TAdriven98

iTrader: (2)

I just sold my LS1 trans am and picked up an 86 TA with a 355 SBC, the bottom end has eagle rods, forged speed pro pistons, 10.5:1 CR and Air Flow Research 195CC heads. I am thinking about running the Comp Cams XR300HR hydraulic roller cam 248/254 degrees@.050 inch lift, .562/.580 inch lift, 110 LSA. If i run this cam I think the victor jr. intake with either a 750 or 850 CFM carb. This is my first sbc project so tell me what you think of it, what you would change? And help me with ignition setup. By the way this will be a street car driven 3 or 4 days a week. Not really worried about gas milage, because I have another car I can drive.

NOSjohn

iTrader: (9)

If you have the 1.450" OD Hydraulic Dual Valve Springs on those heads, which are standard, they have a limit of .550" maximum lift. So, you would need to change the springs in order to run that cam. Otherwise it sounds like a stout motor! The Vic.Jr. would work well with a cam of .500 lift or more and the 750 carb is fine.

CTSV05

Just be careful of your rpm expectations with a hyd roller.

Unfortunately the lifters are heavy and require a fine line on spring pressure.

Should be a good combo with the correct gearing.

TAdriven98

iTrader: (2)

Would you suggest going to a solid roller over the hydralic roller, does going to solid roller require additional work to the block?
Also I just got an t56 from a LT1 car I am going to swap that in and ditch the 700r4. I realize i wont be able to spin it as high as the ls1 but how high am going to be able to go?

NOSjohn

iTrader: (9)

No, but going to anything roller requires additional money. The average roller setup is from $1,000 - 1,500 + ...a plain single patter solid cam will work fine with that motor and make good power. How high you can spin the motor is determined by how good your valvetrain components are and your cam. The cam you have chosen should be able to spin 6,800 + ...but you don't have the correct springs in your heads. If you install that cam with the way your heads are setup now, you will get binding and wipe out your cam and possibly other parts of the motor.

TAdriven98

iTrader: (2)

I am going to use the springs comp cams sells with the cam in the kit, I also plan on running their roller lifters that are made for retrofitting a pre 87 block with special length pushrods, if you could recommend another cam that would make similar power that isnt a roller setup I am open to suggestions, so far I havent bought anything valvetrain or intake wise, right now the car has the afr heads with a rpm intake, an a 268 Xtreme Energy 224/230, .477/.480 110lsa. Basically I am looking to add more power because I miss my 98 TA and this car isnt as fast. Would like to see high 11s out of this engine combo.

slow trap

iTrader: (22)

that's a pretty healthy cam for a 350,i'd say peak hp will be very close to 7,000.i'd try the next size down the.s/r setup shouldn't be that much more expensive since you need springs also. solid roller lifters is around 250-300 compared to 175-200 for hydraullic roller lifters and the cams is about the same so i'd say go s/r. good luck whatever route you decide.

Villain281H

iTrader: (5)

The 750 carb will work fine, but the above mentioning about your cam selection is true; you're looking at spring work and a shift point close to 7 grand or more with that hydr. roller you have in mind. A solid roller might provide another 5-10 ponies, but requires periodic maintainence of the lash. Either way, you should see mid 11's with this combo if you set everything up right!

For comparison sake:
I ran a crane saturday night special solid cam (smallest one they make in a solid grind for that line) with .518/.536 lift and 230/238 duration in my 355 with Canfield 195 cc heads, 650 dp Holley carb (removed choke, but otherwise stock jetting), Victor Jr. intake, 9.6:1 compression, and 1-3/4" headers and 3" exhaust. Made 325 rwhp and ran 11.90s in a 3450 lb car with 3.73 gearing and a 3400 stall convertor in a TH350 transmission.

Derek

TAdriven98

iTrader: (2)

Peak would be around 6500 rpm and close to the 500 hp mark fwhp, with the hydraulic roller cam and recommend springs from comp cams valve float would still probably occur 100-200 rpm past peak power, so a solid roller may be better, this comes straight from comp cams tech line. They said there would be more power if I went with a solid roller. But this engine will see some street duty.

slow trap

iTrader: (22)

my last s/r cam was a .575/.575 and 255* and was easy on valvetrain and rarely had to adjust the valves,probably because of the mild ramps.my friend has the next size down cam from the one you are wanting in a 383 and shifts between 6500-7000 so the 248/254 would need to be spun to 7k to reach peak hp in a 350 i would think anyways.

Ls1LikeNoOther

I just read the post for the first time,and the first thing u always gotta ask is how much street use will you use...Solid rollers will always make more power but require more maintenance...Although I had a guy last year with a stock bottom end 355,comp hy roller cam,edelbrock e-tec 200 heads victor intake 750 quick fuel car went 12.1 made around 520 at the flywheel... spun it up to 6600 on the shifts..

sidewayz28

iTrader: (24)

go check out www.thirdgen.org from what i hear and have read over there the Victor JR intake is not the best