700hp 351w 69 block or 94 roller block

[fox3streetracer]

in the future i plan on building a 418 or 427 stroker for my street car.will be carbed with possibility of a vortech s-trim blow through@10psi or 150 shot nitous.was going to get a all forged stroker kit.engine will never see above 6200rpm.i am going to run a hyd roller cam.i can get ahold of a 69 351w block or a 94 roller block for the same price,was worried that the main seal design would leak more on the 69,also worried about the lower deck height with stroker kit and p/v interferance.also,will a regular 9.500 deck height intake work with the 69 9.480 deck height?would the roller block handle 650-700hp?both the blocks are stock bore and in very good shape.

 

[Redrooster]

I don't have any direct experience with a windsor engine; however, a friend has a 393 in a 69 block. The same question was asked to his engine builder as the retro roller lifters are expensive. The builder stated that the late model roller windsor blocks are weak compared to the early model and are not good for anything other than a mild build.

 

[Modular2v]

I just recently got a 69 block for my next build up. i would get the 69 just because it is stronger than the 94 due to higher nickel content

 

[Stangninjak]

I just recently got a 69 block for my next build up. i would get the 69 just because it is stronger than the 94 due to higher nickel content

What Mod2v says is true. I ran a 69 block, and now I have a 94 block. The 69 block will be stronger, and yes the intake will fit with no problems. I was able to fit my old intake from the 69 to the 94, even though I decided to upgrade later.

The roller block, 94, can handle that power easily. Its your lower end that needs beafing. If you are getting the forge stroker kit, you should not have a issue going with the roller block. If you can get the 69, I would say use it, and convert it to a roller if you are building it up from stroke kit. It may cost more, but 69 blocks are dam near indestructable.

I basically went with a 94 block in my new build basically because the machine shops around my parts are shady at best. So I basically just got a new short block because I needed to get the engine up quickly, and it was about the same cost.

In truth you really cannot go wrong with either one of those blocks. 94 is the next best block behind the 69 in a 351w

 

[Modular2v]

i already drilled my intake valley for the spider....it is easy to do! Either way you go you should be fine...i just wouldnt push the 94 over 600hp, but that is coming from a guy that is getting ready to push 550 through a stock 302 block

 

[fox3streetracer]

ttt

 

[Rick 91GT]

I would recommend a solid roller in the older model year block. The biggest issue with boost on the large cube strokers is compression, in 9 out of 10 cases a custom piston is needed...just food for thought. I am dealing with this with a customers 434ci stroker

 

[Modular2v]

I would recommend a solid roller in the older model year block. The biggest issue with boost on the large cube strokers is compression, in 9 out of 10 cases a custom piston is needed...just food for thought. I am dealing with this with a customers 434ci stroker

how much more is this rick?

 

[Rick 91GT]

Rotating assembly would be in the $2000 range, custom pistons, crank, rods, pistons, rings, bearings, etc

All good name brand parts, no off shore junk.

 

[Modular2v]

why the custom pistons? because of the deck height?

 

[bluevenom867]

why the custom pistons? because of the deck height?

Compression hieght of the piston.

You make these big stroke motors,with long rods you need a short piston and a crappily (word?) made piston is junk and will also usually give you too much compression ( assuming flat top).

Anything serious I would deffenitly go with custom pistons,its just a litle extra saftey and can even hel pyou make a little more power,as alot of custom pistons can be ordered with special work done (like gas porting,lightening,modified pin oiling,and of course the best ring land and crown design for your app.).

They cost a few hundred more than off the selfers.

 

[onefaststang]

Go with the 69 block. There are a lot of people who will tell you the late model blocks are strong enough but I disagree. I've been one of the un-lucky people to break one, and it cost me a LOT of money in the long run.

 

[Rick 91GT]

Compression Height and the Dish size...

Here is a typical 408ci stroker below, as you can see even with a 20cc dish the compression is still high.

Compression Ratio Calculator v2.d

Wednesday, April 12, 2006 7:44 am

* 408 cid *

Bore Size: 4.030
Gasket Bore: 4.100
Piston Top Land Dia: 3.995
Stroke: 4.000
Connecting Rod Length 6.200
Compression Height: 1.300
Deck Height: 9.500
Ring to Top of Piston 0.250
Gasket Thickness: 0.040
Valve Notches Volume: 20.00
Dome Volume: 0.00
Volume Head: 58.00
-------------------------------------
:COMPRESSION RATIO: 10.549
-------------------------------------



calculation variables:

Piston to Deck: 0.000
Crank Throw: 2.000
Vol. Above Top Ring: 0.90 cc
Piston to Dec Vol.: 0.00 cc
Gasket Volume: 8.65 cc
Volume Clearance: 87.56 cc
Cylinder Volume: 836.10 cc
CID: 408.018


(notes/messages)

× Piston Flush with Deck



I agree 110% with JR, although most guys do not listen.....