Join Date: Dec 2000
Location: Monroe, WA, USA
all push rod's are hardned. i wish you guy's would look that one up, the info is here on the board just search for it.
when you jump to 1.6:1 rocker's you need to check clearnces for the push rod's and the vavle spring's need to beable to handle the lift. you also need to check the clearance on the valve guid to spring at the lift you will have with 1.6:1 rocker's.
here is an example of what happen's with a 1.6:1 rocker and a 1.5: rocker. gross lift on a cam with a 1.5 rocker is say .474" if you put a 1.6 rocker on you will have .503" gross lift. you get approx. a 30% incres in lift with a 1.6 over a 1.5. you will also get a longer duration of the valve beeing open. in other word's a 1.6 rocker will make a cam look bigger then a 1.5.
IMHO i like to use 1.6 rocker's on the exaust vavle's as most head's are a bit weaker on the exaust side. but some people like to use them on the intake side only. other people like them for both. it depend's on the cam and head's and what they flow at the lift involved.
just puting 1.6 rocker's on will not alway's make a motor preform beter. you need to do the math and see if it will help you out first.
you need the lobe lift of your cam, the duration and the flow #'s for the head's you have and see if on paper it will help or hurt you.
i know the mag's like to sa "fast cheep weekend bolt on power" but the fact is it will not alway's help. and can cost you more than you had thought.
to clreance the head's you will need to remove then as drilling and machineing might be needed. the mag's never say that do thay.
to cut down vavle guid's cost's about $30.00, if you strip the head's, if you have them do it add about $30.00 to the cost. you will need new vavle seal's, say depending on the type you have $20.00 to $50.00. to clearance the push rod guid's you will need a tool that cost's about $30.00, or have a machiene shope do it and it will cost you about the same as the tool. you will all so need new head gasket's at about $15.00 each., intake gasket's set $20.00. maybe exuast or header gasket's say about $10.00 to $25.00 depending on what you need. all this plus the cost of the rocker arm's and maybe vavle cover gasket's.
i hope i have not missed anything....and i hope i have given you something to think about before you just theink it is a bolt on upgrade. i have given the worst case idea here as i do not know what you have. IMHO on a 305 i would not do this, i would save my $ and build a 350 and drop it in. and depending on the mileage on the 305, if it is hie milage just wait and build a 350. change's like this to a high mileage motor can kill it!IMHO
yes a hi-torq starter will fit a 305.
[This message has been edited by ilbl8 (edited 04-13-2001).]