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Wed Nov 19, 2008 9:45 pm

ok i did a search im getting ready to build a wild 1600 or 1641 havent decided that yet ill be running fly/hemi cut type 3 heads built by roy martin stock crank stock rods as41 0 deck height dpr case engle 110 straight cut scat cam gears big face lifters chrome moly push rods my compresion will be set around 8:1

my question is what rocker should i go with

Wed Nov 19, 2008 10:22 pm

with that cam, your options are stock or 1.25's

Thu Nov 20, 2008 1:26 am

Thats a lot of cam in a pretty stock engine, all your doing is taking power from the bottom end and adding to the top, in a heavy squareback it better to have the low end TQ, I would have gone with a CB cheater cam.

Stay 1600 for thick barrel reliability.

CB sell some nice 1.25 rockers.

I hope you know the timing you need to run with semi hemi heads.

Thu Nov 20, 2008 8:54 am

it wont be going into a sqb honestly im nost sure where this engine is going its probably going to end up in a 1 seater rail

and whats this about special timing with the hemi heads i dont know any thing about that

it wil more than likely have dual 34s or kadrons

Thu Nov 20, 2008 10:23 am

You can typicly run more timing with a hemi-cut head. hemi-cut = lower compression and that means it can tolerate more timing. I ran 34 deg with a 1776 with stock valve hemi-cuts with no problems. Most people feel hemi-cut heads are from the old way of thinking and not worth useing these days. But if thats what you have then run em.

Thu Nov 20, 2008 10:31 am

i have total faith in the man that built my heads he had been machineing vw and porsche stuff for 30 some odd years he was a firm believer in hemi cut so im nit even worried about that im worried about the rockers im not very experienced with building engines this is my second my first was a bone stock 1600 this is my first that is going to have some speed parts in it

Thu Nov 20, 2008 11:09 am

I'm sure you are getting well built heads. All I was saying is that a lot has changed in 30 years. I'm not saying thay won't work or that thay are bad, Just not as good as you can get for your time or money. It's been said a thousand times on this site "it's all in the combo". 8:1 C/R with hemi cut heads is going to be tough to achieve with out extra machine work on the case or barrels. Hemi cutting the heads adds a lot of combustion chamber volume. Gene Berg hemi cut heads to lower compression. I'm not sure about what a 1600 came with stock but it was around 7.5:1, then putting on high chamber volume hemi-cuts will lower that even more. :shock: Some of the parts you are talking about you don't need. Chromemoly pushrods and straight cut gears are not going to be necessary with the combo you are talking about. Only needed if you have really high valve spring pressures. For rockers Just use stock rockers with heavy duty shafts swivel foot adjusters and read the sticky on rocker geometry and you will be fine. Why not talk to your head builder and have him suggest what you need for your combo?

Thu Nov 20, 2008 11:16 am

because my builder has retired i already have all the parts listed above so why not use them

Thu Nov 20, 2008 12:09 pm

Your going to need help from the cam to gain back the loss of the hemi cut heads and most likely low compression. Hemi cut heads need a hemi dome piston to work effectively.
If it where me I would have the lifter bores sleeved if running a mag case (if aluminum case don't worry about that part) and run a Engle VZ-14 cam with stock rockers (1.1:1) and solid shafts. That cam makes big bottom end torque, and has a very strong mid range in a 1600 engine, you won't be disappointed on road or off road with this cam so it leaves applications open.

Thu Nov 20, 2008 12:18 pm

SRP1 you said the VZ-14 has good low end torque, is the a cam for performance or daily driving? I have only dealt w/3 cams,stock,110,130. the application I am intersted in is a mid size Type 1 to push a bus.

Thu Nov 20, 2008 12:23 pm

babysnakes wrote: SRP1 you said the VZ-14 has good low end torque, is the a cam for performance or daily driving? I have only dealt w/3 cams,stock,110,130. the application I am intersted in is a mid size Type 1 to push a bus.

Mid size type 1 gets the best power band in bus applications from around a webcam 218 with 1.25 rockers or engle 100.

Thu Nov 20, 2008 1:11 pm

thanks krusher, I kinda figured the 100, I've always been skeered to go past 1.1:1 due to lack of experience

Thu Nov 20, 2008 2:56 pm

VZ-14 is a high lift performance cam, high lift at the cam.
For a bus I'm with Krusher, Engle W-100, its easy on lifter bores too.
Rockers are up to you, you will not see a big difference from the 1.1 stock rocker to the 1.25's in a bus, your looking at a .060" valve lift increase moderate, but slight when it comes to feel in the seat.
For longevity, economy, and good torque in a bus I would run a Engle W-100, and stock 1.1:1 rockers on solid shafts.
That's based on a stock stock engine, for a bigger stroke I may step up the cam just a little depending on the final combo. :wink:

Thu Nov 20, 2008 5:29 pm

Well I was considering stock stroke cause I already have a 69 CW crank. I just wanted to increase displacement to 1776-1914. So from what I've read the 100 cam would have the torque i need and keep the temps down. The 1776 seems to be the best choice(I think) due to the thick wall cyl. This site is better than college. But then that was so long ago my memory might be shot.