What do yall think the HP on this engine is

[Guest Night_rider_383]

My desk top dyno messed up and i wanted to see what yall think the horsepower and torque on this engine would be. Heres the specs.

 

355 c.i.d

4.030'' X 3.48''

9.35:1 compression .030'' over hypereutectic pistons

double roller timing chain

crane power max 272/284, 216/228@.050'', .454''/.512'' lift hyd cam.

896 castings 1962 327 iron power pak heads

enlarged valves to 1.94/1.50's and i think they are 60 cc's but aint 100% sure

manley 1 pc. stainless performance 1.94/1.50 valves

port work on the bowls, exhaut ports, and intake runners

4.166'' X.041'' head gaskets

k-motion 115 lbs valve springs

crane 1.5 roller rockers

summit hei dist. with a 48,000 volt coil

with the 60 cc heads total compression should be about 10.52:1

 

Any good guess would be a big help.

[DavyZ]

375? Probably low, but better to err on the conservative side and be pleasantly surprised.

 

Davy

[Guest Anonymous]

330 at the flywheel...

 

heh

[pparaska]

If you can get me flow numbers for those heads, I'd be glad to run it through DD2000 tonight. I'd say 350-400 flywheel HP, not sure. I think the 375 guess is pretty good.

[Guest Anonymous]

I'll say 376.. I've seen the price is right before...

 

Regards,

 

Lone

 

Ps seriously though, between 375-400 is probably a real good guess. Not a bad result at all for a moderate 350.

[DavyZ]

Trying to "one-up" me, eh Lone?

 

Davy

[Lone Star 1]

I'm going to to say 331 just in case.

[fl327]

i say minimum 300hp to the wheels, and whatever that is 300+300*.15, and pretty dang tough....

[Guest Night_rider_383]

Thank's yall. Yeah i was thinking along the same lines like 350-400 hp, but for a $1841.00 build from chrome air cleaner down to oil pan, plugs and wires, dress up kit,machine work, etc that aint bad at all. Pparaska i wish i could get you the flow numbers but i have no clue where to find printed numbers on these heads and i dont have a flow bench in my shop. I guess i could make a trip to a speed shop that has a bench but thats alot of money and what we are tryin to do is me and dad build him a car that will last for everyday use, hit high 11's low 12's, get 18 mpg or better and all for under $3500.00. I'm doing most of the work for him and he's footin the bill and his buget for this is 3500.

[Guest Anonymous]

Thats a pretty good price on that motor. It cost that much just to dress out a stock 350 pretty much. Sounds like a nice stout street engine from the specs. Should be fun.

 

Regards,

 

Lone

[Kevin Shasteen]

quote:

---

Originally posted by Night_rider_383:

...9.35:1 compression .030'' over hypereutectic pistons..,with the 60 cc heads total compression should be about 10.52:1..,Any good guess would be a big help.

---

 

Night Rider,

 

How did you determine your 9.35:1 Comp.Ratio?

If your engine hasnt been machined in anyway then your 60cc cyl.heads (using .030 350SBC pistons) would yield 11.4:1 w/your choice of head gasket providing your piston's had a .060cc dish!

 

If you chose that same set up w/.060cc Dish Pistons and 70cc Cyl.Heads...then comp.ratio would be in the 10.1:1 to 10.2:1 Comp.Ratio.

 

If this is a street engine...be careful of your cyl.head selection. Dont guess when it comes to Comp.Ratio's. Remember you have to consider:

 

1) Cyl.Displacement cc's

2) Cyl.Head Combustion Chamber cc's

3) Head Gasket Crush (.041 on yours)

4) Piston Dish or Pisto Dome/Flat Top cc's

5) Piston Comp Ring cc's (Top Piston Ring)

 

Then the "X" factor...your camshaft, as it will effect Dynamic Comp.Ratio.

 

Providing you've made the needed checks/balances for Static Comp.Ratio your engine sounds like it will be very stout! I too would guess in the 350 to 400hp range.

 

Kevin,

(Yea,Still an Inliner)

[Guest Night_rider_383]

Kevin... The 9.35:1 with 64 cc heads came from summits catalog and yes i know this is just a baseline number cause alot can change compression. From what i get when you see a compression on pistons in like summit its calculated with .030'' over pistons, 64 cc heads, stock deck height etc. etc. But the pistons is sterling hypereutectic flat tops i would say -3 to 4 cc valve reliefs. Oh i would like to add this aint gonna be a pure drag car, more or less daily use with alittle strip time, This is for my dad and heres the 3 cars he's thinking about datsun 280 z, 86 mazda rx 7, or 85 ford ranger, the rx-7 will have a 3.91 gear, the ranger will be a 3.73, His pick for a trans is a t-5 5 speed man. out of a mid to late 80's camaro/firebird, max rpm it will ever be turned up too will be about 58-6000.

[Kevin Shasteen]

Night Rider,

 

BTW; your first post mentioned 60cc cyl.heads while your last posting mentions 64cc cyl.heads.

 

64cc cyl.heads will leave you w/a 10.3:1 to a 10.4:1 Comp.Ratio. If you're using alluminum cyl.heads you should be okay, but, if you're using iron cyl.heads you might be pushing the pump gas factor a little too much (detonation?).

 

Unless the piston mfg has altered the Piston Compl.Height your static comp.ratio w/you choice of piston indicates 10.35:1; a 350SBC has a piston comp.height of 1.560".

 

Were those 3 to 4cc valve reliefs (eye brow reliefs) only one relief per valve or were there two valve reliefs for each valve...could make a sizeable difference!

 

Is each valve relief 3 or 4 cc's or is the 3 or 4cc's a total?

 

Kevin,

(Yea,Still an Inliner)

[Guest Night_rider_383]

Kevin... summit list piston compression ratio with 64 cc heads thats where the 9.35:1 and 64 cc heads came from where i'm gonna be using 327 powerpak heads 60 cc. I know this will have my c/r at an almost to much for iron heads and 93 octane fuel, but i think i can play that by. The pistons has one high lift deep valve relief per valve. The -3 to 4 cc is total per piston