Quote:
Originally Posted by wfot
Impressive. the curve stays much flatter after the work. do you have any pictures of the bowl area?
The block I have, i believe, was done by Krichner (sic), I believe he block was used in Kirt white's 415. 12mm studs on all mains. The heads are probably done by krichner as well, the work is top quality. I did find a few variations on the ports mouth at the head, most are 37+ a few are under. I will be correcting this..
my understanding is that most builders, not lt5s, SBC, back cut the intake and not the exhaust. If you compare before and after flow numbers, the back cut does hinder some flow over .500 inch. but under .500 there is almost always a flow improvement. I feel that the multi valve engines can benefit from better low lift improvement and will not suffer the high lift problems of 2 valve motors...
I also heard there was an exhaust port trick on the LT5 that takes away the point just where the ports meet in the middle... if that shape edge is removed, it is worth about 10 hp... this has been done on my heads.
I appreciate the input/comments
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Yes, Ryan (a builder now in Phoenix, last I heard) told be about this trick too. Easy enough to do, so I removed that sharp junction in my exhaust ports as well.
No pix on the bowls OR the exahust ports (sorry). But I followed Ryan and Pete Polatsidis's advice and enlarged (slightly) the intake bowls AND removed the tights and all castings resulting in what would be an impediment to smooth air flow (in and out of the cylinders). NO pictures, as I promised Ryan and Pete I would not divulge specifics. But, there are dozens of books written on the subject and lots of examples (photos) in the public record.
One of my favorite examples that clearly demonstrates the
principals of what good porting should look like is captured in this picture of a pair of Webber velocity stacks...says it all. This is not from an LT5, mind. But, it does say volumes to those with the least bit of curiosity about what good porting should endeavor to accomplish in the end...hint, hint!
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