The CSA of those ports is HUGE.
Short turn area of 4.37 sq inches - yet flow is only 351 cfm @ 0.600" and 2.30" valve?
Airspeed must be incredibly slow.
Something seems way off here. Perhaps a crap valve job?

 

There is nice size ridge right after the top cut on the intake and on the exhaust which would affect the low lift numbers more? Could the throat only being 88.6% start affecting the higher lift flow? I'm still learning and i'm sure the heads have more potential with a good valve job, blending the ridge in the chamber and a bigger throat.

 

I started doing some work on these Blue Print 357 CC BBC heads. The heads look like they have really good castings and are a spitting image of the AFR 357 head with some minor slight differences. So far the intakes now are 372 cc's, exhaust 131 cc's with stems, chambers are smaller than i thought and came out to 117.3 cc's after some mild chamber work with 2.30-1.88 valves. I set the pushrod pinch at 4.2 CSA, the bowl width now is 2.400" about 104% of 2.30 valve. Now I'm by no means any professional head porter and just trying to learn as much as I can by reading and watching some videos from guys like Chad Speier, Eric W, Darren and others which has been really helpful. I'm fixing to retire and will possibly be putting these on a 582 with normal bracket motor type/ limited street use solid roller, 2927 intake, dominator turning around 7000-7200 RPM's if they come out good possibly trying to making 900 HP with these heads at only 11:1 compression. The couple questions I have is what a good CSA would be to start with for a set up like this right before the short turn apex and also would be going to a 2.35" valve be a big improvement for power over the 2.30". The issue now is I don't think I have enough seat width for a 2.35 without replacing the seat which would be more dollars. Once done I will send the heads to someone to put in a good valve job, set the throat and have them flowed and check some air speeds. Any help or tips with this head project is appreciated!!

 

Nice work. I would recommend Foxwell motorsports.

 

I would get on this guys channel and check out all his BBC head and intake videos, he has some good do's and don't on porting and valve jobs videos too. I think he also has one video on what to check on china head castings. If you haven't already I think it would be worth your time.

Eric Weingartner

I own Weingartner Racing LLC. I port cylinder heads and intake manifolds for street and race applications. I am based out of Broken Arrow, Oklahoma. On my website www.wengines.com you can see the products mention on my channel. Phone number is 918-520-3480

www.youtube.com

 

May not compare, but when Dart does the Pro1 CNC 365 heads, with the 2.350" intake valves, the exhaust valve size is 1.850". I have used a couple sets of those. I cut down Manley Severe Duty 1.880" exhaust valves to fit. If you look at the Dart flow sheets, the 345, 355, 365 really don't gain that much intake flow between them, except over 700" lift. Still better over any Brodix BB2 head by 40 CFM, including the 325,365 Dragon Slayer, which I like for the money and availability.

 

BB2 heads are raised exhaust port, Race Rite are not.

 

2.3 x .89 = 2.047 throat area = 3.291sqin., this may be helping low lift flow as the velocity will increase going thru the throat from the large port, and that may be why it's that size. And I think any unshrouding of the valve head will help flow.

 

Yes, I've read nothing but good things about Foxwell motorsports and all of his builds make great power!!

 

I don't know what they flow, but a buddy has a Blueprint 632 in his full weight, show car looking 1971 Chevelle. It has a TH400 and 3.70 gear.
Naturally aspirated, it ran 9.98 in the 1/4, and on a 200hp shot it ran 9.10. In the 1/8 it ran 5.80 @ 121.
It was running out of gear in the 1/4 mile, so it was only going low-mid 140's on the bottle. I don't remember the n/a mph.

He bought it several years ago (pre covid) for around 12k turn key, carb to pan. It hasn't had a valve cover off of it, runs on pump gas n/a, and has exceeded expectations. You can drive it on a 2hr round trip if you want to buy the gas for it, and never have an issue.

I'm assuming it has the heads mentioned in this post. I don't know what they flow, but they obviously seem to be working quite well.
The engine has diesel torque and doesn't need revved to the moon to run hard. He will spin it right up to 7k rpm trying to make it to the end of the 1/4 on his 200 shot, but normally shifts it around 6500. He accidentally took off in 2nd gear one run, and it was only 0.1 seconds off. lol

He recently updated the $300 Jegs converter, so it will probably be quicker now, and not run out of gear like it did.

The heads are obviously quite adequate... and the engine has a 3yr/36k mile warranty.
Once he does decide to freshen it up (no signs of needing it now, but he may do it anyway to check the ring gap for more nitrous) he may be interested in getting the heads ported, if someone is familiar with them, or has a good program.

