stroker options

keane · #1 (**permalink**) 04-20-2004, 07:26 AM

Hi to all me again!! I need some more feedback on stroker setups, I know there are lots of people running all sorts of combinations, one I was looking at using was 4.140/6.7/keith black 33cc dish/ +60 block, I have some new edelbrock performer rpm heads (75cc) and will use either rpm cam kit or similar regardless of which combi I go for. It appears that I cannot get forged +60 pistons to suit the above setup unless someone can point me in the right direction? I also have the option of using a 4.500 crank/6.700 rods, but again it seems the piston choice is limited( +30/+80) appears to be common (Probe) etc THe devil in me wants to go with the biggest combi and have something almost unique over here!! Any info on forged piston availability gratefully received. Thanks Dave Keane( away for a week 21/04-28/04 so if no reply thats the reason)

djseed · #2 (**permalink**) 04-20-2004, 07:59 AM

I have the 501 kit in my 429 SCJ. I used the KB hypereutectic pistons and the 33cc dish. The Kaase SCJ heads with the 72cc chambers and the 6.7" rods yielded a 9.94 to 1 compression with a +30 block and +5 on the deck. I built a street engine to run on pump gas. I used the Crane roller hydraulic cam and roller lifters with the Kaase valve stud girdle. With the RPM manifold it made 525 HP and 600 Ft Lbs. Power peaks at 5800 and you can drive it at 1500 all day. The builder wanted me to go for more HP but I wanted a daily driver. I have photos of the block and oiling system in my gallery.

http://www.clubcobra.com/photopost/s....com&password=

Tom Wells · #3 (**permalink**) 04-20-2004, 11:31 AM

Hi Dave,

What David said

I use the Ford crate 521 setup: 4.30" stroke, 4.39" bore. With probably the same cam setup minus the girdle. Street use is my goal too and very happy with 412RWHP through a C6.

The CR is 9.8:1 but I haven't the foggiest about the dish. It has 6.605 rods (stock length).

Go for it

Regards,

Tom

PS: Just got it back with the new body and it's doing great at 8,500+ miles!

PPS: Do NOT use hypereutectic pistons - use only forged ones - I've seen reports of bad thimgs about the former.

keane · #4 (**permalink**) 04-20-2004, 12:38 PM

Thanks DJ/Tom, DJ what is the part number of the cam/lifter you are using? Tom If you are using a 4.3 stroke/ std rods? what pistons are you running? Dave

Tom Wells · #5 (**permalink**) 04-21-2004, 06:46 AM

Hi Dave,

I knew you were going to ask me that! The pistons are the ones that came with the Ford crate motor, so perhaps the Motorsport catalog would be a place to look. I'm on the road right now and mine's ~400 miles from here - sorry. The rods are Scat/Eagle H-beam, as the original Ford "truck" rods were literally garbage.

The cam is the most aggressive Crane hydraulic roller I could find at the time: P/N 359351, with their hydraulic rollers. Expensive but I'm very happy with it

If you go to a steel cam (the roller cam is steel), get the matching steel distributor gear from Crane and pay very close attention to its location vertically on the distributor shaft!

If you still need the piston ID a couple of weeks from now, please give a shout.

Regards,

Tom

djseed · #6 (**permalink**) 04-21-2004, 08:58 AM

I am using the same Crane hydraulic roller cam as Tom along with the Crane Gold roller rockers. I also used the Crane steel distributor gear with the steel cam. I wanted to use the 6.8" rods and that would have worked with the Ebrock 95cc heads. Instead I chose the Kaase SCJ 72cc heads and this forced me back to the 6.7" rods to get the desired compression ratio. I didn't go with a bigger stroke because I liked the better rod/stroke ratio on the 4.14" crank. It also gives better clearance between the oil ring and the pin because the piston is a bit taller. I chose the KB hypereutectic pistons because they are better for street use. You can run tighter clearances to improve sealing and reduce piston and ring wear. Many OEM HP engines use hypereutectic pistons today. If you intend to build a race type engine with high compression, lots of revs, wild cam, blower, turbo or NOS then you should use a forged piston. I am always surprised that cobra owners install a front sump oil pan. These are designed to clear the front suspension on production cars. On my SPF, the front suspension does not interfere so you can run a flat type Marine pan. It holds more oil, has better road clearance and runs a centre pickup. I also added the 3 qt Accusump.