400 Power?
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400 Power?
i just got a 77 highboy with a 400 in it and i have the reciepts on the motor and i was curious about what kind of hp it has.....crane 1.7 roller rockers, high comp. pistons, heads milled .040, deck milled .040, performer intake, headers and 600 holley.............and i'm not sure about the cam because no part # on the reciept........i was also gonna get a new carb,any suggestions on what should come next?
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From: KC Metro
400 Power?
As of right now, we are missing two of the most vital parts of your engine to determine your power.
Your compression ratio is important, if its a 400 bored .030 over, it probably has a set of 9:1 flattops in it, so its more than likely a safe bet to type that into your dyno.
Then your cam, it is basically impossible to tell you what you have without knowing the numbers of your cam, because the cam can be the deciding factor between having 475 ft/lbs of torque at 2000 rpm, or having 435 hp at 3700 rpms. Becuase there are just so many options for it.
sorry.
-Daniel
Your compression ratio is important, if its a 400 bored .030 over, it probably has a set of 9:1 flattops in it, so its more than likely a safe bet to type that into your dyno.
Then your cam, it is basically impossible to tell you what you have without knowing the numbers of your cam, because the cam can be the deciding factor between having 475 ft/lbs of torque at 2000 rpm, or having 435 hp at 3700 rpms. Becuase there are just so many options for it.
sorry.
-Daniel
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From: Jax FL
400 Power?
ok there is a lot here that has me concerned
stock c r is 8/8.4
you are stating that you have high cr piston then took .040 off block and heads, for a total of .080. now the gasket size will fill in some of that but you are looking at a 10.5-11.5 cr.
i will need to know the chamber size of the heads since they were milled.
with just the block milling and stock pistons/gasket you are about 9.0 cr. with flat tops its 9.7-9.8.
if i guess on the head size at 68cc its a 10.8cr. at 72cc its 10.36
also i would need the type of cam, as well as the cam specs. i also needthe gasket thickness.
stock c r is 8/8.4
you are stating that you have high cr piston then took .040 off block and heads, for a total of .080. now the gasket size will fill in some of that but you are looking at a 10.5-11.5 cr.
i will need to know the chamber size of the heads since they were milled.
with just the block milling and stock pistons/gasket you are about 9.0 cr. with flat tops its 9.7-9.8.
if i guess on the head size at 68cc its a 10.8cr. at 72cc its 10.36
also i would need the type of cam, as well as the cam specs. i also needthe gasket thickness.
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400 Power?
well here's the deal on the cam .........the cam that was put in it by the guy who built the engine is sittin next me me.........the guy who i got the truck from put a different cam in it because of milage.....why he built the engine the way he did and then to change cams because of gas i don't know......but i did find that is a lunati and has some numbers stamped on each end.....it's has a .......98.....0281 s which the 0281 is cast into the cam in another place also...5 300........1828.........and on the other end is has....11101.......112.......e32d......f.......
i'm startin to think it's to much of a pain to figure it out.....i should just put this cam in it and drive the hell out of it........
and i talked to the guy who i bought the truck from and he said it was either 10:1 or 11:1 comp........i know that anything less than 92 oct you get some serious spark knock...
the pistons are TRW i think....if that helps
i'm startin to think it's to much of a pain to figure it out.....i should just put this cam in it and drive the hell out of it........
and i talked to the guy who i bought the truck from and he said it was either 10:1 or 11:1 comp........i know that anything less than 92 oct you get some serious spark knock...
the pistons are TRW i think....if that helps
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400 Power?
The Lunati 11101 cam is a 351C 4V cam, loosely based on the 351C HO solid cam, but the Lunati is hydraulic. Duration is a bit longish (219/229 @ 0.050"), with single-pattern lift (0.505" on both lobes). It might be ok, but I wouldn't use it in a 400. I'd rather have just a few degrees less duration on both intake and exhaust, and more lift on the exhaust.
The TRW pistons are not high compression (unless you started with the ultra-low-compression, late model 7.3:1 car pistons). They have a 12 cc dish and reduced compression height of 1.630". Advertised CR is 8.33:1 with 76.2 cc heads, 8.19:1 with 78.4 cc heads.
If your numbers are correct for the deck and head milling, the TRW pistons would give about 9.5:1 CR.
The TRW pistons are not high compression (unless you started with the ultra-low-compression, late model 7.3:1 car pistons). They have a 12 cc dish and reduced compression height of 1.630". Advertised CR is 8.33:1 with 76.2 cc heads, 8.19:1 with 78.4 cc heads.
If your numbers are correct for the deck and head milling, the TRW pistons would give about 9.5:1 CR.
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From: Jax FL
400 Power?
ok so i can make 3 runs with diff cr's. bubba dont forget that it has .040 off the heads. with the heads smaller than stock the cr will go up as well.
i am at work now, will post when i get home
i am at work now, will post when i get home
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From: (near) Denver USA
400 Power?
With the 2V heads, the first 0.050" or so that you shave from the head reduces clearance volume by about the same amount as cutting the deck. So I figured the head and deck milling by just subtracting the entire 0.080" from deck height. With my spreadsheet, that effectively deals with the chamber difference.
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From: Jax FL
400 Power?
not as much as i was thinking for a solid cam
600 carb
380hp @ 5k 466tq @ 2k-4k 9.5:1 cr
390hp @ 5k 474tq @ 2k-4k 10:1 cr
408hp @ 5k 490tq @ 2k-3.5K 11:1 cr
650 carb
384hp @ 5k 468tq @ 2k-4k 9.5:1 cr
395hp @ 5k 476tq @ 2k-3.5k 10:1 cr
410hp @ 5k 494tq @ 2k-3.5K 11:1 cr
thanks bubba for the cr and cam info.
77, its all good, we are able to figure out a lot of stuff. hope you like the numbers. these are a rough figure, there is slop in here, it is a program after all, but its close.
600 carb
380hp @ 5k 466tq @ 2k-4k 9.5:1 cr
390hp @ 5k 474tq @ 2k-4k 10:1 cr
408hp @ 5k 490tq @ 2k-3.5K 11:1 cr
650 carb
384hp @ 5k 468tq @ 2k-4k 9.5:1 cr
395hp @ 5k 476tq @ 2k-3.5k 10:1 cr
410hp @ 5k 494tq @ 2k-3.5K 11:1 cr
thanks bubba for the cr and cam info.
77, its all good, we are able to figure out a lot of stuff. hope you like the numbers. these are a rough figure, there is slop in here, it is a program after all, but its close.
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400 Power?
well thanks for all the help........but one more question.........what comes next.......ignition.....new carb.......a different cam......you can never have to much hp the way i see it.....but i don't want to spend $1000 for 10 hp.........but i also understand you don't get 500hp with a $100 bill.
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From: Jax FL
400 Power?
well if you want 500 hp, you are gonna spend money. i think a 650 carb would be nice, now going to a single plane intake you will lose about 50 ft # of torque on the bottom end, but you will gain good hp at the peak. more lift in the cam will generate more power, as well as larger valves. right now to get to 500hp, you might be looking at a new rebuild.
an msd box will help you from over revving, you might want to look at the petronix upgrades for the dizzy, as well as having the dizzy recurved.
an msd box will help you from over revving, you might want to look at the petronix upgrades for the dizzy, as well as having the dizzy recurved.
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400 Power?
well i have a set of 40's on it and i just play in the mud......maybe swap tires and pull it at the fair.........so shouldn't i shoot for more tq than hp?......the motor only has about 25k or 30k on it......maybe i just break down someday and buy new heads for it someday