|
|
|
Re: Truck 440 build recipe
[Re: Pat_Whalen]
#558585
12/24/09 07:15 AM
12/24/09 07:15 AM
|
Joined: Jan 2007
Posts: 7,664
IN
ahy
master
|
master
Joined: Jan 2007
Posts: 7,664
IN
|
Quote:
I guess the next question would be, what is the safest compression ratio you can run on pump gas with iron open chamber heads.
The KB237s calculate out to 9.9:1 CR. Is this to high to run pumpgas on?
I don't really intend on trailering anything, so out goes lugging it up hills. I did talk to the guy who will most likely be doing my machine work and he mentioned the machining of the pistons for an appropriate quench would cost quite a bit extra and may not be worth it if budget and daily driving are in the equation. He did suggest the KB237s and then work the compression ration around how far they wind up in the hole.
The "rule of thumb" is max 9.5 cr for iron heads and pump premium. In a truck with fairly small cam I think 9.0 would be safer.
|
|
|
|
|
|
|
