BBC Bowtie block cylinder bore limits
Moderator: Team
BBC Bowtie block cylinder bore limits
My 9.80 Mk 4 BBC bore is 4.565 now.
Casting 10051107
Part number 10051106
274#
Anyone know if this will go to 4.600 without grouting? 15:1 drag race engine
Thanks
Casting 10051107
Part number 10051106
274#
Anyone know if this will go to 4.600 without grouting? 15:1 drag race engine
Thanks
Paul
Adv Et Dragracer
Adv Et Dragracer
I am really not certain why, but GM is very mild when they put in print what their blocks are capable of in the way of max bore. They say that the bowties are only good to 4.560 and I have two in my shop by 'very prominant builders' that are both over 4.610 and not filled.
Then when compared to the dart and merlin (not pro) that advertise 4.625, the Bowtie and CNC Bowtie have very similar wall thickness.
Then they say that their DRCE I blocks are only good to 4.600. Please show me a pro stock runner that had a bore in these blocks even close to that.
I don't want to say "Sure" because I don't know the history of your particular block, the options, etc. But I am doing a circle boat engine right now with that block that will be 4.615.
Then when compared to the dart and merlin (not pro) that advertise 4.625, the Bowtie and CNC Bowtie have very similar wall thickness.
Then they say that their DRCE I blocks are only good to 4.600. Please show me a pro stock runner that had a bore in these blocks even close to that.
I don't want to say "Sure" because I don't know the history of your particular block, the options, etc. But I am doing a circle boat engine right now with that block that will be 4.615.
I have this same block.
Aside from the above sarcasm, has anyone had issues with this block being bored to 4.625? my block is at 4.530 now, needs to go 4.560, and I am trying to make sure i can update in the future if necessary.
If it will go to 4.625, i will be satisfied. If i have to fill, its not a problem, but i would like to know the limit before i ruin it by not filling it.
Aside from the above sarcasm, has anyone had issues with this block being bored to 4.625? my block is at 4.530 now, needs to go 4.560, and I am trying to make sure i can update in the future if necessary.
If it will go to 4.625, i will be satisfied. If i have to fill, its not a problem, but i would like to know the limit before i ruin it by not filling it.
Duane
http://sutherlinbbfest.org/
http://sutherlinbbfest.org/
Ouch!speeedr wrote:Define < prominet builder > ? does he write for hot boat magazine maybe ?
No, I meant prominent when I said it.
In answers to your question, those Bowties will be fine at 4.560 and beyond. I like them every bit as much as the Darts and Merlin II and III for strength. (As long as the block has not been totally hammered or really screwed up in the past. There is always that concern.)