I've built several good 383's. They are a good choice for large 4X4's.
Plenty of low end torque with the proper cam. They can get those 35 inch
tires turning. I know alot are going to say why stroke a 305, spend that $
on a 5.7 block. Well, been there done that. Ive acumulated a few 5.0 factory
roller cam blocks over time and I am in love with the roller cam blocks.
Excelent for fast open and close ramps without valve train noise and wear.
Don't want to haul them to the scrap yard. Has anyone had any real
experience with a 305 stroker. How about some numbers with actual HP and TQ.
I ran desktop dyno a couple times and got some funky numbers. HP was in line
with what I thought it would be but the torque figures actually came in
lower than the 305 factory ratings. My thinking is about a 9.7 compression,
191 heads and factory L98 grind with Tuned Port Induction. Small intake
runners, small bore and mild port matching and smoothing should get a good
cyl. fill. Got a set of type 3 24# injectors that should feed it. Who has
any valid opinions? Oh yea, what about the lighter recriprocating(spell
check) weight. Good for another 500 RPM over 383?
If you are having problems, you need to "stroke" your axle ratio gearing
rather than look for more power because if you are running 35's with
stock gears you are hurting more than a stroked motor will cure
properly. Slap in some 4.56's or 4.88's and you will find what you are
Yea, I'm running 4.56's. 700R4, L98 stroked to 383 in a 83 4X4 now. Was just
out in the garage looking at the blocks wrapped in plastic wondering what to
do with them. I put a 350 carb set up into a astro van a few years back.
Was just running a winter project through my head and thinking about using a
5.0 Tuned port in a AWD Astro. I have my eyes on one that needs a motor.
If your going to do a AWD Astro, might as well get the 96 UP MPFI
"Vortec" intake & injection system. It will clear a lot better then a
TPI set-up, even in pre-1994 Astro's Which have a shorter cowl to intake
clearance then 95 up shells have. I have seen 94 MPFI 4.3 Vortec
Astro's. They have just enough clearance. TPI in a pre-95 astro always
means massauging the lower cowl section.
As for the stroker 305, If you got the time and money to do it right,
heck it's worth a shot. Aftermarket cylinderheads will flow better on a
stroker then stock heads. 1.90 on the intake valve, 1.50 or 1.55 on the
Get a TPIS Cam, use H-beam rods, and good F-M pistons. Bump your
compression ratio up to 10:1 or 10.2:1.
And if your really looking to do it right, I beleave a 88 and up 4L60
1/2 ton transfercase (I don't now the numbers) will bolt in. Giving you
real 4WD with low range. Also look up Overland Vans. They make lift kits
up to 8 inches for AWD Astro's.
Kinda building with what I got. Have a couple of complete TPI units in the
garage. One from a 89 Z28 and the other from a 87 GTA. Both from local kids
that couldn't keep them between the white lines. I know the air ducting is
gonna be a bear. Not looking for off roading. Got the big white chevy out
there in the garage. It is a TPI set up and can turn heads. Looking for a
sleeper. Always liked being at a redlight with some kid in one of those jap
jobs reving his engine. Light goes green and when he finally catches me at
the next redlight he is ashamed to even look at me. It will really make them
want to go hide when it is a mini van that made them look bad.
The simple ducting issue is to get a 96 up Ram Air inlet box from a
Firebird with the WS6 package. Fit it to the hood, and make a freash air
inlet in the hood. Either drill it, or use a medium mesh. With a
modified hood bra, no one will ever look close enough.
Who Me? I wouldn't know a sleeper if I was driving one.
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