Head Shave

[flattrakker]

800 feet above sea level. wouldnt mind running a higher octane fuel. what should i go with?

[Bansh-eman]

20 is pretty common. just keep in mind with a stock head when you save it your not olny making your domes smaller but your tightneing the squish. to much and you will constantly blow your head gasket

[twister688]

20 is pretty common. just keep in mind with a stock head when you save it your not olny making your domes smaller but your tightneing the squish. to much and you will constantly blow your head gasket

 

 

 

if it were me i would have the head decked .050 squish recut to about .045 and o ring the head no more worries about blowing stupit head gaskets. i know someone who does head work for cheap hit me up and i will help you out.

 

sean. m :thumbsup:

Edited November 16, 2007 by twister688

[Bansh-eman]

if i was going to go through that id just buy a coolhead.

[flattrakker]

well one problem its already at the machine shop. im doing this as a quick pump up in compression. i eventually will buy a coolhead.

[Bansh-eman]

id say deck it 20 ... 30 at most, and make sure you do a compression test when u get it back

[Wildcardracing]

You should try to run the lowest octane fuel you can get away with. It makes more power and as an added bonus it is easier on the wallet. 160 psi of cold cranking compression is where I would seriously consider 100 octane, 140 to 150 psi 50/50 with 91, below 140 psi premium pump gas.

[Bansh-eman]

You should try to run the lowest octane fuel you can get away with. It makes more power and as an added bonus it is easier on the wallet. 160 psi of cold cranking compression is where I would seriously consider 100 octane, 140 to 150 psi 50/50 with 91, below 140 psi premium pump gas.

please explain how the lowest octane fuel makes more power?

[flattrakker]

i really dont think premium (93 Octane around here) and 100LL have much of a difference between them... id say running 120 octane race gas in 130 lbs of compression might be a waste of money and time. im shooting for 130 or so and i believe 100LL will help it out.. will it not?

[Bansh-eman]

130 you can get away with 93 more then likey

[flattrakker]

what do you think ill be pushing for compression with 0.010 off the head?

[91banshee]

please explain how the lowest octane fuel makes more power?

if you use more octane than you need. "Over Octaning" or running ( race gas) in motors like his can actually reduce

performance because of the slower burn speed of high-octane gasoline.

my 421 cub ran the best with 93 , on the other side if he did have high compresion domes he would benifit from a high octain gas

[Bansh-eman]

if you use more octane than you need. "Over Octaning" or running ( race gas) in motors like his can actually reduce

performance because of the slower burn speed of high-octane gasoline.

my 421 cub ran the best with 93 , on the other side if he did have high compresion domes he would benifit from a high octain gas

this does not mean that lower octane makes more power. its just simple rules of physics and combustion. but you can not make a blanket statment that lower octanes make more power because that is not the case.