can i get an iron 4.6 block bored out?

ADRENLN · Aug 7, 2006

or is that just for the aluminum 4.6 cobra and explorer blocks? if so is is bad to bore these blocks a little? is there not enough room?

also how would this effect a car that is going to get a blower?

jstreet0204 · Aug 7, 2006

ADRENLN said:
or is that just for the aluminum 4.6 cobra and explorer blocks? if so is is bad to bore these blocks a little? is there not enough room?

also how would this effect a car that is going to get a blower?

You can bore out iron blocks. If you are just talking about 20 or 30 over, it isn't a problem. If you are talking about making it a sleeved big bore, it can be done, but it is expensive. I think the sleeves alone were somewhere aroun 2k.

SaleenGT2001 · Aug 7, 2006

any machine shop can bore out an iron block. thats what all blocks used to be made of.

DropTopPony · Aug 7, 2006

no big bore with the iron block but you can find the Teksids for 300 dollars locally like i did.

TweekedGT · Aug 7, 2006

I got mine bored .030 over and that is as far as you can go. The cylinder walls start to get a littl thin after that. You put a 3.75 crank in there and it makes a 302.

RedDaemon · Aug 7, 2006

TweekedGT said:
I got mine bored .030 over and that is as far as you can go. The cylinder walls start to get a littl thin after that. You put a 3.75 crank in there and it makes a 302.

u make it sound so simple

ADRENLN · Aug 7, 2006

thanks guys! dont most built blocks from companies (mph,vt, fox) come with some sort of bore anyway? i assume its just very minor but i heard that they do slightly bore them? any truth to that?

what does a small bore like that do?

to turn it into a 302, you do make it sound easy! there has to be more to it. what are the risks of that and how about price?

blackfang · Aug 8, 2006

You can sleeve the iron block for a big bore kit, but the darton sleeves are expensive

stangGT97 · Aug 8, 2006

blackfang said:
You can sleeve the iron block for a big bore kit, but the darton sleeves are expensive

exactly what he said. I did a good amount of research, and it turns out that it is cheaper to purchase a used Teksid aluminum block and send it out to have it bored than it is to re-use your existing iron block, specifically because the proper way to bore an iron block is to wet-sleeve it and the sleeves are close to $2000. I still say the best way to get to 302 cid is to do a big-bore aluminum block... some will agree, some will disagree, but the fact is that a big bore 302 will make more power than a 302 stroker. As far as longevity goes, I can't comment. Just get the best of both worlds - a VT 324 BB/stroker

ADRENLN · Aug 8, 2006

thanks guys for the info. i guess i will back away from boreing the block. i read about the sleeves on one of the engine builders websites. i was under the impression that it could only be done on the aluminum block. guess i misunderstood. either way, it is too expensive for me.

i hear strokers are not too good on these engines as they are not very strong and could cut the life of the engine short. so i might have them give the small bore .020 or somthing like that.

i think they do this anyway. thanks again....i really dont need to spend extra money as it is taking me forever to save money for this anyway.

stangGT97 · Aug 8, 2006

well, I'm not sure about the longevity of a stroker, but many people are running them with no problems to speak of. I think the biggest issue is that the stroke is long enough that the piston comes out of the sleeve at the very top of the stroke, as far as how this affects the engine strength in the real world, I don't know. But the thing is, a 302 stroker is less labor intensive than a 302BB... it's just a matter of installing a forged stroker rotating assembly instead of retaining stock stroke. But like I said, this is all hearsay, I obviously don't have experience with a 302BB or stroker, but from facts and figures alone, the BB seems to be the best route.

ADRENLN · Aug 9, 2006

yea i hear bb is the way to go too over the stroker. i dont think im will go either route. ill just stick with a plain forged short block but i want it to withstand everything and be reliable.

i assume i dont need a bb or stroker if i have the internals forged. cant i just turn up the boost on the built engine if i need to make more power? i realize that with the bb and stroker it would take less boost to hit my goal power mark but its cheaper to just up the boost.

i was just trying to get an edge/advantage if you will. that was only if it wasnt going to be a pita. i considered the bb or aluminum block for a weight advantage. as it sits now i am just cant wait to get a blower on the car so i will go the quickest way possible....that is the cheap way....no bb or aluminum.

ive had my blower cams already in for almost a year with no blower!!!!

stangGT97 · Aug 9, 2006

you can buy stock bore/stroke forged rotating assemblies, that is not a problem at all. But, you will probably end up having your block bored 0.020over or so just to clean up the cylinder walls, and so you would have to find pistons for that exact overbore. Like I said, some people feel that while the engine is apart, it is a perfect time to get a few more cubes with a stroker or BB, but you absolutely do not need to do that if you don't want to.

ADRENLN · Aug 9, 2006

thanks gt97!

stangGT97 · Aug 9, 2006

ADRENLN said:
thanks gt97!

sure thing

46gtsblown · Aug 9, 2006

so is it really worth all of the hassell to pick up 6ci.
I think not. The only real reason to bore over size is to rebuild a motor.
The tiny amount of gain is not worth the $ it takes to get it.
For the money it would take to pump it up that 6ci you could go a long way towards a power adder and make some real power.

Now the 80lbs weight saving fron an alloy block will be well worth the effort, combine that with a tubular K member and you have removed 100lbs from the front of your car. That in my book is money well spent.

Dwayne

Mike97gt · Aug 9, 2006

Sure it's cheaper to stroke our motors, but what they really need is more bore. Our bore /stroke ratio stock is worse than a 347 stroker 5.0

the reason a larger bore is better is because it unshrouds the valves and you could also go with larger valves..

If I had the money I would get a teksid block and send it out to be bored/sleeved then I would assemble the engine myself, but I don't have money so stock I stay for now

01Steeda · Aug 10, 2006

svttech76 said:
Sure it's cheaper to stroke our motors, but what they really need is more bore. Our bore /stroke ratio stock is worse than a 347 stroker 5.0

the reason a larger bore is better is because it unshrouds the valves and you could also go with larger valves..

If I had the money I would get a teksid block and send it out to be bored/sleeved then I would assemble the engine myself, but I don't have money so stock I stay for now

every word true.

My 5.4L fox project is going really slow, but I planned it that way...

I am getting a iron block darton sleeved, mainly because the cost of an alloy aluminum (sp? lol) block is rediculous. Bore is 100x better for our engines than stroke. If you have the money for the teksid... get it and go for it. youll make big power.

Mike97gt · Aug 10, 2006

01Steeda said:
every word true.

My 5.4L fox project is going really slow, but I planned it that way...

I am getting a iron block darton sleeved, mainly because the cost of an alloy aluminum (sp? lol) block is rediculous. Bore is 100x better for our engines than stroke. If you have the money for the teksid... get it and go for it. youll make big power.

at somepoint I will have the money. Not having to pay to have the motor assembled will save me a few bucks on it. Whats really holding me back is the machining cost and sleeve cost..

blackfang · Aug 10, 2006

svttech76 said:
Sure it's cheaper to stroke our motors, but what they really need is more bore. Our bore /stroke ratio stock is worse than a 347 stroker 5.0

the reason a larger bore is better is because it unshrouds the valves and you could also go with larger valves..

If I had the money I would get a teksid block and send it out to be bored/sleeved then I would assemble the engine myself, but I don't have money so stock I stay for now

Exactly!! If I recall, Nazman gained 50 rwhp with just a big bore kit.

can i get an iron 4.6 block bored out?

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