Nothing wrong with compression , just back the timing a couple of degrees. More low end power with slightly less peak power. Just look at it as a boosted engine raises dynamic compression so appropriately pull timing you can run pump gas
According to my DesktopDyno, your 72cc heads with a .054" head gasket (4.040" dia.) and pistons down the bore .010", this engine will have a 9.63:1 compression ratio, with a stock bore with flat top pistons...
You know, you can put those pistons on a mill and take that dome off and not hurt a thing. Will make them a lighter also, maybe put them on a scale and match them and go. See it done many times. I've seen dome pistons in a Big Block milled some and swapped sides and the dome then went up into the open chamber on a 906 head and created a squish area. Not ideal but works on the street.
Dang, tough break on the wiped cam. With that compression, I like a wider lobe separation unless it's a race-only application, and not so staggered intake-to-exhaust, duration wise. A "Thumper" and "Whiplash" (Hughes) cam designed for "sound" are great in low compression engines (building cylinder pressure), but with your pistons, you could use a straight-pattern cam like the old .484" or if enough gear with that 4spd, a .508" Purple Shaft, would work better. I like the slightly (7* split) staggered "Purple Plus" series from Comp Cams even better than the originals, they make a .474,.484, and .508" all with modern lobes specific to MoPar (.904" lifter diameter minimum). A Howards "Rattler" is a 109LSA and they have 3 different levels. I'm just not a fan of Thumprs, unless you have a low compression engine and want to turn heads more than take it to the track. Thanks for posting, and good luck!! RB
According to my DesktopDyno, your 360 will make about 376hp@6000 before it drops and 375ft.lbs.@4500 with an 800cfm 4bbl. I think these numbers are shallow. I've got other cams here doing better on this thing. That is installed at a 101.5 Intake Centerline where the intake closes at 39* ABDC to get it streetable.
It should be reasonable. It should turn over will a little bit of effort. Generally after installing each piston, I’ll turn it over to make sure there is no binding, and if there is, I know which one caused the problem.
Nothing wrong with compression , just back the timing a couple of degrees. More low end power with slightly less peak power. Just look at it as a boosted engine raises dynamic compression so appropriately pull timing you can run pump gas
According to my DesktopDyno, your 72cc heads with a .054" head gasket (4.040" dia.) and pistons down the bore .010", this engine will have a 9.63:1 compression ratio, with a stock bore with flat top pistons...
You know, you can put those pistons on a mill and take that dome off and not hurt a thing. Will make them a lighter also, maybe put them on a scale and match them and go. See it done many times. I've seen dome pistons in a Big Block milled some and swapped sides and the dome then went up into the open chamber on a 906 head and created a squish area. Not ideal but works on the street.
Dang, tough break on the wiped cam. With that compression, I like a wider lobe separation unless it's a race-only application, and not so staggered intake-to-exhaust, duration wise. A "Thumper" and "Whiplash" (Hughes) cam designed for "sound" are great in low compression engines (building cylinder pressure), but with your pistons, you could use a straight-pattern cam like the old .484" or if enough gear with that 4spd, a .508" Purple Shaft, would work better. I like the slightly (7* split) staggered "Purple Plus" series from Comp Cams even better than the originals, they make a .474,.484, and .508" all with modern lobes specific to MoPar (.904" lifter diameter minimum). A Howards "Rattler" is a 109LSA and they have 3 different levels. I'm just not a fan of Thumprs, unless you have a low compression engine and want to turn heads more than take it to the track. Thanks for posting, and good luck!! RB
According to my DesktopDyno, your 360 will make about 376hp@6000 before it drops and 375ft.lbs.@4500 with an 800cfm 4bbl. I think these numbers are shallow. I've got other cams here doing better on this thing. That is installed at a 101.5 Intake Centerline where the intake closes at 39* ABDC to get it streetable.
Subbed.
Thanks. I’ll be adding more videos shortly on the build
Should the engine be tight to turn over by hand after fitting new pistons
It should be reasonable. It should turn over will a little bit of effort. Generally after installing each piston, I’ll turn it over to make sure there is no binding, and if there is, I know which one caused the problem.
@@agatemaster5706 it'seems to be tight in the bores,the have been bored out and honed
@@iantooth3064 what’s your ring gap?
@@agatemaster5706 just checked the gap,it's 15 thou.