bore size bowtie and pontiacs

[sean]

what bore size are you guys running with the pontiacs?

 

[Windedv6]

Re: bore size bowtie and pontiacs

You can run all the way to 4.155 if your block can take it. I have also seen them run on 4.030. What size valves are in the heads?

John

 

[gt67sy]

Re: bore size bowtie and pontiacs

My virgin Bowtie block was started at 4.060 but had it checked and I also can go out to 4.155 on mine

 

[sean]

Re: bore size bowtie and pontiacs

You can run all the way to 4.155 if your block can take it. I have also seen them run on 4.030. What size valves are in the heads?

John

i bought the heads from a member that was using them on a 30 over block. but i was told that going that small it would be a waste of the heads. i was thinking 4.125 there are 208 160 valves. night driver's old heads.

 

[sean]

Re: bore size bowtie and pontiacs

My virgin Bowtie block was started at 4.060 but had it checked and I also can go out to 4.155 on mine

the block i have also is a virgin, it came with the sonic test sheet from gm. just need to learn how to read it. i know what you going to say. have it check anyway!