Dear Dave,
Howdy! Some questions/comments re: your last post;
Subject: Re: SBC geometry long rods vs. short
"custom ported set of heads for a longer rod engine then fine use the
longer rod but you will need a longer wallet to go with them."
"A combination NOT to build.. 2.85 stroke X 4.125 bore with 6.2
rods...with
18 degree heads.."
Grib says (not argumentative); I don't know anything about the eBay deal
but my experience with the NASCAR Ford engine builders (Yates & Roush
for sure) use a 6.2" rod 99 percent of the time. I have about 40 sets of
them in stock now, so the longer rods (used) are cheaper. Chevy builders
use them too, but tend to use mostly 6.125". Most all use a large bore
4.125" and short stroke, 3.335. Why do you suppose they have gone this
direction if it's so wrong?
The other thing I noticed with NASCAR is they have generated to a very
radical (perhaps) rocker ratio. Yates runs 2.1 to 2.3 ratios and I am
told, this is to reduce the reciprocating weight. (I have 1.65 and 1.7
in the T'Bird) I suspect the cams look like they're worn out, but they
also run these engines above 9,300 PRM for 5 hours straight. It is
possible that with the loss of a "qualifying engine", some of these
designs may change. Any thoughts?
"Another combo that works well is the Buick V-6 but that is another
discussion. Especially in turbo trim their performance is legendary."
I bought a lot of Buick V6 stuff from McLaren Racing and they ran 6.5"
rods in all their stuff. Again short stroke, both turbo an NA. I plan on
using the Buick's in the Merkur, probably an NA "E", "D" and something
turbo'ed.
BTW, I have a couple of Ford V6, 4 Buick V6 and 2 Chevy V6, 274 cu.in.
500-600 HP motors in stock if anybody's interested.
"Above all don't build an egine because you have 1 or 2 parts laying
around and have to buy the rest. It all becomes a compromise for the 1
used part and the results will bear this out. If you want to build an
engine with used or low buck parts only buy the ones used that are
specifically a match for what you are trying to accomplish in the
first place. Yes the rest may have to be new. For a Chevy the only
parts I would ever buy up front for no particular purpose is a good 4
bolt 4.000 in bore block and a set of 6 inch large journal Carrillo
rods."
I agree but a BowTie on the block is desirable and Carrillo is a must.
Grib
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