CCFBG - View topic - Is this too big for the street?

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Is this too big for the street?

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Daz CCFBG Club Member Joined: Sat Mar 19, 2005 8:15 am Posts: 3233 Location: Mississauga	Is this too big for the street? with a 9-9.4:1 compression 468? Quote: We have custom designed a head to meet the demands of the BBC world, while keeping the quality high and the price reasonable. Our BBC heads come as cast with a 320cc intake runner, US made bronze guides, and our 5 angle valve job. Chevy High Performance used these to build their 675 hp 496 in their Jan. 2008 issue. These heads are equipped with a 119cc chamber, assembled in our facility with 21-4N stainless 2.250" / 1.880" valves, .700" solid roller springs (for serious street / strip applications), Titanium retainers, 7/16" studs, guide plates, machined locks, and viton seals. Sold as Pair. Technical Specs: Combustion Chamber: 119cc Intake Runner: 320cc Exhaust Runner: cc Intake Valve: 2.250" Exhaust Valve: 1.880" Max. Valve Spring Lift: 0.700" Spring Pressure Closed: 225 lbs. @ 2.000" Spring Pressure Open: 600 lbs @ 1.300" Retainer Material: Titanium Valve Seal Material: Viton Valve Guide Material: Manganese Bronze Valve Job: 5-angle Weight 91.00 lbs This can be milled to about 115 and it will be used with a hydraulic roller in the 240 duration range(half lift) Rotating assembly are all forged with good bolts. Im debating between two heads 119cc head Pros - flow better,match the intake, half price(not this is not a Pro-Comp head) Cons - might be too big,lower compression 110cc head Pros - good compression,popular brand Cons - cost,flow numbers just a bit better if not the same as ported 781/049 heads Both have about the same internet reputation when it comes to quality with a slight advantage with the 119cc head. Both will be thoroughly gone through before assembly I dont have cam/lifters picked out yet but it will match the head provided it will have enough vacuum for power brakes without locking or advancing the timing too much.
Tue Oct 05, 2010 6:28 am

wildgooseperformance Junior Forum User Joined: Sat Dec 06, 2008 9:21 pm Posts: 41 Location: Stoney Creek	BBC heads The valve springs on the 119 heads are too much for a hydraulic roller. You don't need titanium retainers on the street, with dual springs they will get chewed up over time. You want the smallest runner volume with the highest flow for street applications. You are looking for torque on the street not top end HP. If the compression is closer to 9:1 drop the duration down in the 230's. Run high lift short duration, this way you can take advantage of the high lift flow numbers but still have vacuum for the brakes... _________________ "If you're gonna goose it Wildgoose it"
Tue Oct 05, 2010 10:20 am

Daz CCFBG Club Member Joined: Sat Mar 19, 2005 8:15 am Posts: 3233 Location: Mississauga	Re: BBC heads wildgooseperformance wrote: The valve springs on the 119 heads are too much for a hydraulic roller. You don't need titanium retainers on the street, with dual springs they will get chewed up over time. You want the smallest runner volume with the highest flow for street applications. You are looking for torque on the street not top end HP. If the compression is closer to 9:1 drop the duration down in the 230's. Run high lift short duration, this way you can take advantage of the high lift flow numbers but still have vacuum for the brakes... Thats why Im leaning towards a hydraulic roller or even a solid roller even though its costly. Here are the Flow Numbers: Lift Intake Exhaust- .100 86.6 63.6 .200 177.5 148 .300 252.3 192.1 .400 295 231.7 .500 329.6 256.8 .600 359.1 268.9 .700 368.2 275.1 I imagine is a bit inflated but I think a little torque loss shouldnt be too bad compared to heads with smaller runner..The runner that Im comparing it to has 290cc runner as opposed to 320 on this one
Tue Oct 05, 2010 11:21 am

wildgooseperformance Junior Forum User Joined: Sat Dec 06, 2008 9:21 pm Posts: 41 Location: Stoney Creek	BBC heads The smaller chamber head may flow less but it will make more compression, it may be a toss-up. Who makes these heads. The only companies we have found don't inflate their numbers are AFR, Brodix. Most others are inflated even Edelbrock.. _________________ "If you're gonna goose it Wildgoose it"
Tue Oct 05, 2010 12:24 pm

Mr Bastard CCFBG Club Member Joined: Sat Mar 19, 2005 8:07 pm Posts: 4327 Location: The big town	thats why i run oval ports on my street engine, velocity....i don't drive most the time at 7000 rpm where a lot of square ports shine....now on the big monster i run bb2 extra because most its use is WOT! and a lot of cubes to feed. _________________ 9.06@155 mph, small block pump gas with 3.42's bird 8.14@166 mph, big block on 250 shot monza
Wed Oct 06, 2010 4:55 pm

Daz CCFBG Club Member Joined: Sat Mar 19, 2005 8:15 am Posts: 3233 Location: Mississauga	Mr Bastard wrote: thats why i run oval ports on my street engine, velocity....i don't drive most the time at 7000 rpm where a lot of square ports shine....now on the big monster i run bb2 extra because most its use is WOT! and a lot of cubes to feed. I made a mistake on the bottom end but in the future it will be 555+. I dont think it will be too much of a dog on the street though. What do you think?
Wed Oct 06, 2010 5:07 pm

Daz CCFBG Club Member Joined: Sat Mar 19, 2005 8:15 am Posts: 3233 Location: Mississauga	Re: BBC heads wildgooseperformance wrote: The smaller chamber head may flow less but it will make more compression, it may be a toss-up. Who makes these heads. The only companies we have found don't inflate their numbers are AFR, Brodix. Most others are inflated even Edelbrock.. Patriot
Tue Oct 26, 2010 4:38 am

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Is this too big for the street?

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