so the people that added plenum volume did so by dropping the floor as there is some room to allow this and not have clearance issues to the coil packs. I'm just not sure if this has benefit on a stock displacement motor or if you need more cubic inches to take full advantage. Also, although not specific to your point about plenum volume, it is common when porting aggressively to remove the dividers in the legs and the head ports to some degree or even eliminate the dividers in the legs entirely. There is a thread here where a member did some re-engineering of an LT5 to make it a 427 cu. in. motor. If you can find that thread it has some interesting photos. We also have some pictures of the second design LT5 in the proto-type section. There was also a very interesting seminar given by Dave & Graham at our 20th anniversary Gathering last year about the second generation LT5. Tom This is the link to the 427 thread: http://www.zr1.net/forum/showthread.php?t=10268 __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member Last edited by tomtom72; 07-30-2011 at 09:02 AM.