Hi Guys,

Just getting ready to pull up the 305 out fo the car and wanted some input.
What kinda power can I look for with the following mods:

Stock 305 TPI
AFPR set at 48-49lbs (which works best, Crane, BBK, Holley?)
Summit headers with no cat
COMP XR269HR---212/218 @ .50 .487/.495
TPI Airfoil
MSD 6A
MSD Blaster Coil
MSD SuperConductor wires
Timing set at 8-10
Stage II chip
Removing the SMOG crap off the motor---what size belt will I need after removing

Q: Does removing the MAF screen make any difference?

Also installing a new Hays clutch. Any input on Hays? Everything I've seen looks positive

 

You didn't mention if you were upgrading the heads. You should find out what the max lift is on your valve springs since the LT4 cam has more lift.

I removed my MAF screens and didn't notice a difference.

Hope this helps.

 

Gonna stay with my stock heads for now. I just noticed the lift on the LT4, may go with a Comp XR258HR or XR268HR. Less lift

UPDATE:

Goin with the XR269HR---212/218 @ .50 .487/.495
Spoke to Comp and they suggested this with the mods Im doin. They will also work withmy stock heads

 

Can't believe we got two replies in w/o someone saying "dump it and put in a 350." I'm right there with you Unholy 89. Getting ready to do some similar mods myself, except maybe not as extensive.

Someone told me MSD 6A was made for carb'd cars and won't do TPI any good. Anybody got any input on this?

 

You and me both, usually the 305 buzzards are circling with their 350 build advice by now. ROFLMAO

In re to the 6A box you should'nt have any issues regardless of fuel system

 

I wouldn't put that cam in before verifying each valve has .060" inch more travel than the lift.

And stock springs ain't gunna cut it.

 

How can I verify that? Everything in her is bone stock right now. Not sure what lift the stock components are.

Originally Posted by gcgarner
Can't believe we got two replies in w/o someone saying "dump it and put in a 350."


Funny thing is, I've got a fully machined 350 block in the garage that was gonna go in, but I don't want to get into changing all the comp crap and injectors.

 

Had it on a tpi 357 for some time, no problems whether it was worth the monye for the gain, is still qeustionable, but I must admit the rev limiter with the pills is a great feature, helped out with spark at high CR.

 

kinda a side note,lol, im doing a intake gasket at work on a tpi 305 maro,took me 8hrs just to replace the lower gaskets and put it all back together, my first but man what a bunch of crap to put back.have fun

 

If you went back out there and did it again right now it wouldn't take as long - fun learning curve lol

 

Well, here's my two cents...I'm in the same boat, just pulled a seized 305, and what am I replacing it with? A $150 low mileage 305. Sure, I'd much rather have a 350, and if I did, I would be all about doing mods. But the fact is, I already have a fast car, so I'm making this one my reliable (mostly) stock beater. No cam, no heads, no headers, no roller rockers, etc. So basically, having a 305 is the cure for the mod bug for me, just because I know that no matter how much money I dump into it, it will still be a 305 and it will still be slow without nitrous or a power adder. I think of the 305 as the Ford 4.6 of Chevy motors (i.e. no chance of ever being fast without some serious boost).

 

Speed Pro makes a nice affordable hyper and a forged piston for the 305" thats probably a route i would go. I believe they also make a quality moly ring. Maybe you could even consider a 3.750" crank, the speed pro pistons are usuable with that stroke if you use a shorter rod. I would think you have the 081 heads, I have a couple at home and i feel they are a decent peice of material. As for headers, you may want to look for a shorty header with a smaller primary tube length, being that your down on inches.

As for factory springs... read post #2 and it will give you a good idea about springs on chevy heads

https://www.thirdgen.org/forums/tech...-question.html
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ok bad link

https://www.thirdgen.org/forums/tech...-question.html

https://www.thirdgen.org/forums/tech...-question.html

 

I have nothing against the lowly 305. Camaro Performers Magizine did a story a couple months ago doing a cam/ head/ intake swap on a carbed 305 and picked up 150 HP, up to 372 HP @ 6200 RPM/ 350 Ft Lbs. torque total , and they stated that if it was a new roller cammed engine they could have picked up even more power.

Price wise with what they bought it wasn't bad, think the total was less than $1500 for all the parts including a new set of cast iron Vortec heads from a company called Shaver Specaility Co..

I also have a 350 that I'm building up for my '89, but if I can get that type of power without pulling the good running 305 I have, may just switch gears and go that direction.

 

Remove the valve springs. Install the valve stem seals, spring retainers, and keepers that you are going to use. Measure the travel of the valve from seated to when the retainer hits the top of the valve guide/seal. That is your total travel, which needs to be .060" more than your valve lift. This should be done for all 16 valves, as it can vary from valve to valve.

If you have the guides cut for positive-type stem seals, you're almost guaranteed to have enough travel.

 

Hey guys,

Looking around on eBay and found the ZZ4 cams for $100. Could I use this instead of the XR264HR with my stock heads. What would the performance difference be? I will be upgrading the springs

 

The ZZ4 has even more lift. But, it's a decent cam.

 

thanks 57,
Can I use it and only add new springs to my stock heads with no machine work? I have read on some posts that the ZZ4 has too much lift for my stock heads and will not clear. Is this true.

 

Still apply.

 

I not gonna have any machine work done. Higher springs wouldn't help?
What about long slot rockers? If I'm too close, I'll just choose another cam