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BBC SR20's - need to know how good?
Posted: Sun Jan 31, 2021 1:31 pm
by David Vizard
I have not been able to do any dyno testing on SR20 BBC cylinder heads.
I am doing a BBC porting video and I feel I should cover these heads in reasonable detail. They have a reputation for making better than average race power. Can anyone confirm this???
DV
Re: BBC SR20's - need to know how good?
Posted: Sun Jan 31, 2021 7:35 pm
by mt-engines
they are an easy 1050hp with a single carb mild compression ratio and a cam under .800" lift
Re: BBC SR20's - need to know how good?
Posted: Sun Jan 31, 2021 8:48 pm
by racear2865
Im building a 631BBC for a customer. I can give u the flow numbers tomorrow when I get back in the shop. have the intake also and 600 hp nitrous
reed
Re: BBC SR20's - need to know how good?
Posted: Sun Jan 31, 2021 9:56 pm
by bob460
Alex Hays in his mustang ran 4.60s in 1/8 NA 588ci Uratchko built heads by Slick Rick..........Badass!!
https://www.youtube.com/watch?v=a8xNDPU6Eq4
Shafiroff make a crate engine 632 with 10.7 comp pump gas 1050hp.
Re: BBC SR20's - need to know how good?
Posted: Mon Feb 01, 2021 10:21 am
by prairiehotrodder
I've heard that the BR20's are the poor mans version and have alot to offer.
Re: BBC SR20's - need to know how good?
Posted: Mon Feb 01, 2021 1:11 pm
by racear2865
450cc
96cc chamber
2.400/1.800
4.600 fixture
2.125 pipe
.200 164/123
.300 232/171
.400 310/214
.500 380/255
.600 435/296
.700 485/316
.800 499/330
.900 512/339
1.00 516/344
sr20.jpg
this is with 50 degree seats and not 55
reed
Re: BBC SR20's - need to know how good?
Posted: Mon Feb 01, 2021 1:40 pm
by ClassAct
David Vizard wrote: ↑Sun Jan 31, 2021 1:31 pm
I have not been able to do any dyno testing on SR20 BBC cylinder heads.
I am doing a BBC porting video and I feel I should cover these heads in reasonable detail. They have a reputation for making better than average race power. Can anyone confirm this???
DV
Can you check your PM’s David?? Thank You.
Re: BBC SR20's - need to know how good?
Posted: Mon Feb 01, 2021 3:46 pm
by Abbottracingheads
They are significantly better than regular bbc heads.
Re: BBC SR20's - need to know how good?
Posted: Tue Sep 21, 2021 2:29 am
by AA Performance
racear2865 wrote: ↑Mon Feb 01, 2021 1:11 pm
450cc
96cc chamber
2.400/1.800
4.600 fixture
2.125 pipe
.200 164/123
.300 232/171
.400 310/214
.500 380/255
.600 435/296
.700 485/316
.800 499/330
.900 512/339
1.00 516/344
sr20.jpg
this is with 50 degree seats and not 55
reed
Just wondering how much the steeper valve seats are worth. I think the Brodix SR20 have a 50° intake and 55° exhaust seat or am i wrong? Does any one know how the BRX as cast heads compare as they seem as they are as good as the CNC ported and only drop off at .700" and up slightly? The original topic didn't seem to get into it very much and was short lived.