brian_rs/ss

ok so first off i'm not really an sbc guy, most of my knowledge is towards lsx stuff. that being said, me and my dad put together a car back when i was in high school. its a 68 rs/ss 4 spd with a GMPP zz383. the car came with the motor and it ran decent so we left it. wellllll we've since come to the realization that it just isn't fast enough/cool enough. so pops wants a solid roller set up and i don't disagree, i think it would be ****. BUT the heads are the "fast burn" vortec style heads and we were told by a local machine shop to ditch them for AFR or dart. SO dicked around jegs with part numbers and a basic idea of what we want and here's what i came up with:

Dart pro 1 heads, 64cc x 215cc, 2.02/1.60, assembled with dual springs
lunati "voodoo" solid roller cam 231/237 .555/.566 110 lsa
lunati solid roller link bar lifters
lunati 1.6 roller rockers
holley 770 street avenger carb
all ARP bolts top and boottom(short block will be rebuilt/freshened up)

the car already has a vic jr 2975 single plane, holley 650(forgot the model but its definitely too small), hooker coated LT's, 3" duals with a single lateral mounted magnaflow.

so basically i need to know that i'm not mix matching parts. and/or making a newb mistake.

1dirtybird

iTrader: (7)

Thats a tiny solid roller cam... Id stay hyd roller for that... less hassle.

If it were my car id leave those heads and put better springs on em. Then pick up a GM 847 cam. all you got to do is knock the dowm pin in. will sound nasty and make 375-400 rwhp... depending on the car that good for high to mid 11's in a street car and bottom 11's to high 10's in something set up.

Also skip that street avenger and spend the money on a Holly HP or a quick fuel.

Small blocks need a 100 less hp to do what ls1's do. Just ask my buddies that call out my car lmao

and if you decide to ditch the heads and want to sell them for a deal lmk i'll take them.

My set up is far less and it will see high 11's. all motor and bottom 10's on juice

brian_rs/ss

yeah i believe you about the sbc/ls1 thing. but my dad and i are kinda nuts, looking for about 425-450 rwhp and more importantly more rpm, probably about 6500 or so. car nees longer legs for sure, falls on its face at @ 5500. and his thing is that all his cars back in the day were solid roller, he misses it and wants to do it again.

so let me ask if we WERE to go solid roller, what would be a good duration/lift to shoot for?

1dirtybird

iTrader: (7)

Dude then go mid 240's mid 250's duration and .600 lift!!!

What gears? gonna need 4.10's or better.


The cam in that motor is tiney, I think smaller then 200 duration lol at best its a zz4 cam 208/221 duration.

brian_rs/ss

no its a 222/230 not sure what its from but its a GM zz grind.

ok i was looking at another lunati grind. 249/255 .585/.600 110 lsa supposed to be 2800-7200 rpm range. but it needs 10.5:1 compression and 4.10 gears(like u mentioned) however it's already pretty limited in speed with the 4 speed and 3.73's. the one thats slightly smaller is supposed to be used with 3.90's, was thinking i might try to just get away with that cam and 3.73's. that grind is 243/249 .578/.585

1dirtybird

iTrader: (7)

Thats more like it!! Have the heads milled to the chamber size you need for 10.5 or better. I run iron heads and 10.2 on 91 here in the desert. The aluminum heads can take more timing due to heat dissapation

hogwild1717

Them heads could make good power... Just re think your carb and cam choice... A nice hyd. roller cam from comp would work better than any lunati junk!! Keep the factory lifters, the're just as good as the aftermarket one's! Go big 245 248 580 590 lift!!! Listen to my VERY small roller in my zz3 350. Crappy cam in the dark My cam is 234 238 545 555 and i have dart pro-1 200's

brian_rs/ss

10.5 would mean like 62cc or so chambers? we have 93 here in texas, so 10.5 wouldn't really be a problem unless valve clearance comes into play.

but see i would rather have good heads and a crappy cam than vise versa. like you, you are running pro-1's and a little cam and are pretty well off. where as if i just upgraded cam and kept the same heads, i'd still be limited. my thinking is that by going to milled pro-1's that no matter the cam, the heads/intake will support higher hp and higher rpm.

as far as lifters go, they aren't expensive enough to sway me one way or the other. i know hyd rollers are just as stout as solid, especially below 7k. but i'd rather do solid just for the sound and aggressivness alone.

1dirtybird

iTrader: (7)

As for lunati junk..... I'll post some pics of Comp's junk cams, had a solid rollor go out in the old motor. Ate all the loabs, cashed out everything 6k down the crapper. Seen it on many LSX cam's as well.


Comps response we'll give you a new cam..... go FFFFFFF your selves. I will never use nor install a comp cam at my shop. EVER


You have a fun build idea. I like the bigger cam for sure.

brian_rs/ss

ok so talked to my local sbc expert looks like we are gonna knock this out in a few different chunks. first thing is ordering the pro-1 heads, dart intake, and 750 hp carb. install the top end get it dialed in and see how we like it. THEN we will make our cam choice based off how the motor runs like that. then once we have something spec'd out, pull the motor, do the cam swap, and convert to all ARP goodies.

and obviously we will be selling the old stuff. holley 650, vic jr, fast burn heads, and that 222/230 cam.

1dirtybird

iTrader: (7)

I love my Holly 750 hp series... Cant go wrong. Also reccomend a wide band, it really helps to dial it in on the street.

brian_rs/ss

yeah if i need a wide band i got a buddy that will let me borrow his. would just have to weld up an o2 bung.