Quote:
Originally Posted by Engo
BBC stock bore spacing is 4.84"  |
I intentionally made the proposed Pontiac Bore Spacing 4.8" vs 4.84" so that you could say that you have not copied a STOCK 396 CID BB Chebby Block Bore Spacing. Note: almost every Aftermarket BB Chebby Block is larger in Bore Spacing vs the factory 4.84" number.
Admit it, we currently are limited on boosted engines to a smaller (more dependable) bore size around 4.250" to maintain a .375" gasket width between the cylinders.
With a 4.8 Bore Spaced block we could use a piston with a 4.425" bore vs a 4.250" bore
(almost .200" BIGGER). The 482 boosted engine would now be a "521" Boosted engine
(100 cubic inches more than the old 421 engine) and WITH BOOST!
Tom Vaught