Frankenblazer
Registered Member
Trying to figure out what rough guess compression ratio, ultimately would like to select best camshaft, I have 14bolt 4.10 35s, th350 carb 750
CK5
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148 bbc heads,77 454 flat top pistons CR
- Thread starter Frankenblazer
- Start date
TreeFarm
Internet fabricator.
bore diameter, stroke, head gasket thickness, head chamber size, piston deck clearance, and piston dish/dome size are needed.
454 is 4.25" bore and 4" stroke.
Those heads should have 112cc chamber.
Im guessing .04o head gasket thickness for a standard felpro gasket.
Guessing some numbers that I don't have I would say 8:1
If you figure out those numbers you can plug them into a compression ratio calculator like this
454 is 4.25" bore and 4" stroke.
Those heads should have 112cc chamber.
Im guessing .04o head gasket thickness for a standard felpro gasket.
Guessing some numbers that I don't have I would say 8:1
If you figure out those numbers you can plug them into a compression ratio calculator like this
Frankenblazer
Registered Member
Cool thanks for info
biggest mistake people make is wrong build type for vehicle .
make sure for your build you get a good low to mid rpm torque cam for the BIG HEAVY 4x4 .
mid to high rpm stuff does almost nothing to help you .
torque gets you Rollin . hp keeps you Rollin just remember this .
make sure for your build you get a good low to mid rpm torque cam for the BIG HEAVY 4x4 .
mid to high rpm stuff does almost nothing to help you .
torque gets you Rollin . hp keeps you Rollin just remember this .
Frankenblazer
Registered Member
That's exactly what I'm trying to figure out .its my daily driver I drive 44 miles round trip ,1/4 of drive under 30 dirt roads, not maintain well, 1/4 40 mph then 1/2 55mph very rarely above 60 mph, wood 4x4 pulling my son's 04 f350 power stroke,out of mud 2x a month lol, I enjoy the low end torque
I agree with @TreeFarm , stock pistons with open chamber heads is going to be about 8:1. Those 112cc heads are slightly smaller than the typical 119cc heads so maybe 8.5:1 on a good day.
A quick search suggests that those heads could have come on a tall deck, as such they are not made to breath heavy so don’t go with any cam that needs more than 5k rpm.
A quick search suggests that those heads could have come on a tall deck, as such they are not made to breath heavy so don’t go with any cam that needs more than 5k rpm.
Frankenblazer
Registered Member
Would I be better off to buy a set of aftermarket heads and matching cam kit .or have head work done then change pistons
049 or 781 or aftermarket
this tends to be the best 3 head options .
but if you got baby pistons keep the cc dome small to bump the comp ratio as big as possible .
this tends to be the best 3 head options .
but if you got baby pistons keep the cc dome small to bump the comp ratio as big as possible .
Frankenblazer
Registered Member
Good info, thanks. It has flat top pistons in it now,has aluminum intake but no name brand just says made in China, with 750 carb.
