CDNpontiac409guy
Banned
This is the big one for me. I have limited experience with the more radical, race oriented stuff. This particular engine is destined for street use... albeit marginal. My customer says that his current 450 HP engine is fine, but just doesn't deliver that gut wrenching ride that he's looking for.
What is in place:
409 car block, .060" over, 12.5:1
3.766" stroke ( 366/396/427 crank )
6.386" rods
Stef's oil pan
Just received a set of Bob Walla 409 heads... the CNC ported version.
a few photos:
These came to me as you see them here, with Bob's own guide plates, arp studs, and 11/32" stem PEP valves.
Bob Walla's heads don't have the mini combustion chamber, and the valves seat slightly above flush with the gasket surface. May be necessary to add a little more flycut to the valve reliefs in the pistons... which is OK, because losing a bit of compression ratio won't hurt.
The exhaust ports / bowls in these heads, are completely beyond anything that could be done with a stock head, or Edelbrock heads. These things are something
The intake port floor takes a pretty good up-swing, and then rolls over high into the back side of the valve.
I believe was 340 CFM @ .600" lift.
These are going to take a little port matching.
Can't tell from this photo... but the seat to bowl blending is flawless !
What is in place:
409 car block, .060" over, 12.5:1
3.766" stroke ( 366/396/427 crank )
6.386" rods
Stef's oil pan
Just received a set of Bob Walla 409 heads... the CNC ported version.
a few photos:
These came to me as you see them here, with Bob's own guide plates, arp studs, and 11/32" stem PEP valves.
Bob Walla's heads don't have the mini combustion chamber, and the valves seat slightly above flush with the gasket surface. May be necessary to add a little more flycut to the valve reliefs in the pistons... which is OK, because losing a bit of compression ratio won't hurt.
The exhaust ports / bowls in these heads, are completely beyond anything that could be done with a stock head, or Edelbrock heads. These things are something
The intake port floor takes a pretty good up-swing, and then rolls over high into the back side of the valve.
I believe was 340 CFM @ .600" lift.
These are going to take a little port matching.
Can't tell from this photo... but the seat to bowl blending is flawless !