Thread: heads

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im jus going in the rebuild im not going to stroke the motor some one told me to look into 441 or 993 heads how will these help my 305 i jus want a motor that i can drive to south Ga an back with no kind of problem

you could buy a set of dart 49cc heads, I'm not shure of your current compression but 305 heads are 58cc, so the dart 49cc heads would bump your compression ( more power ) and be better flowing ( more power ), there not that expensive ither. you may have to run premium due to higher comp tho

Originally Posted by Matt167

you could buy a set of dart 49cc heads, I'm not shure of your current compression but 305 heads are 58cc, so the dart 49cc heads would bump your compression ( more power ) and be better flowing ( more power ), there not that expensive ither. you may have to run premium due to higher comp tho

The 49 cc heads you a refering to have a port volume of 180 cc.This is way to much cylinder head for a stock 305 engine and even if he builds a 334 they might still be on the big side.

Whoever gave you the 441/993 suggestion probably has a set they want to sell. Those are 76cc heads and will put your compression soooo low.

Originally Posted by MI2600

Whoever gave you the 441/993 suggestion probably has a set they want to sell. Those are 76cc heads and will put your compression soooo low.

I was the person who made this post.
If you go back and read his posts he has talked about building just about everything.
The reason for the 441/993 post was the 305 heads are much more prone to cracks than the 441/993 and on a 334 which he talked about building they will work fine with a flat-top piston.

yeah as stated above with the intake port volume.....180's i feel would be the max that the small bore could handle, and thats pushing it....stock 416's are good for the small chamber, but stock they are like 160cc....opening them up and unshrouding the valves as well as installing 1.94's seem to work well, thats what I did. I'm running true flat tops in mine with a .471" lift cam. This seems to work well with my combo, have to be carefull with the cam selection because the small bore can only suck so much into it.