blue birdy 87

Im looking for more power out of my 87 305 lg4 car. Im thinking of doing intake, exaust, and cam. I want to swap to a 350 but dont have the money to do yet and the car needs other things done.

Im thinking about getting the most extreme one that i can so itl be fun in my 305 and still be good when I upgrade to a 350. Obviously it has to idle and but rough idle is ok. Its a roller. Any suggestions?

Orr89RocZ

iTrader: (20)

For the price of a roller cam, you can find a 350 block and then some.... maybe even stock bottom end vortec truck motor or something.....

Thats not a bad way to go.


Wildest cam that will fit + stock 305 LG4 is not going to end up "fun". It will idle rough for sure but is not going to run.

If you want something that sounds nasty and may still run ok on the street, try the smallest thumpr series cams from comp. Will need to mod the heads for more lift.

1988transam

I agree with him for the price to buy the cam and modify your heads to work with it you will have the price of a 350 they where in almost every truck and van from the late 70s to about 2000 you are sure to find a couple at your local junkyard

89fast5oh

Last post was 9 years ago ...

Blackbetty1982

I would say go with a 350 find a old c/k truck with a 350 or even some of the 90s c/k1500s had the fuel injected 5.7, id buy one of those and throw money into it the 305s (at least mine) is not very easy to crank horsepower out of on a budget, for more than like 400-450hp on a 305 you would need to bore and do machine work so id just find a 4-bolt main 350 and toss it in, take off the stock manifolds and throw on some headers, intake, 4 barrel carb, and maybe some bored and polished heads (can do this at your house so saves ya some money) and bang you're looking at a really really good platform for power and ready for a cam

Mortorq

“I had a Crane 274H06 in my G20 van back 15+ years ago. Ran very strong.” (post#34)

Fast,

Was that a 305 that you had the old Crane 274H06 cam in your van?

That FT cam only has 218/218 @ .050”, but has a tight 106 LSA.

Amazing that a 106 LSA with that much duration in a 305 could lug around a van without 4:88’s!

But, what would be the EQUIVALENT cam in a hydraulic roller version?????

Fast355

iTrader: (2)

Yes it was the factory flat top piston 305 with the factory 53cc 601 heads. That is a short duration cam. Still pulled like 14 in/hg vacuum at 700 rpm. I had it advanced 4° over the 4° ground in advance. At 98°ICL it closes the intake valve pretty early and builds alot of low-midrange torque. It would happily lug that van around even in overdrive at 60 mph at 1,500 rpm. I had a 700r4 and 3.08 gears with the stock 1,600 rpm stall torque converter.

Tighter LsA makes your torque come on sooner, not later!

Roller equivalent...Get a Comp Magnum 270 custom ground on a 106 LSA rather than the 110 lsa it comes one.

270 Magnum roller out of the box
0.006 = 270°
0.050 = 215°
0.500 lift with a 1.5 rocker
110 LSA (Tighten to a 106 LsA)

Fast355

iTrader: (2)

Take for example the uber basic 204/214 most people suggest for a 305. The Melling MTC1 is 278° @ 0.006 on a 112 LSA and 108 ICL. Intake closing point is 67° ATDC. Crane 274 HO6 with a 274° @ 0.004 is out of the box at 59° ICL and 4 ° extra advance puts it at 55°. In actuality the slow lobes of the MTC1 are about 4° longer at 0.004 than the 0.006 specs show. Its really about 282 @ 0.004. The Crane 274H06 cranked at about 10 psi more on a compression gauge. 190 psi vs 180 psi. Even though it had a choppier idle the 274H06 had better performance just off-idle than the MTC1 did.

Mortorq

“Roller equivalent...Get a Comp Magnum 270 custom ground on a 106 LSA rather than the 110 lsa it comes one.

270 Magnum roller out of the box
0.006 = 270°
0.050 = 215°
0.500 lift with a 1.5 rocker
110 LSA (Tighten to a 106 LsA)

Take for example the uber basic 204/214 most people suggest for a 305. The Melling MTC1 is 278° @ 0.006 on a 112 LSA and 108 ICL. Intake closing point is 67° ATDC. Crane 274 HO6 with a 274° @ 0.004 is out of the box at 59° ICL and 4 ° extra advance puts it at 55°. In actuality the slow lobes of the MTC1 are about 4° longer at 0.004 than the 0.006 specs show. Its really about 282 @ 0.004. The Crane 274H06 cranked at about 10 psi more on a compression gauge. 190 psi vs 180 psi. Even though it had a choppier idle the 274H06 had better performance just off-idle than the MTC1 did”

Thanks Fast!

Would a Lunati Voodoo in single pattern with 106 LSA, 211/211 @ .050”, 4’ advanced additional beyond built-in advance be a good choice? (Carb’d L03, with #059 heads, Hooker 2055’s)

F-BIRD'88

A Melling #22280 roller cam installed a bit more advanced than cam card will run nice. 104/116 centers 110lSA
Needs head mods for high perf springs.
495-.503" lift Needs generous head porting for power.. reinstall heads on flat top piston 305 using
Felpro ..015" steel shim head gaskets.
Long slot rockers summit .550" lift stock diameter racing springs or LS6 springs 787 comp retainers shimmed for 120- 130 seat pressure.

Needs converter and 4.10's. nice hot rod idle.
A custom 4000 stall converter is not too much
power to 6000 rpm. 330-350 hp w/ ported heads 305 cid.
Hot rodded 305 cid sbc's like to rev up..

Same job as the Lunati 343 hp 305 build article but
Uses this Melling hyd roller cam.

DynoDave43

iTrader: (11)

F-BIRD'88, do you know if these are still available? I have not been able to find ANY steel shim gaskets for a 305. Looks like the last ones made were in support of a circle track series, and even those are all gone.

A search of the Felpro site shows only these for an '88 Camaro with 305.

https://www.felpro.com/parts/perform...d-gaskets.html

That will send you to an auto parts store. I chose Advance as an example, and they show only 2, both MLS as far as I can tell.

https://shop.advanceautoparts.com/br...12158655353151

F-BIRD'88

Felpro gasket #1094. Its a 327-350 gasket but works just dandy on any 305. 4.10"x .015" compresed.
Install clean and dry on clean dry surfaces.
Just put some black RTV sealer on headbolt threads and under each head bolt shoulder.
The gasket needs NO SEALER. A head bolt re torque is nice to do after a few heat cycles.
The GMPP head bolt set with smaller hex head allows this re torque with rockers on. Do not over torque.
Although the gasket bore size is 4.10" diameter it is no problem on small bore 283-305-307 engines.
The thin .015" thickness gives more compression ratio and correct effective quench clearance with correct stock 1.56" CH pistons on stock non decked blocks.
It is more critical that the head be flat than the block deck (within reason) If the head is flat you are good to go.. The block deck needs to be clean.
If your 305 block has been minorly decked a bit to clean it up, as long as the piston is at least .018" below deck at tdc you are still good to go using this .015" headgasket. (.033" or more net quench clearance at TDC)

DynoDave43

iTrader: (11)

Got it. Thank you.