73C34me

I am considering steping up to victor jr. heads on my 383. I currently have ported edel. performer rpms but feel that a larger cross section would help the top end. I am concerned about losing the low end for street driving. BTW i have a 4 speed muncie w/ 4:11 r.p. & a good sized cam with victor jr. intake. Any thoughts or experience to share?

Emeightch

I think you should do it and sell me the RPM Performer Heads (I'm in the market)!

MotorHead

I have then and love them, check out the dyno vid in my sig. I wouldn't worry about low end torque, with the the Vic Jr. intake my 406ci made around 450TQ @ 2000RPM

73C34me

Em. I live in lansing, & work near shelby township often. maybe we should talk. p.m. me. jim

big_G

I have them on a 383....jury is still out on them for me, I think the low and mid lift numbers are a little low. I have dropped down a cam size, am now going to try the same cam Motothead is using in his 406. (Comp. Cams XR280). Will dyno it soon.

73C34me

Big G, do you feel the motor is over cammed? too much intake port? not enough compression?

big_G

I feel the 215 cc intake may just be a little too big for a 383...but if the low lift numbers would be better, I think they would be great. The lift numbers above .500 are very good.I talked to Edelbrock for about 20 minutes about these heads, they feel they are more suited towards a 12.5 to 13.5 compression motor. My last cam was a little too big, it was bleeding off too much compression. My c.r. is at 11:1 .

MotorHead

Maybe the Edelbrock guys should look at this dyno graph

Doesn't get much better for the street for a normally asperated small block chevy, maybe I am just lucky with the engine combos I come up with, after all Eldebrock clearly labels them race heads

big_G

No, MotorHead...I think they are ideal for a 406....just maybe a tad too big for a 383...BTW, I don't recall if you did any pocket porting or not....