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Splittin hairs. Put the 518 in it and gear accordingly.
Here ya go
Small blocks 340/360 get about the same mileage it doesn't matter what you do. If you veer from stock cam into performance cams... the mileage just goes down at a certain point. 15-17mpg. 318, little better .now Slant 6... 40 mpg ,mother f'r, just ask any slant owner. Lol jk
Used all my slant 6’s for sinker weight when I go fishing.
Ok. I got it now. Referencing the fast idle cam made it come into focus.
But you're right. Slant guys who got 35 plus MPG are around every corner. Just wait. One will be along any minute.
I have never ever been able to get a slanty up to the numbers of a hi-compression 360, even after I took it apart, and boosted the compression up to a true 9.5. And spent way too much time sorting the combo. Total waste of money and time....... compared to what I got out of my 367 . Check out TBs post. #15 Smart cookie that TB
We've already figured out your 367 is at the top of the heap. Just ask you.
Good point. After all, 38 mpg’s out of a Hyd. roller cam @ 224@050 that revs to 7K in that is amazing. Even runs on Yak piss 87.
32mpgUs,and it was a FTH cam, and it was a 223@.050.. Try to keep up. TBs at 25mpg @75/80mph @2100rpm, how is 32mpg @65 a stretch@1600rpm? From 25 to 32 is an increase of 28% mpgs, and from 1600 to 2100 is an increase of 31% rpm; I don't see the big deal. I believe TB cuz I know it can be done. Like I keep saying; just cuz you can't do it doesn't make it impossible.
But AJ, do t you know everybody gets 35+ and 7K tire shredding event’s with there stuff?!?! Building a mileage master is/was a challenge I always wanted to try.
Over the years I've read a lot of posts stating that a larger transmission robs huge amounts of power. I actually read that a C6 takes 60 horsepower away. Here's the flaw in the thinking and observation. A 727 is going to most likely come out of a larger car or a truck. They utilize a lower stall converter. If you put that into a lighter car, it will be slower on takeoff; just like a th400 has a larger converter than a th350, a C6 has a larger converter than a C4. With the same stall, the big trans won't produce a noticeable difference in the seat of the pants; only in a fraction of a second on a time slip.