Building HS40
- Thread starter Minitrucker
- Start date
that all depends on the cam you plan on using. can put you in the pall bark.
for example: if you just want to stay with a stock cam ,but still want to rev it little higher and it will when engine is setup correct and do not forget to use a billet rod. the old style stock hs-rods will break.
i would go with the animal retainers and keepers and animal 16 pound spring. all this will give you the correct valve spring setup.
some people in the pass have just shim there springs to make them stifffer,but then you can run into problems too with coil bind or even worse. have your 40+ year old springs just break. not worth going down that path. for little amount of money you can purchase the new parts. i call that cheap insurance..:thumbsup:
i'm not a real big fan on milling alot on a flathead. i would stay away from milling alot and try to concentrate on gaining power different ways and there is alot of ways of getting more power out of a flathead then trying to mill the head.
in my opinion i think milling the head is the least amount of power gain in a flathead engine. something else to think about too. go to youtube and study how the frame travels across the head on a flathead. you can clearly see it needs the space for everything to travel back and forth correct. if you tighten up that air space? kind of like choking it.
not a engine expert......just a gearhead.....
for example: if you just want to stay with a stock cam ,but still want to rev it little higher and it will when engine is setup correct and do not forget to use a billet rod. the old style stock hs-rods will break.
i would go with the animal retainers and keepers and animal 16 pound spring. all this will give you the correct valve spring setup.
some people in the pass have just shim there springs to make them stifffer,but then you can run into problems too with coil bind or even worse. have your 40+ year old springs just break. not worth going down that path. for little amount of money you can purchase the new parts. i call that cheap insurance..:thumbsup:
i'm not a real big fan on milling alot on a flathead. i would stay away from milling alot and try to concentrate on gaining power different ways and there is alot of ways of getting more power out of a flathead then trying to mill the head.
in my opinion i think milling the head is the least amount of power gain in a flathead engine. something else to think about too. go to youtube and study how the frame travels across the head on a flathead. you can clearly see it needs the space for everything to travel back and forth correct. if you tighten up that air space? kind of like choking it.
not a engine expert......just a gearhead.....
Last edited:
Well pulled the clutch cover off last night only to find that my crank is broke flush with motor on clutch side so looks like I’ll be starting with a different motor. I’ve got a 6hp Tecumseh I’ll probably use on it. Plan to at least replace the valve springs maybe a cam depending on price. Where is best place to get the animal springs ?
http://rover.ebay.com/rover/1/711-5...0001&campid=5335845805&icep_item=332407292233
Its shipped super fast nice quality has changeable jets and runs great.
Its shipped super fast nice quality has changeable jets and runs great.
DELRAY
correction on this if you where doing a flathead hs-40 motor. use dynocams retainers for flathead briggs . you have to machine little inner step of to clear the animal spring. this will give you the correct spring height (.800)
left animal and center dynocam
left dynocams and on the right animal retainer
also note on the keepers where the locks are at. I have seen animal's work before,but never seen where the locks where position. here is a picture of animal's that did have the correct height on a hs-40 flathead.
left animal and center dynocam
left dynocams and on the right animal retainer
also note on the keepers where the locks are at. I have seen animal's work before,but never seen where the locks where position. here is a picture of animal's that did have the correct height on a hs-40 flathead.
