customblackbird

iTrader: (15)

87 350TPI.... HSR, hot cam, 1.6 rr, stock L98 heads with spring upgrade... underdrive pullies, low temp fan/thermostat, ram air, chip from pcmforless, headman long tubes, custom true dual 3" with xpipe... wat HP figures am i looking at over my portmatched plenum, SLP runners, and stock base with stock L98 cam???? and wat would i be looking at with the new combo at the flywheel?

i kno the heads are killing me but i cant afford great heads yet

Orr89RocZ

iTrader: (20)

same question. i'd be curious to know how much i'd make

i know with my HSR over stock TPI, i picked up alot of topend..not sure how much but my mph went up near 2mph in the 1/4 so far in the summertime, and i dropped near 3 tenths so far. i made 246whp with the stealthram L98. i think i'm over 250whp now since i added more timing and picked up some time. with a hotcam on stock L98 heads i'd hope to be pushing near 300whp but that could be a long shot. ofcourse i've seen LT1's dyno near 330whp with a hotcam only. so who knows

customblackbird

iTrader: (15)

yea i kno the l98 with the stealthram runs just like a LT1 but the lt1s will make more power bc there heads are better thant he stock l98s. i think wit the hotcam and stock heads u have to change the studs and springs for the lift but idk about 300 whp... u mite get an extra 20whp wit the cam swap but since ur building the heads u mite as well just upgrade them with better heads... and if ur goin with the stockers i would port the hell outa them for the increased rpm/flow of the stealth ram/cam. thats what i debated so i said screw it and went with the new heads.

89formula350b2l

iTrader: (11)

i would think you would be around the 270-280 range with hsr hotcam.....if u want more with stock l98.....get a lockup converter pick up 20 on the dyno most likely

Orr89RocZ

iTrader: (20)

well a hsr l98 doesnt run like a LT1, LT1's are abit faster.
they got better heads and bigger lift on the cam to use those heads flow potential. also have abit better compression

you can definately pick up more than 20whp with a cam swap since the stock L98 cam peaks at .415 on the intake side when the head flows best at near .500. so a cam with around .500 lift and more duration will really get alot more air in to a certain point. i can see high 200's for sure since i'm already at 250. i figured a CC305 or 503 is what i'd run and that should make near 300whp or more.

customblackbird

iTrader: (15)

ive been told by many members that a l98 with an hsr and tuning will run close or faster than an Lt1... the l98 with the hsr will make more bottom and midrange torque and hp due to runner length/ tunnel ram effect and will also still allow the motor to breath at the top end and still make decent power(upper rpms power would max but hp drop off would be minimal), the Lt1 will only start to make power in the mid/upper rpm ranges and thats what there known for. yes the lt1 has better heads but the lt1 cam is hardly any more radical than the l98. ive seen the specs of the 2 cams. i did a post on the HSR with the stock cam and stock heads and ppl said it would run like an lt1 and prob even beat it. u also cant run a .500 lift cam with stock l98 heads without machining valves and spring upgrades but adding 1.6rr to a stock head will help big up 15hp and get more air where the hsr needs it.

i woulda guessed 20 hp or so with the cam upgrade with stock heads, but i would upgrade the heads since u gotta take them off anyway and there not worth upgrading or putting money into them since new heads are just alil bit more.

Orr89RocZ

iTrader: (20)

yeah you do have to machine the heads for lift over .480 i've heard. or you can shim the valves up. either way you'd need screw in studs for that lift

duration wise, LT1 cam is milder than the L98. its the lift that makes the difference. the lift on the LT1 with 1.5 rockers is like the L98 with 1.6's. thats the extra 15 hp or so.

go figure, my buddies 94 formula with k/n filter, and slp catback dyno'd 262whp while my HSR L98 with headers/catback/airbox mod made 246whp. both auto cars but mine is 2800 stalled lol.

bone stock LT1, a HSR L98 with strong tune (potential 250-255 whp i would say) might beable to take down a LT1 car. but my buddies stock auto trans 95 Z28 with longtubes/catback/air filter with 170K miles on it ran 13.42 at 102 on a 1.98 60 foot with street tires. stock stall with 3.42 gears. My combo went 13.49 at 99 with a 1.77 60 cuz i'm on slicks with 2800 stall/3.42 gears.

Lt1's with those heads and bigger lift cam is just mean!! i want 1.6 rockers now, but really want a cam