I am putting a new engine together for my bracket car and was wondering what you all think about it and HP estimate and performance.
Stock bodied 69 Chevelle
454 + .030
3994026 rect open cahmber heads 2.25 int 1.94 exh
JE pistons 12.6:1 comp with 118cc
Isky RR-645 roller cam 650 lift 330 dur 274@.050 112* lobe centers
Edlebrock Victor 454R with Holley 850 DP
Turbo 400
10 inch converter
12 bolt 4:56 gears

lobe center too wide 108 or 110!! Ya may have to run it advanced!

I havent got the cam yet do you think i should look for a different grind with 108. Thanks for input

107 or 108 lsa...and duration around 265 @ .050". you can have any cam ground on any LSA. My new motor runs a crower, and i think it costs me $30 more to have it custom ground on a tighter LSA.

I dont like the retangular ports for a low rpm bracket car with a tight converter, look into open chamber oval ports (if you have the pistons already)...or if you havent bought anything find a set of closed ovals.

lobe seperation determines where peak torque will occur within the enignes power range. tight lobe seperations (such as 106) cause the peak torque to build early in the basic rpm range of the cam. the torque will be concentrated, build quickly and peak out. broader lobe seperations (such as 112) allows the torque to be spread over a broader portion of the basic rpm range and shows better power thru the upper rpm range.

this cam would work very well for his combination since the rectangle heads and intake is being used, this is a good combo, but be ready or willing to spin your motor to around 7600 to 7800 rpms to get full use of your parts.......the only down fall i really see is the 10" convertor my not be enough since these are normally around the 3500 stall range for off the shelf units.......a stall around 5000 rpms would be a better choice......wider lobe seperations really make the engine pull hard on the upper end and the torque continues on up the power range compared to the tighter lobes for they seem to peak and fall off quickly.........which in this case it would hurt you....just as you getting into the rpm range of the heads and intake your cam will fall on its face(if you was to run a tighter lobe seperation).......

so you just have to decide......oval ports with a tighter lobe seperation(lower rpm motor) or leave as is and run a looser convertor with the proper gears to match..........

Joe:

This will help you understand the effects of LSA (http://drr.infopop.cc/6/ubb.x?q=Y&a=tpc&s=3476075&f=80760912&m=216601026&p=1)

Thanks for the input guys.