estesformula87

i have a 350 .060 over stock crank 227 241 cam dual plain intake 600 eddie 3.73 gears th350 tranny car wights in just a shade over 3100lbs right now it has the 416 ho 305 heads on it with all the works (stud pins. dual springs port polish three angle large valves etc..) this thing is a monster off the line and threw the eighth mile one mean low end torque machine i run the quarter consistently in the low 13's the problem is i gab the cars off the line hard hold the lead threw the eighth no sweat but after that the gap is closed fast threw the end of the quarter some times i hold them off long enough somtimes i cant
with the 416 heads i can only make about 4800 to 5000 rpm i also have a set of 461 douple humps ive been told these flow and perform about the same as my worked 416 will is this true? do you think it will help to switch from the 416 to the 461 threw the quarter or not am i wrong in thinking the 461's would allow more rpm and a better 60 to 100 mph time or should i just stick with the 416 tell i can afford some good aftermarket heads.

and yes i do know the 461s dont have the holes for alt and power steering this is not a problem i dont use them any way i run a big cog belt pully (blower style) that all bolts to the water pump and headers thanks for any help

Fast355

iTrader: (2)

I had a set of slightly worked 601 heads on a 350 TBI lower end with a 204/214 cam in it. It made peak HP about 4,500 rpm, but would hold in there until about 5,500 rpm before the HP really fell off. 4,800-5,000 rpm sounds like you either have a valve spring or maybe ignition control module issue. If you are running a factory large cap HEI the spark energy goes south quickly above 4,500 rpm. I would also recomeend ditching the 600 edelbrock and go for a 750 cfm Quick Fuel style Holley if track times are important. Also what are you using for a fuel system, if the stock system and mechanical pump, there is a good chance you are running out of fuel on the top-end.

Vortecs + Performer RPM intake

Night rider327

iTrader: (13)

Yeah I don't really see much to gain with that swap. Both heads are around 165cc intake ports.

Ported 416's will flow in the 220-230 cfm range, the stock 461's flows 210-220 range.

Sounds like a wash to me. If you worked the 461's you might pick up 15-25 cfm, get the runner volume up to maybe 173-175cc and maybe pick up 500-800 rpm out of them but at that point with all the time and money put into them it would have been better and cheaper to buy aftermarket heads.

novaderrik

the proper answer to your question is "Vortec". the good 305 heads of the 80's are about equal to the legendary "camel backs" of the 60's, and the vortecs are about 10 steps above either of them..

estesformula87

everything is brand new ive triple checked it all so i would almost promise it cant me sping or valve. i have a full ignition msd box no rev control mallory hei dizzy with vacum advance unhooked (motor hates the vacumm advance very much) taylor wires i tryed a 750 on was way to rich but i do run stock man fuel pump and was told buy some already that i may be runnig out of fuel at high rpm and speeds because of this i just figured it would miss running low on fuel or lean out the plugs really bad? wich it does not but humm this does make since tho

estesformula87

thats what i was kinda thinking and didnt wanna waste money that can be put somewhere else so with all extensive work done on my 416 they should out flow the factory 461 already right now and aftermarket are the goal i just have to hold off a min i got stuck hard on my last build was way miss matched and spent fifteen hundred on the rhs heads for them and they are big 76cc that motor has no low end at lol big ten thousand dollar paper waight in corner of my shop lol

estesformula87

i was waiting for the vortec guys lol all tho i agree very much that no 305 or 350 factory head is better then the vortics flow where im from they go for there weight in gold (mid missouri) i mean every one wants them buy time you get a set of vortects if you can find them (most are tbi or tpi heads of the eighty's and early nintys being passed off as vortects) here and get a intake to match i could pick up a set of iron darts or so forth

i fell like the first response about the fuel might be on to somthing here any one else support this

estesformula87

i seem to have made kind of i large mistake in my postings on here i was looking threw the papers of the machine work and i was wrong i do not have 416 305 heads i have the 601 im very sorry about that