CO_Sledgehammer

Gentlemen,

I'm having a 406 built that uses the 168-tooth ext. bal. flywheel. I recently purchased a GMPP Bow-tie Gear Reduction Starter (Part # 12361146 ) that works fine w/ my 327, but I'm wondering if it will work w/ the 400 block?

Does the 400 SBC use the straight or staggered bolt configuration?

John

Cor6996vette

It used to be a 350 in my and I replaced with a 406 ex. balancer, 168 tooths flywheel and use the same starter. maybe the same for 327 to 406.

The Dude

All three 400 blocks I have owned (all different casting numbers) have been drilled and tapped for the staggered starter bolt configuration. Interestingly enough, one of them is an "either/or" setup. That's not to say they're all like that, tough.

DREGSZ

my 400 block was staggered.
The starters that have the staggered positions and the "cover" over the starter gear, are 400block specific and work great, the blocks that have the inline will take most straight across bolt patterns in the shifted out to the passenger side position but may require varying extent of shimming,
good luck

The Money Pit

My casting was a 511 4 bolt block,and the starter mounting uses staggered bolt holes.Same starter was used on the previous 355.