Ok, i got a 87 305 tpi motor for my s-10...yea i know.. 350's are better.
I got a good deal, so bear with me.

I wanna do a slight overbore, with JE pistons... but here's the fu part.
I wanna run a 383 crank and 5.7" rods... would this make the displacement?
Is this possible.. i have been out of sbc's for a few years.. even then i just helped build a few.
Would this setup.. if working make a nice "streetable" nitrous motor?
I wanna be able to drive to events, hence the tpi and 700r4.

I would be running either a scat or eagle 383 crank, eagle esp rods and je pistons, i have a very competent machist locally... just havent had time to stop by his shop.
If this needs to be moved, fine... just wanted to ask the experts on the board first.

If this isn't worth the effort i'll just find a 350 and do a true 383... just wanted to wow people with the 305 and have them underestimate the car.
Thanx

PS. i was told you can't bore the 305 to a 4.000 bore... is that correct?

 

just by looking at an assembled SBC engine inside a vehicle, tell me how you can tell the difference in a 265 and a 434?

 

Sell it, get a 350 or 400 and tell your buddies it's a 305.

They really aren't worth messing with. Yeah, they can be made to make decent power and can even be stroked but you're still just playing catch-up to the bigger bore motors.

-Mindgame

 

that's what I was getting at

The major limitation for any inline valve engine is the bore. If you go with a bigger bore, you can get bigger valves. That's why Cup cars are limited in max more size

 

Stroking a 305 makes a 334. You do it the same way that you make a 383 out of a 350 with a 400's longer stroke crank. The downside is that you're using the tiny bore of the 305. You can start with a bone stock 350 and still be ahead on displacement.

It costs the same amount of money to build a 334, 383 or a 406. Actually if you have a 400 engine, it's cheaper to build the 406 because you don't need to buy a crank. Don't waste a good 400 engine by yanking out the crank for a 334 or 383 unless the 400 block is garbage.

A 305 bore is way to small to bore it out to 4". You'd be into the water jackets well before reaching 4".

 

two things which will hinder your buildup will be cylinder head selection for the 305's smaller bore and valve shrouding with whatever heads you go with if they have even a decent size valve.

 

I swapped an '88 305 TPI into a '83 Jimmy and thought it was worth the while (keep in mind the 2.8's were only rated for 120 hp/ 140 lbs-ft). No more multiple downshifts on long uphill stretches and the gas mileage even improved. That said, the only performance improvements were Hooker headers (for fitment) and a 3" cat back. The four-wheel drive S15's came in around 4500 lbs, so nothing short of 400 hp was going put it into the 14's, but as an all-around driver, it was a vast improvement over the 2.8 POS.

Leave the performance items for a car that can benefit from them and make the S10 into a reliable daily driver.

 

Would you like to place a wager on that? My car weighed 4060# and was able to get a 13.41@101.7mph with a poor 1.95 sixty foot. Do you think an extra 440# would have caused it to run 15s? The best it has dyno'd is 255hp at the wheels.

 

Well i guess i will try and search down a 350 roller block and redo it.
Tho i wish i make myself save for one of those Dart 421 or 415 short blocks... eheh.

Will the roller stuff work in a non roller motor as long as i use the stock roller lifters, pushrods and stuff??
Reason is i bought a sweet lt1 cam to go in it...comp cams reground.

Oh yea the truck is beyond daily driver status, its into fun status.
I have a daily, this is for the track and shows.

 

Not to start a flame-war, but you're comparing apples to oranges here. The Impy has better aero and sits a lot lower than a 4wd Jimmy. Best I ever saw on the G-Tech was a 16.2 (guessing flywheel horses were around 250), and that with 4-hi engaged.

 

82 a-10

Check the boneyards. Pretty much any 1500 Pickup from 88 on with a 350 will have a block capable of using the stock roller setup even though the factory used a flat tappet cam. just buy the block from the boneyard and your ready to go for a nice 383. Another way to tell without tearing down the engine to see if the lifter vally has the three tapped holes you'll need to use the roller parts you have is to check for the one piece rear main seal.

Old blocks don't cost that much from the boneyard and you'll be on your way to a nice engine for that s-10.

 

Ok not that I am a fan of this but here is a pretty good 305/307 based motor.....

Peak HP: 556.3 @ 6,500 rpm
Peak TQ: 518.9 @ 4,800 rpm

Block: '69 Chevy 307 block, 3.935-inch bore
Crank: Scat forged steel, 3.750-inch stroke
Compression Ratio: 12.2:1

Basically a .060 over 383 crank 305. 364.8 cube motor.

http://www.popularhotrodding.com/eng...0207phrbeckem/

Don't let the dirty pants fool you, guy knows what he was doing with that thing.

BTW he ended up with some Fastburn heads and a Performer RPM Air Gap intake to make that power.

Again, I would rather build a 406 and call it a rebuilt 305 if I was you.

Bret