chy20k1

will i see any gains that would be reason enough to use 1.7 rockers with the hot cam?

Fast Caddie

I read over on one of the vette forums a fella with an LT1 vette and hotcam kit changed out the 1.6s for 1.7s and gained another 15rwhp... has dyno sheets to prove it too. I'd venture to say you could gain upwards of 20rwhp with them on the stock cam.

drewstealth

yes i would try them out on the hotcam. I'm gonna try some 1.7rr's on my stock cam. I just wanna see what kind of power i can get as a bolt on car. Well sort of still a bolt on. Unless you count poping off the valve covers as an internal mod.

brain

Drew - I just saw this post, after the one you had about getting dyno'd with LT today. Do you have the 1.7s yet? If not, when do you plan on getting them? I am in the middle of putting mine on right now. I will let you know what it does on the dyno this weekend hopefully. I'm shooting for 330 rwhp with bolt-ons.

Fast Caddie

Lift with stock cam and 1.5s: .447 int/ .459 exh
1.6s: .477/.490
1.7s: .507/.520

That's a pretty substantial increase in lift.... almost hotcam territory. From some of the results i've seen on here from 1.6s (10-15rwhp), i'd say the 1.7s have the potential to hit 20rwhp. Might even help fatten up the torque curve in the higher rpms since the stock cam's lack of duration and overlap choke it.

Who knows, an M6 with LTs, CAI, cutout, electric WP, and 1.7s might hit 320rwhp with a good tune.

As for the hotcam:

lift with 1.6s: .525/.525
1.7s: .558/.558

Might bump you up to 340rwhp or so.

I wanted to get these with LT4 springs this summer (can get everything needed for under $300, including the rockers, GPs, seals, etc). But current budget shows that i probably better not

disco192

I know a guy thats running mid 10 in a bolt on LS1. That is if you consider the 200 shot that he bolted on. Im just playing, lol.

Cams, cranks, rods, pistons, and heads are internal. Everything else minus nitrous is bolt on IMO.

hvyss

what kind of lift will you get with the 230/236 XE cam? On 1.6 rockers I have .544/.555. My AFR heads have Comp Cams .650 lift valve springs. Will they work?
HVY SS

speedmiser

I think you can get the lift with 1.7s by dividing the your 1.6 lift by 1.6, then multiplying by 1.7, which gives .578/.589

Someone correct me if I'm wrong though.

Somnambulist

I'm assuming you have to take emissions into consideration...because otherwise it would be better to go with a larger lift cam and 1.5 or 1.6 rocker ratios to equal an equivalent to a hotcam and 1.7 rockers...it's better on your valvetrain...

chy20k1

you got the formula right but you multiplied wrong or you were thinking of the wrong cam. 525/ 1.6 = 328 328 * 1.7 = 557

speedmiser

The numbers I gave are correct for hvyss. I was answering his question about the lift on CC XE cam he mentioned, not the hotcam. He gave .544/.555 with 1.6s

BiGGinZ

Would it be possible to pass emissions (Cali) with the hotcam and 1.7's? I know with the hotcam you can but with the 1.7's too? That is the set-up I wanted to do.

scoobysnax83

where are you guys finding these 1.7s?

KillinFormula

I have the LT4 hot cam kit on my car, what would i need to change to be good to run the 1.7s or can i just put them on and not have to worry?

scoobysnax83

nothing else needed, just a good tune afterwards to fully utilize them