ok I have a 1994 c1500 its got a rebuilt 350 with the crane 2030, open element intake,full exhaust etc etc. All the free mods are done already as im basically trying to squeeze every last HP outta this thing, would a switch to 305 small chamber heads be worth it? This things pulls like a scalded dog till about 3rd then it drops off, I wanna get a lil more top end

TIA

 

i'd say you'd probably need better flowing heads and or bigger cam then imo.

Btw don't forget if it's pulling through third in a big brick your doing very well.

 

I posted this question on these boards and the answer always seems to be - yeah it gives you more compression but most 305 heads flow like total crap so it's not worth it anyway. I still might try it though since I have some spare 305's around

 

according to fast305's tech articles on here and his stuff on the truck forum, you can make a 305, yes a 305, haul ***., im thinking like ported 305 TPI heads.

and the cam is perfect for the truck i haul a bunch of stuff around so its perfect for me, and my choice on heads is somehwhat limited to what i can afford. I may even look at some 305 vortecs

 

305 TPI heads fully ported and worked can flow around 240+ on the intake and 190+ on the exhaust, but it takes ALOT of work, more work, flow bench, epoxing back up, and more work.

Why not use the 193s from your 350. They can haul *** as well.

I found out that 305 heads on a 350 will boost compression higher than you want it, atleast for a truck oriented cam on pump gas. With replacement L05 type pistons the compression will be between 10.3-10.5:1 compression with a .025" compressed head gasket depending on the compression height of the piston installed.

If you are still running the 2030 cam, there are alot of better, more powerful cams out there.

Don't you have the L98 083 TPI heads already?

I chased my tail trying to make my engine pull in 3rd, the solution is to raise and widen the powerband, install gears, raise shift-points, and install a higher stall torque converter.

I was trapping 96 MPH with a 312 in a 5,200 lbs brick. Upshifts occured at 6,300 rpm, 2,800 stall, 3.73 gears, and a roller cam with a powerband of 1,500-6,500.

 

gas mileage(or pump gas, for that matter) doesn't seem to be in the picture for you guys, does it?

anyway,

the answer really seems obvoius to me, yes, more compression=more power, but also a higher chance for problems, knock, a much higher necessity of 93+ octane, and seriously, when you've already got a set of 350 heads with loads of potential, why take a risk on a set of 305 heads that were never really designed to be put on a 350?

compression makes power, but so does more air(as long as you've got the fuel and spark to compensate), so why don't you just start hackin away at the 350 heads and see what you can come up with?