Or at least up to 96.
Ran an L88 in both stock form and in modified ( detuned) form. I'd chose an MJ467 over either. Why? In either case, the TQ peak is up there, I;d guess 5000+ for the L88 and jsut under for the LS7. I prefer it to be at 4000.
Therefore , if between the two, I'd build the LS7. Its still a 7000 rpm mill, but you might find a better, more useable TQ curve w/o the need for a 4500+ stall converter.
Shifting at 7200 is DARN fun! * even 6800 with the "detuned" L88.
EITHER will require a VERY GOOD balance job, the 454's being slightly trickier with the ext counterweight, so the flywheel and/or flexplate have to be included.
PS if you give your parts to a true BBC guru like Mark Jones for machining/assembly, the results will be even more spectacular.
I must side with this opinion..
streetable horses have more value to me than "only" raceable horses.. So i want many horses, but down low, early..
Just for fun i compared the MJ496 to the RPO LS7 (with crane ZL1/LS7-replacement cam)...
And if i would have to find words to describe the difference, i would say the MJ496 is the "street-LS7"
--> +10% cubes, -10% compression, -10% cam duration.. everything else all same... even the cam "character" (= lift/duration split & LSA)
... Well and maybe +10% more power than a well tuned LS7.
--> Oval instead of rect port = more low end velocity/torque.
--> & Hyd. Roller instead of Solid Flat Tappet = Less maintenance
--> internal instead of external balancing = easier balancing job
So i would always adjust my build towards this direction. Meaning LS7 over L88 over L78 etc.. above all that a well done 496
|GM Crate RPO LS7 3965774||MJ 496||Numerical main differences|
|CID||454 (7.4l)||496 (8.2l)||42 Ci (+9,3%)|
|Compr. Ratio||12.25:1||9.75:1||2.5 points (- ~10% Hp)|
|Cam||Solid Flat||Hyd. Roller|
|Timing Adv.||318/330*²||284/294||Diff: -34/-36|
|Timing @.50||262/272*²||238/248||Diff: -24/-24|
|*= Crane Fac. Repl. 131141|
|²= ZL1/LS7 OEM Cam 3959180:|