 

The heads were talking about are the PS8012 358cc’s, they also make a smaller 315or 320 cc head. I found where someone did some work on those and got them to go a little over 400 cfm. Like I said before there very close to the AFR 357 and when I had a chance to pick these up for $1000 brand new from a boat racer I grabbed them. There probably a little on the small side for the 632 crate motor they come on so any work you do to improve flow will certainly help. Just doing a good valve job, open the throats up, blend everything in and open the push rod area a little I think would see good HP gains maybe 30-40 HP on his 632 since it’s already head limited. A full blown port job by some of of top guys like Foxwell, Chad and many others on this site I’m sure would see some excellent gains. Definitely a head not to overlook if you come across a set for a good price, most people would probably just over look them since there not a top name brand head.

 

They need a bigger valve for a 632 unless it's an RV engine or in a 4x4. That'll probably give you the most bang for the buck. You can port them till the cows come home but airspeed through the valve will be too high, hurt VE. A bigger valve will give you more area and more volume. A 632 eats up induction real fast.
Appreciate the mention.
JMO

 

The head is more than likely not set up for any more the .600 lift or the flow just drops off at that lift, DK, but if they do flow 350 cfm that's good for 700 hp or so, kind depends on you. But with some of this type of head you better have a good head guy look them over real good as the machining might not be spot on, I would go to Jegs or Summit or any other place that have sold this head and read the reviews if you can't find anyone on here to clue you in.

 

OK will do and I will see if i can find anymore info on them.

 

BBF612, I watch some of Eric's videos and find a lot of contradictory info then what is out there, like the SBc Vic Jr seems to be the best usually from him, yet the other porters put it around 5 or 6th place. He also he seems to really play-up the ProMaxx heads, that he even said they used his services for the Project X Sbc heads, and down plays the Flotek heads. Yet on my personal Flotek BBc 290's and SBc 220, our info was quite different than what he advertises and says.

I bought my 290's and the seller actually took $$$ off and through in a free valve job to keep me from going with Eric due to issues he has had and heard. BUT that was like 5 years ago, so maybe he has changed?

 

BBF612, I watch some of Eric's videos and find a lot of contradictory info then what is out there, like the SBc Vic Jr seems to be the best usually from him, yet the other porters put it around 5 or 6th place. He also he seems to really play-up the ProMaxx heads, that he even said they used his services for the Project X Sbc heads, and down plays the Flotek heads. Yet on my personal Flotek BBc 290's and SBc 220, our info was quite different than what he advertises and says.

I bought my 290's and the seller actually took $$$ off and through in a free valve job to keep me from going with Eric due to issues he has had and heard. BUT that was like 5 years ago, so maybe he has changed?

This is an old thread, but you can provide all the information you can to help the OP.

 

I changed post title to port work on Blue Print heads to see if others will chime in

 

I came across a set of these heads brand new from a guy set up with solid roller springs with Ti retainers at a price I couldn't pass up. May throw them on a street 565 in a year or two after I retire. I took some measurements and thought i would share the info.

Intake 358cc 2.30 11/32 stem Exhaust 125cc 1.88 11/32 stem
Bowl width 2.365 102.9% Raised .300 D shaped
Throat 2.037-88.6%
Short side width just before the turn 2.155
Short turn height 2.030
Short turn area CSA 4.37
Push rod pinch width 1.609
Height 2.412
CSA 3.88
Deck looks to be around 3/4" thick
Combustion chamber 119 cc

Advertised flow on Blue Prints website, could not find any flow numbers listed higher then .600
Int. Ex
.100-116 seems high? .100-84
.200-184 .200-130
.300-241 .300-183
.400-291 .400-226
.500-328 .500-260
.600-351 .600-286

I have no idea what head they may be copied after or if it is Blue Prints own deal but they seam to have a modern style chamber like AFR, the short turn and the bowl look to be pretty good.
What do you guys think? Could this head possibly be made to flow over 400 cfm and make good power?

That head was copied off a Brodix BB-2. Then BP made minor changes to avoid legal matters.

 

Why copy the oldest head design?

 

I’m going to guess Blueprint can assemble them and maybe use them across multiple engines, and all the ancillary stuff / time of assembly is within what they already have.

They do tens of millions in business, so no doubt it’s profit driven.

 

You are going to need something over 400 cfm to make 900 hp, maybe up to 450 cfm or so. Your work looks great, nice.