4.6 strokers?
- Thread starter nitrous408
- Start date
Malevolyn
New Member
03ghoststang
Well-Known Member
look up www.vtengines.com
and www.modularperformance.com
for info on 5.0 strokers/big bores and 324ci big bore-strokers.
and www.modularperformance.com
for info on 5.0 strokers/big bores and 324ci big bore-strokers.
big bore is the way to go on the mod motor. our bore to stroker ratio is way too far in favor of stroke already... in fact a 347 CI 5.0 based motor has a better bore stroke ratio than us.
stangGT97
New Member
big bore all the way... the valves in the 4.6 heads are shrouded because of the stock bore size, increasing the bore is a sure way to make some real power. btw, check your grammar, my head just exploded trying to read your post
03ghoststang
Well-Known Member
blackfang
Founding Member
You are talking about a pushrod motor. We are talking modulars. two different engines and our stroke is damn near the same as a 351 c.i Our bore is very small in relation and that is why Modular motors respeond well to a big bore set up. How will the big bore put stress on the block when it is resleeved? Please explain your comment as this is the very first I have ever heard of a Big Bore putting stress on a block.TweekedGT said:
blackfang
Founding Member
blackfang said:
You cannot make a 2V block into a big bore. You can only use the Cobra aluminum blocks. Check it out. VT only does Cobra blocks exchange. The most you can bore out a cast 2V block safely is .030 over, the cylinder walls are too thin. I've done a hell of a lot of research.
blackfang
Founding Member
TweekedGT said:
Actually you can big bore an iron block, but it must be wet sleeved. This process is somewhat cheaper than using an aluminum block, but the Darton M.I.D. sleeves needed are in scarce supply and can cost ~1,500 dollars alone.
However, most people rather use the aluminum blocks and they either dry sleeved (which can handle up to 20 psi and good for a mild blower set up or NA) or wet sleeve it as well.
Our stroke in stock form is 3.5" which is the same as a 351W which has 73 cubes more. The Big Bores go from a 3.5" to a 3.7" bore which benefits the DOHC motor.
I think it is safe to assume that the topic is about 4V's
Now that we have established that we are referring to the DOHC, again, why is it not safe to make a Big Bore and why do we not need it?blackfang said:Actually you can big bore an iron block, but it must be wet sleeved. This process is somewhat cheaper than using an aluminum block, but the Darton M.I.D. sleeves needed are in scarce supply and can cost ~1,500 dollars alone.
However, most people rather use the aluminum blocks and they either dry sleeved (which can handle up to 20 psi and good for a mild blower set up or NA) or wet sleeve it as well.
Our stroke in stock form is 3.5" which is the same as a 351W which has 73 cubes more. The Big Bores go from a 3.5" to a 3.7" bore which benefits the DOHC motor.
I think it is safe to assume that the topic is about 4V's
A 4V is a different ball game. No machine shop or engine builder I have talked to will sleeve a 2V motor. 4V for sure they will. The best thing you can do is square off the motor. 3.75 stroke, 3.75 bore. With my 2V stock block no machine shop would do anything more than .030 over. Now that I have mine in it really hauls ass compared to a regular 4.6. If your going with an exotic block by all means, bore away. But as it sits, a 2V mod motor cannot be big bored, that's what i was saying. Not that you shouldn't do a big bore. Go with a Sean Hyland 370 Cubic inch block for $4000US if you want. If I had the cash, that's what I would have done.
jstreet0204
Active Member
On the subject of stoker vs big bore. If you compare the two at equal displacements, the big bore will make more power, rev higher, and be lighter than a stroker. The big bore will unshroud the valves and places less stress on the rotating assembly.
the iron block CAN be sleeved but the process requires the use of the Darton MID sleeves and the machine work required is not for your average engine machine shop. Sleeves and machine work will cost at least 2500.00.
the iron block CAN be sleeved but the process requires the use of the Darton MID sleeves and the machine work required is not for your average engine machine shop. Sleeves and machine work will cost at least 2500.00.
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