1.6 or 1.7 - horsepower difference
#1
1.6 or 1.7 - horsepower difference
alright, so i finally got my 331 in and i'll be transfering the heads from my 289 to it which have 1.6 roller rockers on em. the cam is an XE276HR which says it uses 1.7's to make lift @ .544/.544 - but @ 1.6 its only .512/.512
now i have dyno2003 and i've plugged the numbers in as best as i can and with my combination @ 1.7's it should make
422 hp @ 6000 rpm and 400 tq @ 4500 - i swap the lift down to .512 to negate with the 1.6's and my power only drops to 419 / 399
is this right? 3 horsepower is the only thing i'd gain by having the 1.7's in it? the one reason i dont wanna swap is i just blew the 299.00 on the 1.6's and now that i tore the 289 up i wanted to go beefier but they all suggested the 1.7 cam.. so.. if i'm giving up only 3 hp then i should just forget the 1.7's right? or is there something i'm totally missing here..
now i have dyno2003 and i've plugged the numbers in as best as i can and with my combination @ 1.7's it should make
422 hp @ 6000 rpm and 400 tq @ 4500 - i swap the lift down to .512 to negate with the 1.6's and my power only drops to 419 / 399
is this right? 3 horsepower is the only thing i'd gain by having the 1.7's in it? the one reason i dont wanna swap is i just blew the 299.00 on the 1.6's and now that i tore the 289 up i wanted to go beefier but they all suggested the 1.7 cam.. so.. if i'm giving up only 3 hp then i should just forget the 1.7's right? or is there something i'm totally missing here..
#3
RE: 1.6 or 1.7 - horsepower difference
personally I'd use what cam manufactorer said to use with cam and as for your desk top dyno calculations.. I wouldn't rely on it's plug and play calculations
#5
RE: 1.6 or 1.7 - horsepower difference
i don't rely on the program, just enough to get the gist of it, knowing almost all the dimensions and such of the engine i feel it's close to what it rates it but i don't hold my breath on things like that. i have almost the exacting combination as most other crate engines that are rated at 410hp for a 331 so.. i'll take that too.
just hope it might be enough to hit 12s in this 2800 lb car
just hope it might be enough to hit 12s in this 2800 lb car
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