I got a set of 416 heads off a 305, following the port and polish article on here, would they work on a 350 to increase compression or would it be a waste of time, and a other wise stock L98?

 

EDIT- i was not aware that 416 heads had 165 cc.. but if you have um laying around y not. sorry.. i have had bad ex with 305 heads on 350's

 

That is a fairy tale, the 416 heads have a 165cc intake runner, that is bigger then most 350 heads. This guy obviously doesn't know what he is talking about, a smaller runner will give you more low end power, due to the increased velocity.

 

Thats what i had always thought.

Smaller runner = more low end, at the expense of top end support
bigger runner =more top end, at the expense of low end velocity

I have 416s that ive massaged out a tad. on my engine. They work fine. They benifit from 350 sized valves, however. 1.94/1.6 are what i used. used Sitting Bulls thread as a guideline. i was pleased with the results...granted i am yet to run with them.

I say go for it.

 

ok well it will be a while before i put them on, as I just got the car running fine, and i have no money to get the valve train for them? thou i have a dremel and some grinding wheels so i will give it a go.

 

You will want carbide cutters. I'm sure grinding wheels would work, but time isn't going to stop and wait.

I have a dremel, but opted to use a die grinder with variable speed control. I was glad i did. At that, i prefer the 1/4" shank of the die grinder over the 1/8" of the dremel. Also, i have never seen a 6" carbide of any tip shape, with a 1/8" shank diameter. And those 6" cutters work really nice for the deep port work.

 

Your not going to get anywhere fast with a dremel.

 

Mine worked dynamite. good power to 7000rpm, fully ported with 1.94 x1.60 valves.
I got a little carried away with the compression ratio.
It was 12.65:1. Make yours around 10:1.
Good go for the $doe$.
Got to ask thou, Y not just soup up the L-98 heads?

 

Hey Russ,

Have you gotten through the quarter yet this year with the 416s on your 350? I know your engine grenaded last year and am wondering if you have a current ET?

 

Someone help me out here. Wouldnt #416s have different intake bolt angles than #083 TPI heads?

 

No I haven't. Been too busy working, and playing with the new 406. the 350 is on the engine stand and will be coming apart soon. may need a sleeve.
one head was destroyed. But would like to get it back together again. was a blast to drive. easy 12's.

May slide the 350 into somthing real light like a 79-84 RX7 with a lil NOS.... Can u say 10's for $2000?
looking for one of these.....and 1 more Cheater NOS plate

 

Thats funny, look what I actually found tonight looking for some parts I had in the closet...lol

Email me Ill get rid of it soleniods and all pretty cheap. Off of a Cheater system

 

:lala: B-E-A-U -D-E-E !!!

Just what I need for my 1 run fun project RX-7 from HELLLLL!.

 

Because i need the car to drive to work and back, and if my porting skills suck, i don't want to screw up the l98 heads.

 

Hi everyone...in relation with this topic....i just want to know if my 87 305 LG4 head were the same as the 80-86 #416 head....i know that my head is the same as the 305 TPI engine.

 

No, your heads are almost the same but have center bolt valve covers. Other then that they are about the same.