MILD THUNDER

iTrader: (3)

Yep. Not much to gain there upgrading your 420 with that cam, considering its the SAME cam!!

This cam would be a step up. My buddy runs these in some old 454's.

http://www.summitracing.com/parts/cr...make/chevrolet

northernoffshore

speed service, elston ave, chicago 773-545-1616 brian doss.

cig20

iTrader: (1)

do not know much about building motors as you can see that a idea from another person on what to do what would be a good roller cam to use and would i be better off not using old heads a buying new one
just dont want to break the bank
dont know if exhaust makes a difference but i have aluminum 496 manifilds and risers

FIXX

iTrader: (2)

isky makes a good up graded cam for the 420 merc..has a sharp idle and real responsive...i have used this cam in many engines and it works great..i get the whole cam kit with springs and pushrods retainers shims lifters..the whole ball of wax for under 500 bux..

http://www.iskycams.com/pdfcatalog/2004-05/page162.pdf

cig20

iTrader: (1)

have talked to a couple different places and now im baffled
rebiuld motorand install roller cam complete job with redoning existing heads prices are all over the board from 3500 to 7000 what would be a fair price everyone says they are doing the same thing and a extra 400 to500 to dyno by all

FIXX

iTrader: (2)

5500.00

Shalom

iTrader: (2)

What about trying to price a Dart short block or long block already built from dart?

I see new big block short blocks for around $3500.00 brand new. Add Dart heads and a stick for say another grand and your in it for about $5k..And you have a brand new dart motor? Is this reasonable for him to consider....Sell old motor to recoup some investment...
I just did it with 2 sbc darts and could be happier....(Note: I did use a cast crank because I am only turning 5200....)

FIXX

iTrader: (2)

28 donzi and 406's ?

supercat

don't think you ever mentioned what exhaust you have? you need to be aware in your cam selection or you will see water reversion into your exhaust. Valve overlap needs to be considered. Exhaust will also play a major roll in your final hp numbers with whatever engine setup you choose but even more so as you go up in rpms.

cig20

iTrader: (1)

leaning towards the new motor and selling exiting motor
what is a 454 420 worth ?