[Crossbar]

In the middle of putting together a bbc 540 f3r 139 injected alcohol motor and to save some cash for now iam going to stay with the set of BB-2x that i have. Iam going to have to upgrade the springs and valves but was wondering if need to upgrade to shafts or will a good set of rockers with a girdle be good enough. This motor is going in a 10.5 car but iam not looking (for now) to set the world on fire just get me to the bottom half of 7's in the 1/4.

 

[Blownbird]

In the middle of putting together a bbc 540 f3r 139 injected alcohol motor and to save some cash for now iam going to stay with the set of BB-2x that i have. Iam going to have to upgrade the springs and valves but was wondering if need to upgrade to shafts or will a good set of rockers with a girdle be good enough. This motor is going in a 10.5 car but iam not looking (for now) to set the world on fire just get me to the bottom half of 7's in the 1/4.

Don't take this the wrong way, but if you are planning to run the bottom half of the 7's, and your budget won't allow you to buy a shaft setup, you should re-evaluate these plans. The maintenance and upkeep on a vehicle of this calibre is extensive and expensive! Don't get me wrong, it can probably be done, but it is still going to take a big budget to run your program.
Just a poor boys .02
DonB.

 

[SHAWN DAVIS]

Not a must
I ran 7 teens with some crower rockers for many years on some bowtie heads and never had any problem. 14-71 blown bbc
probably not the best for precise valve actuation but they will get the job done

 

[Crossbar]

Your know your right, i have been preaching do it once. Shaft rockers are not going to break the bank and at the end of the day i will have a more confidence that wont fail. Now saying that How much of an upgrade would changing to dart 360 or BMF's be. Iam going to stay coventional since i do have a brand new set of headers already made for the car. I suppose saving some money not changing heads is better than cutting corners on suspect componets. Well thanks for the refocus, time to remake the parts list and get back at it.

 

[redcam622]

i have had a few friends lose jessel rockers to failure in the past...but have run comp stainless rockers and girdles on alot of motors that spin well past 8k..and never had a failure...not saying they're better...but they work fine.

 

[SHAWN DAVIS]

In about 10 years I broke one stud mount, have broken several jesel, [email protected] and alan johnson in the years since. which ones really better??? course rpms went from 8300 to 9300 also

 

[Crossbar]

Thanks for the input guys not sure iam not more undecided than i was but the real world experiences sure do help.

 

[dennysavage]

Your know your right, i have been preaching do it once. Shaft rockers are not going to break the bank and at the end of the day i will have a more confidence that wont fail. Now saying that How much of an upgrade would changing to dart 360 or BMF's be. Iam going to stay coventional since i do have a brand new set of headers already made for the car. I suppose saving some money not changing heads is better than cutting corners on suspect componets. Well thanks for the refocus, time to remake the parts list and get back at it.

Give the BB2X's a chance..... We made 1620RWHP, with a 522 BBC, and that head, with a 131, and Blowthru Carb... At 29lbs boost..
XBlowThruDawg

 

[Crossbar]

Dam thats some stout #'s if i get close to those it will be enough make sure i bring a couple spare pairs of ginch to track for the first couple weekends.

 

[the.metal.man]

The only reason you would "need" jesel rockers is if you have alot of offset in the rocker arms. Until you absolutely have to have jesel's, save the cash and use what you have.

 

[shawn69nova]

Give the BB2X's a chance..... We made 1620RWHP, with a 522 BBC, and that head, with a 131, and Blowthru Carb... At 29lbs boost..
XBlowThruDawg

was that alky? just wonderin what fuel. those r real big numbers