What head would you run on a SC 615?

Mike Hedger · 05-20-2021, 04:03 PM

I’m currently running a conventional head BBC in an 18 Racecraft and it is doing fine but I’m thinking of building a 12 degree raptor head 615. What are your thoughts? Pros or cons if you have run them or worked with someone that has.

Or would you build a 20 degree head still a 615” tall deck?

Thanks in advance

Wayne Kerr · 05-24-2021, 10:50 AM

Hello Mike,
Since no one chimed in so far......
We have run the full spectrum of BBC heads over the years on our Super Comp cars, beginning with a 468 with some Winters foundry heads in 1990, up to today with 648" engines with 12°heads. Our 12° Raptor headed engines have always run strong. We are currently running a 20° engine in one car as an experiment, can't say its a lot faster than a 12° headed engine but it is alleged to be more durable valvetrain wise. We have broken an occasional intake rocker arm on the 12° engines ( the wide offset ones) after 300 plus runs and now have them re-bodied at some interval.

Just my .02
See you at the races,
Wayne Kerr

Mike Hedger · 05-26-2021, 09:01 PM

Wayne, thank you for the info. I bought an SR20 598 this week that I will freshen and put in this fall after I get the season over. I don’t want to start over with a new combo at the middle of the year. I thought about the 12 degree stuff and it might run slightly better I couldn’t warrant the extra cost for the little bit of power over the 20* stuff.

Everyone I know with the 20* head likes it and they make good power.

Regan Wilson · 05-27-2021, 08:04 AM

Who did the port work on the heads?

Mike Hedger · 05-30-2021, 07:07 PM

Regan, the engine was originally from Sunset I’m told but don’t know whose program the heads were ported with. Will know more after Tulsa when I get it and take it apart.

05-20-2021, 04:03 PM	#1
Mike Hedger Junior Member Join Date: Jul 2007 Location: Kemah TX Posts: 93 Likes: 0 Liked 1 Time in 1 Post	What head would you run on a SC 615? I’m currently running a conventional head BBC in an 18 Racecraft and it is doing fine but I’m thinking of building a 12 degree raptor head 615. What are your thoughts? Pros or cons if you have run them or worked with someone that has. Or would you build a 20 degree head still a 615” tall deck? Thanks in advance __________________ Mike Hedger S/C 4646 MPH Racing and Fabrication Last edited by Mike Hedger; 05-21-2021 at 11:39 AM.

05-24-2021, 10:50 AM	#2
Wayne Kerr Member Join Date: Nov 2003 Location: Out to Lunch Posts: 191 Likes: 2 Liked 26 Times in 11 Posts	Re: What head would you run on a SC 615? Hello Mike, Since no one chimed in so far...... We have run the full spectrum of BBC heads over the years on our Super Comp cars, beginning with a 468 with some Winters foundry heads in 1990, up to today with 648" engines with 12°heads. Our 12° Raptor headed engines have always run strong. We are currently running a 20° engine in one car as an experiment, can't say its a lot faster than a 12° headed engine but it is alleged to be more durable valvetrain wise. We have broken an occasional intake rocker arm on the 12° engines ( the wide offset ones) after 300 plus runs and now have them re-bodied at some interval. Just my .02 See you at the races, Wayne Kerr

05-26-2021, 09:01 PM	#3
Mike Hedger Junior Member Join Date: Jul 2007 Location: Kemah TX Posts: 93 Likes: 0 Liked 1 Time in 1 Post	Re: What head would you run on a SC 615? Wayne, thank you for the info. I bought an SR20 598 this week that I will freshen and put in this fall after I get the season over. I don’t want to start over with a new combo at the middle of the year. I thought about the 12 degree stuff and it might run slightly better I couldn’t warrant the extra cost for the little bit of power over the 20* stuff. Everyone I know with the 20* head likes it and they make good power. __________________ Mike Hedger S/C 4646 MPH Racing and Fabrication

05-27-2021, 08:04 AM	#4
Regan Wilson Member Join Date: Nov 2007 Posts: 251 Likes: 158 Liked 134 Times in 70 Posts	Re: What head would you run on a SC 615? Who did the port work on the heads?

05-30-2021, 07:07 PM	#5
Mike Hedger Junior Member Join Date: Jul 2007 Location: Kemah TX Posts: 93 Likes: 0 Liked 1 Time in 1 Post	Re: What head would you run on a SC 615? Regan, the engine was originally from Sunset I’m told but don’t know whose program the heads were ported with. Will know more after Tulsa when I get it and take it apart. __________________ Mike Hedger S/C 4646 MPH Racing and Fabrication