average cost to bore 302 to 306...

K

Killer5.0

Well-Known Member
#1
#1
when i go to do my engine rebuild i was wondering if it would be a good time to do this...car has 67kmi on it...dont know if its worth it or not and if i do im just wondering what i should expect to pay...i know i will need to pistons to i believe?
 
1995gt

1995gt

Active Member
#2
#2
its about 30$ per cylinder plus hot tank and new cam bearings. last time i built one it was about 375 in machine work and 300 for pistons and rings.
 
1995gt

1995gt

Active Member
#4
#4
i would do a leak down test and see how balanced the cylinders are. with 67k you should be good unless the motor has been abused. you should be between 6-10% across all 8. you can be off by as much as 15%
 
1990_LX

1990_LX

Clubhouse Moderator
#8
#8
Save the money and do a 347, you won't get a whole lot of a gain going to a 306 on an otherwise stock car. Plus if your motor doesn't even have 70k on it, why bother boring it out so little?
 
K

Killer5.0

Well-Known Member
#9
#9
dont want to do a 347 right now...this is my new plan...tell me what you think.

okay so here is a list of current mods and my new plans of what im going to do.

f303 cam (want to swap for a custom)

gt40 upper lower

bbk fenderwell cai (want to swap for AFM 3.5" powerpipe w/80mm pro-m)

bbk 70mm throttle body with egr spacer ( i will be deleting the egr as i have deleted all the other smog system so idk if i should just get a delete plate or a blank spacer?)

bbk underdrive pulleys

200amp 3g alternator (i installed)

red top optima battery (i installed)

bbk FP regulator (set at 38lbs)

stock 19lb injectors

stock MAF (was thinking pro-m 80mm?)

stock heads ( i want TW 170s)

bbk equal length headers (want to swap to either long tubes or ceramic shorties)

bbk h-pipe (want to swap to dr. gas x pipe)

borla dumps (want to swap for spintech pro-streets)

3:73 gears

b&m short shifter

i also have installed a full cobra disc swap/5 lug conversion using NRC (northracecars.com) rear axles, cables, brackets. i dont know if those axles can handle more HP than the stock items but im sure?

will be installing Maximum motorsports road and track suspension package (next year or the year after)...

now this is a 100% street car...it may see the drag strip 2-3 times in its life just to see how my mods have helped. i would like to be around 300+rwhp N/A and then maybe down the line add a S/C for a little more hp...i usually shift b4 yellow line even (4500rpm) but when i rip on it i maybe hit 5200rpm so i would like my power to stay in that range if possible....what would you recommend i keep and what should i change
 
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