051 bowtie block
- Thread starter sean
- Start date
Lynn D. Brown
New member
Re: 051 bowtie block
I have .020 J&E Extreme Duties w my Bowtie. Went w the Eagle Rods also - had to clearance the Oilpan for them and the massive steel Main caps.
I have .020 J&E Extreme Duties w my Bowtie. Went w the Eagle Rods also - had to clearance the Oilpan for them and the massive steel Main caps.
Syborg Twin Turbo
Syborg Twin Turbo
Re: 051 bowtie block
depends on the bore of the block you have
depends on the bore of the block you have
nightdiver
Active member
Re: 051 bowtie block
go with .20 or .40
the block is maxed out at 4.160. You will use this block in many rebuilds this way. if you go 4.160 or 4.155 you will have to use sleeves right after that
go with .20 or .40
the block is maxed out at 4.160. You will use this block in many rebuilds this way. if you go 4.160 or 4.155 you will have to use sleeves right after that
Syborg Twin Turbo
Syborg Twin Turbo
Re: 051 bowtie block
it all depends on the heads - take them to the machine shop with the block and they can tell you exactly what you need. It's better left to them to decide then trying to figure it out.
it all depends on the heads - take them to the machine shop with the block and they can tell you exactly what you need. It's better left to them to decide then trying to figure it out.
nightdiver
Active member
Re: 051 bowtie block
4,020 bore with 3,75 shaft gives a 285,46 cui engine
4,040 with 3,75=288,31
4,060 with 3.75=291,17
4,100 bore with 3,75 shaft gives a 296,93 cui engine
4,155 with 3,75 = 304,95
More cui will let you run bigger cam with good vacuumm at idle. I would do the 4,060 pistons . I dont know if you need to custom order them. Some times off the self parts comes with better price. Id say call JE for availability on the oversized pistons and then you decide
Oh, i would also try a 9.5 :1 engine if i didnt want to run high boost.
4,020 bore with 3,75 shaft gives a 285,46 cui engine
4,040 with 3,75=288,31
4,060 with 3.75=291,17
4,100 bore with 3,75 shaft gives a 296,93 cui engine
4,155 with 3,75 = 304,95
More cui will let you run bigger cam with good vacuumm at idle. I would do the 4,060 pistons . I dont know if you need to custom order them. Some times off the self parts comes with better price. Id say call JE for availability on the oversized pistons and then you decide
Oh, i would also try a 9.5 :1 engine if i didnt want to run high boost.
Windedv6
Ty n 10s
Re: 051 bowtie block
Depends on the block. Depends on how centered the bores are in the casting as well. Have it sonic checked. That way you know where the thinner/thicker walls are. My Katech block was one of the better ones I have seen. After it was checked we had more than enough to go 4.180 - 4.200. I stayed with a 4.155 as I could get it a shelf piston...then J&E talked me into a custom set anyway. My block is a 4.125 block and the 4.155 is .030 over bore for that block.
John
Depends on the block. Depends on how centered the bores are in the casting as well. Have it sonic checked. That way you know where the thinner/thicker walls are. My Katech block was one of the better ones I have seen. After it was checked we had more than enough to go 4.180 - 4.200. I stayed with a 4.155 as I could get it a shelf piston...then J&E talked me into a custom set anyway. My block is a 4.125 block and the 4.155 is .030 over bore for that block.
John
nightdiver
Active member
Re: 051 bowtie block
10185051 Cylinder Case, V6-90 Degree CNC Machined
This block was revised in year 2000. It is fully CNC machined from the 10134388 casting. It features siamesed cylinder bores, priority main oiling, 8620 steel main caps, the three center mains are splayed 20 degrees on the outer bolts. It featurs 2" OD cam bearing at all four locations. Deck height is 9.025" and comes finished bored at 3.980". Maximum recommended bore is 4.150". The block now features wet sump oiling.
10185051 Cylinder Case, V6-90 Degree CNC Machined
This block was revised in year 2000. It is fully CNC machined from the 10134388 casting. It features siamesed cylinder bores, priority main oiling, 8620 steel main caps, the three center mains are splayed 20 degrees on the outer bolts. It featurs 2" OD cam bearing at all four locations. Deck height is 9.025" and comes finished bored at 3.980". Maximum recommended bore is 4.150". The block now features wet sump oiling.
ghettosled
SYTY SUPERSTORE
Re: 051 bowtie block
with the pontiacs you'll be shooting yourself in the foot with a 4.060 or smaller bore.
with the pontiacs you'll be shooting yourself in the foot with a 4.060 or smaller bore.
nightdiver
Active member
Re: 051 bowtie block
Ηe is going with a 3,75 shaft Mike. My set up was very streetable with just 266cui.
What would you do ? 4.100 ?
ghettosled said:
Ηe is going with a 3,75 shaft Mike. My set up was very streetable with just 266cui.
What would you do ? 4.100 ?
Windedv6
Ty n 10s
Re: 051 bowtie block
You should do a 4.125 as it is a market standard bore size which makes it easier get pistons, rings and gaskets. Most of the shelf pistons such as J&E extreme turbo piston come in a 4.125 bore size. Custom pistons become expensive and your are on your own after you oder them. Also the 4.125 bore will allow clearance if you go to bigger valves.
John.
You should do a 4.125 as it is a market standard bore size which makes it easier get pistons, rings and gaskets. Most of the shelf pistons such as J&E extreme turbo piston come in a 4.125 bore size. Custom pistons become expensive and your are on your own after you oder them. Also the 4.125 bore will allow clearance if you go to bigger valves.
John.
ghettosled
SYTY SUPERSTORE
Re: 051 bowtie block
just listen to Marty and let someone who knows what they are doing figure it out for you. You are not gonna get anywhere from asking people on the board what you should do. They dont have your parts in hand, therefore they cant make an educated decision on how to put it together. Your building a race engine, not a stock rebuild.
Syborg Twin Turbo said:
just listen to Marty and let someone who knows what they are doing figure it out for you. You are not gonna get anywhere from asking people on the board what you should do. They dont have your parts in hand, therefore they cant make an educated decision on how to put it together. Your building a race engine, not a stock rebuild.
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