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  #16 (permalink)  
Old 04-14-2011, 09:11 PM
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You got a leaky spark tube...
 
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It doesn't matter if it's a mopar or a Chevy if he's telling you to change the stroke by changing out rods then he's giving out very bad information.

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  #17 (permalink)  
Old 04-14-2011, 09:23 PM
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You are right,i think he was just teaching there to use the dyno & other stuff.
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  #18 (permalink)  
Old 04-15-2011, 04:36 AM
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By the way 2 good points made,the whole car has to be setup right as well & the 11sec.305s that were spoke of; that was the class that guy with the cutlass was in(i think).if i remember that class had to run iron heads & complete stock bottom half.Street elm? Anyway its proof the 305 can run hard without boring.Is the 350 with 305 heads a good combo? If i remember right,doesnt that push the comp.to 10?
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  #19 (permalink)  
Old 04-15-2011, 06:12 AM
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Quote:
Originally Posted by Blazin72
True they both have the same stroke...
Which was the sole point I was making. But since you brought it up,
Quote:
The 305 crankshaft uses smaller counterweights ...
The difference isn't in the counterweight size, it's in the weight. Even w/a different bobweight, as long as the rods and pistons are weight matched the difference will only be in the balance factor, either over- or under-balanced from the 50% "norm".

The crankshafts used in 305 engines w/2-piece RMS were also used in 350's and carried identical casting numbers (the most common is the 2-piece RMS c/n 442):

3932442 305/350 69-85 2.45/2.10 3.48 Nodular Iron
14088535 305/350 86 & UP 2.45/2.10 3.48 Nodular Iron One piece seal

A crank used solely by the 305 wasn't until '86 and possibly beyond, it was a 1-piece RMS crank c/n 14088526.
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  #20 (permalink)  
Old 04-15-2011, 06:33 AM
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Quote:
Originally Posted by 305mouse
Is the 350 with 305 heads a good combo?
It is one way to go. Mostly done where the budget or entry-level racing class restraints are such that using better heads cannot be done. Suffice for me to say that there are other, better heads to use than a set of reworked 305 heads- and that's the main point, here: stock 305 heads are just about worthless on a 350. Unless you have the tools, skills to rework the 305 heads yourself, using a better head from the get-go would be my recommendation.

That said, I'd much rather see you using an L31 5.7L Vortec long block as the foundation- good heads, 1-piece RMS and a roller camshaft set-up all rolled into one.
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  #21 (permalink)  
Old 04-15-2011, 06:50 AM
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Ok,what year/make should i look for this L31?.Do i have to use a"vortec" intake?,i would like to use a carb not TBI/FI. We have a 89 gmc truck out back were i work,has a 5.7tbi with roller rockers(factory i think?) would that be a L31?
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  #22 (permalink)  
Old 04-15-2011, 10:07 AM
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My 85 305 is the same as the 350 from 85 .
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  #23 (permalink)  
Old 04-15-2011, 11:33 AM
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Quote:
Originally Posted by 305mouse
Ok,what year/make should i look for this L31?
The L31 Vortec was used in trucks and SUV's 96-00 (or 2002, depending on where you look). VIN "R" is a Vortec but engines can be swapped around, so better to look at the block to see that it's roller cam-equipped (an easy way to tell is to check the length of a pushrod- roller engines are 7.2" long, flat tappet engines are 7.8" long).

1986-Up 5.7L Roller Cam/Lifters Block Casting Numbers:
10243880
14011148
14088526
14093638 (one guy says has one w/o tapped holes, bosses were there).

1986-Up 5.7L flat tappet (i.e. non-roller) Block Casting Numbers:
10054727
14079287
14088548
14101148.
These flat tappet blocks may have the provisions for a roller cam (i.e. bosses cast in and tapped for the spider, tapped holes for the cam plate, etc.)- but very well may not be so equipped- but these blocks will have a flat tappet cam and non-roller lifters, no spider, etc.

There is a flat tappet block and a roller block that both end with the numbers 148. 14101148 is a flat tappet block, 14011148 is a roller cam block.

Some blocks came machined for a mechanical fuel pump. Others (most) have either partial or no machining done to use a mechanical F/P.

A member here posted the following regarding the fuel pump (sorry, I don't recall the name to give proper credit):
"All of the 638's that I've seen (not that many, 5 or 6) have had the pump rod hole drilled.
I've seen 880s both ways, and both 14011148 I've seen were undrilled."


Quote:
Do i have to use a"vortec" intake?,i would like to use a carb not TBI/FI. We have a 89 gmc truck out back were i work,has a 5.7tbi with roller rockers(factory i think?) would that be a L31
The L31 Vortec heads use a carbed intake made for just them- earlier Gen 1 SBC intakes will not fit.

The '89 truck engine may have a roller cam and lifters- or at least have the tapped bosses for mounting up the spider and cam thrust plate- BUT some '86-'95 blocks are cast without the bosses and are not able to use the OEM roller cam/lifters w/o a lot of work. Basically not worth fooling with, IMO.

None of these engines came w/roller rockers from the factory, so if that '89 engine has them, they're aftermarket. This short block would be fine to build with, but you'd need to check the c/n of the heads.
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  #24 (permalink)  
Old 04-16-2011, 03:50 PM
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Ok,with all your great info i found a motor at the swap meet today! I cant bellive it snowed like crazy!, anyway i found motor/trany & the computer for $650. It came out of a 97 chevy 1500. 117k on it. Im so pumped! Now...the build. Thanks again.
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  #25 (permalink)  
Old 04-16-2011, 03:59 PM
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Cobalt, your Vortec info is worth its weight in gold. Thank you.
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  #26 (permalink)  
Old 04-16-2011, 04:27 PM
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I will be up all night with a 2L of Coke & a Summit mag. Lol! My girlfriend said "great,there goes our summer"I said yep!
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  #27 (permalink)  
Old 04-17-2011, 04:47 PM
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Quote:
Originally Posted by techinspector1
Cobalt, your Vortec info is worth its weight in gold. Thank you.
I appreciate the thumbs up, however like so many things it's largely a rehash of what has come before. Maybe condensed into an easier to deal with format, but thanks just the same.
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  #28 (permalink)  
Old 04-17-2011, 11:43 PM
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A 305 can be pouty with a perfmr cam .420/.442" lift , Perfrmr intake, Q jet, vortec 906 heads, 400 crank 3.75 stroke, PM 6'" rods and pstons. In a truck with 3.73 gear 3.74 bore and 3.75 stroke. The mathematics say yes.

15.7 at 88mph, Zoom3 4800lbs 85 GM 305 truck. Is that fast ? It spins them out of the hole with a 350C, stock stall, TCC on a B+M kit.
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  #29 (permalink)  
Old 04-18-2011, 07:45 AM
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I remember a kid my freshman year that had /has a 78 chevy 3/4ton 2wd.& he had a 350 with all bolt ons with a wicked cam,factory 410gears then he stuck a set of low pro. 16" tires from a older vet. He said it put his gears down in the 425. Range.Let me tell you, it made the other gearheads at school set up & notice! For the first 600ft he would run with/beat the cars! He must of had a hell of a stall, because he could whined that thing to the moon before he took off. I never got to see him at the track,but he would always come to school with 15.08s.on his window & other kids would confirm being beat by him. Anyway, i know it runs very well on the street! I like it because its different & that has a big COOL factor!
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  #30 (permalink)  
Old 04-19-2011, 12:05 PM
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305 ci / 372 hp at 6,100 rpm. Read link below.

http://www.popularhotrodding.com/eng...cks/index.html
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