I have a 305 .030 over with 2.02 1.60 heads on it and a performer intake with a 600 holley. I am making a stroker out of it and am not sure how. I need to know if all i have to do is get a 400 crank ground to fit in the block and just use my rods and pistons i have or if i need to get a different length rod. and yes i want to use my 305 and not a 350 or 383
A 2.02-inch intake valve will not fit in a 305's tiny bore...Not only do you not know what you have, by wanting to keep it you're barking up the wrong tree.
That combo will net you 339.5 cubic inches.You'll have to get the main journals on the 400 crank machined down to fit the 305 block. Check with piston manufacturers like Speed Pro, KB, JE, etc for piston choices. This will help determine what rod you'll use. Since the price difference between running the 5.7s may be too steep. You can go 5.565 or 5.7s. 5.7s would be the better choice. Anyhow, once this is all said and done, you could have built a 383 for the same or less and made more power. Even in areas with strict emissions, they would never know the difference between the 339 vs a 383 or 350.I have yet to hear an arguement to convince me of this build over a 383 or 350 or 377. I have yet to talk to someone that did this build and did not wish they would have gone the bigger cubic inch route. 350s are too plentiful and cheap not to go this route.With that said, price out both options and see which works better for you.
Also, in case you hadn't read GibTB's post, 2.02 valves will NOT fit in the small bore 305. Period. Check this month's "What's Your Problem" P.62. And if you skimmed the forums, you would find MANY people that say DO NOT try to make a performance v8 out of the 305. It never was and never will be (I'm sure somebody's now gonna come along with some 600hp 5.3L chevy, but the price is far too high for what you get). If you want to be out of the ordinary, build a 434 smallblock. I've heard of 'em but have yet to see one of my own.
-----------------Projects: '72 Challenger Rallye 340 (motor's seized, will be sticking in a 383 from a 300), my '04 Blazer 4x4 DD
I just can't leave this one alone, so here it goes. Unless you are going for torque there is no advantage to this combo campared to a standard 350. The 305 is the redheaded stepchild nobody wanted & to put a perfectly good 400 crank in it is like giving flowers to your hated mother-in-law when your wife should have got them.
DONT YOU HATE WHEN YOU WANT TO DO SOMETHING AND EVERYBODY TELLS YOU NOT TO. BUT IN THIS CASE THEY ARE RIGHT.... I WOULD NOT GO WITH A 5.565 ROD IF YOU DO THIS COMBO. IT WILL PUT TO MUCH SIDE LOAD ON THE PISTONS AND COST A BUNCH OF POWER. THE HIGHER THE RPMS THE MORE. THINGS WILL WEAR OUT REAL FAST....ALSO IF YOU DO PUT THIS TOGETHER YOU MUST HAVE IT BALANCED.
THERE ARE 2 KINDS OF CHEAP PARTS..THOSE YOU SCORE FOR A CHEAP PRICE AND THOSE THAT ARE CHEAP MADE.
As if Ive not said this befor,305's have benifits and if you guys have read some of my past posts,these are apparent facts.To your fortune firebird198,I was looking to do that build 4 yrs ago 4 a buddy with a 90'TA 5.0 mounting a BIG fkn turbo and 2.73's outback,he wanted to run the Maxton Mile on the east coast.The pistons from Speed Pro @ the time were around 500 bucks 4 forced induction to setup on a 5.7"rod,6.0 wont clear the rod angle without ring bore interfearance.Due the angle of the intake valve in the sbc head,the valve will clear the cylinder wall @ low lift rates,however shroud the he!! out of the induction A/F mixture,therefore a pointless effort.So bad idea,simply put.1.88/1.92's are recomended.But as these guys have said its costly to build a stroker,due the machining cost.Bottom line if you want to build a BIG turbo engine for top end,or fuel mileage,its a great engine to start with.But to run the quarter times,cubes my freind,lots of cubes!
first off, i do agree with everyone else, the valves are too big. i can't remember the exact thread, but if you go to to popular hotrodding's site, you can search for a stock 305 build they did. they used vortec style heads with 1.94/1.5 valves. i personally think anything stroked is cool, but don't know much about stroking a 305. you can check out speedomotive.com. they have a stroker kit for the 305, that comes with the rods, pistons, rings, and crank. there is also a checklist where you can add balancing, flywheel, balancer, and other things to make installatiion easier. they should also be able to tell you what work would have to be done to the block for it to work. if you do stroke it, post some numbers. ive got 4 305's that i wanna go through before i build my 350. 350's are cool til you put .560 lift solid roller cams in them, then they just eat your wallet and leave you with no lunch money. whatever you decide, have fun and good luck
the thread i was referring to was "what can i do to make my 305 pull like a train". i highly suggest reading that. it was a very heated discussion that contains lots of good info about building a 305
Why not sell the Chevy and get a running Buick or Pontiac 350? They both got bores of similar size to the 305 and stroke similar to the 400 and you will have an extra 10 cubic inches.
1970 nova ss396522ci/798hp-i really want to buy a GV OD for my junk... doin' it at full weight with a plate on W's!!
To answer the OP's question, the 305 rods will need to be used and a custom piston with a shorter deck height will be needed, I suggest Calling Wiseco Pistons, They will help you out on telling how to measure your needs for the new pistons. The 2.02's will fit with minimal clearance if you bore the 305 to .050 over but again the clearances are very tight.If you could let us know the exact purpose for wanting to build this particular engine or reasons why you must build this engine, we could probably help you out a lot more with suggestions that may be more beneficial than stroking your 305.
better to destroke a 400 or a 350 than to stoke a 305, the bigger bore will help the air flow through the valves. this will be more effecent and will turn more rpms
Then again the smaller bore of the 305 could mean the difference between using 87 octane gas vs. 93 octane for the bigger bore of the 400. I still say buy a trans adapter and use a running Buick or Pontiac 350 engine.
the outside diminsions of all sbc are the same...where a 262 will fit, a 400 will also fit...for smog inspection purposes, if the inspector is smart enough to look for an offset balanced damper or the third freeze-out plug he's in the wrong job anyway...is there some racing class rules you're trying to fit into???the majority of responders have valid points, especially in the valve size, shrouding, and air flow volume remarks...if high rpm's (over 6500) are in the picture, the longer stroke will put more stress on the rods along with piston speed...think of spinning a yo-yo on a short string as apposed to one on a long stringfor the money and work involved you'd probably be happier with a 350 block even if that isn't what you want to hear