SB2 Heads

[go2fast]

We just did a 419 ci with a set of 11/13 clements heads with a cam at 261 in @50 and 270 @50 ex 14.4 to 1 made on the dyno to day 829 hp @ 7500 and 658 @ 5700 tq these heads are about 8 to 9 ligther pr head them the sb 2.2

[wonkie67]

Tony --- what is the maximum RPM you run in a 430 ( 4.135 bore x 4.00 stroke ) ? And can you elaborate on the reasons SB2's aren't for everyone.

We love our SB2's!!! We have a couple of different head/manifold combos, but both win races.

[sj valley dave]

We're not TBRE, but we run a 4.165 x 3.875 combo built by Bill H. Because of the piston speed, he wanted us to keep it under 8600...We normally run a 8200 or 8400 chip...We love the broad spread of power it makes....

[TBRE]

sb2.2's

Max RPM on a 4" stroke, 8400 with real good parts.
SB2.2's aren't for a rookie driver, they like RPM's, and are a little pipey, no matter who builds them. But, they are the KING on power. An inline valve engine makes more torque, but less power, same size engine. Our 388 SB2.2 makes a little over 800, an 18 about 750. Our 421 SB2.2 makes just under 880, a 13 around 830. Either will win with a good driver/car. The inline engine is more forgiving if you miss the gear.TB

[dynoman14]

Finish First is Phil Coleman. HIs work is pretty nice. He used to do a lot of Pro-Stock stuff and his SB-2 stuff is normally pretty big port volume and decent cfm/cc ratio. Most of it comes from Gibbs early plate stuff until MBE got a better port ( higher cfm/cc ratio ).

To really get any engine that drops below 5000rpm up and running, you have to be very attentive to the port-velocity and any good cylinder head guy can provide you with adequate information on your set of heads. I charge $250 for both heads with flow sheets 16 ports and an evaluation sheet on the heads.

From that point it is easy to design a cam lobe for the application.

Many times what you will find when purchasing SB-2's online or even directly from teams, they are not matched pairs. They can be consecutive numbers, or sequential but still not an even match when checking on the flow bench.

Most racers don't consider the original application of the head, was it plate, was it open, was it short track??? Plate heads stay at the same RPM +/- 500 on a good day, when racing. When we went to Talladega & Daytona we knew we were doing well when our drop in the corners was less than 200rpms.

[let-r-eat]

Max RPM on a 4" stroke, 8400 with real good parts.SB2.2's aren't for a rookie driver, they like RPM's, and are a little pipey, no matter who builds them. But, they are the KING on power. An inline valve engine makes more torque, but less power, same size engine. Our 388 SB2.2 makes a little over 800, an 18 about 750. Our 421 SB2.2 makes just under 880, a 13 around 830. Either will win with a good driver/car. The inline engine is more forgiving if you miss the gear.TB

I agree with all this right here! Little Pipey is the problem for most. They need to be moving air to perform. There's little swirl and without velocity mixture preparation is a problem.