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Old 29th-November-2012, 10:44 AM   #16
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After speaking with the cam guys and my engine builder again, 3/8's push rods are the way we are going to go as we can offset the rockers by T&D
You might be able to do like my buddy did and clearance the heads(depending on your heads), which is what he did on his Brodix heads. I would want a 3/8" pushrod in there with that kind of lift which means a pretty strong spring as well.
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Old 1st-December-2012, 11:09 PM   #17
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Well u got a few opinions on here so u stick n with your list ?
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Old 3rd-December-2012, 12:43 PM   #18
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11/32 by Manton is also a good option when you don't have alot of room.
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Old 3rd-December-2012, 01:15 PM   #19
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push rods

I would go with the larger as well, and if you have to by the rockers and lifters, go with an offset set and you will have more clearance, and the ability to go with a larger set of heads (235-245 ) with a wider port at the pinch point of the port for more power. Frank
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Old 3rd-December-2012, 11:04 PM   #20
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I would go with the larger as well, and if you have to by the rockers and lifters, go with an offset set and you will have more clearance, and the ability to go with a larger set of heads (235-245 ) with a wider port at the pinch point of the port for more power. Frank
I have ordered the Shaft rockers with an offset and Lifter with an offset as well to accomadate the 3/8's push rods. I have the Heads all ready...However with some porting work on the heads and intake we saw 305 @ 700 and 235 @700 exhaust. Pac has supplied the springs 265 at 1.9 install height on the seat and 805 open with titanuim retainers
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Old 3rd-December-2012, 11:06 PM   #21
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Well u got a few opinions on here so u stick n with your list ?
Only going to change a few things...but mostly have everything so can't change too much...I feel my limiting factor will be heads and intake but I'm interested to see with some medium port work if I can make around 600hp n/a and close to 1000hp on the bottle...
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Old 8th-December-2012, 02:21 PM   #22
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Okay so, I went with T@D for the rockers and they are setting me up with 250 offset and from some quick measurements I will be able to run a 3/8 intake and a 7/16 exhaust push rod... looks like I will have a pretty well built setup. I have compared some more numbers on my heads with other very competitive heads and my numbers are comparitive, I'm excited to see If I can make my goal even better then originally forecasted. I should have the engine together in the new year...Hopefully early in the new year!

I will update as we make small strides.
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Old 18th-December-2012, 04:09 PM   #23
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Okay All, So I did Change a few things over the engine bulid!

Headers are Dougs 1 7/8 to 3.5 inch collector, non slip on
Went with a bullet custom grind cam
T@D 1.6 rockers
3/8s intake push rod
7 1/6s exhaust pushrod
Crower .150 offset bushed lifters
Trick Titanium Valves
Meziere 55GPM Elec pump
Oil Accumilator
Moroso Vac Pump
11.6 CR now with Cam changes
And a couple of other good trick things
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Old 20th-December-2012, 04:30 AM   #24
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Old 20th-December-2012, 05:21 AM   #25
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^^This!!!
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Old 21st-December-2012, 12:05 AM   #26
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You will not be able to use 3/8 push rods, 5/16 .080 Manley or Smith bros would be the required option.

Comp roller lifters (buyer be ware) Herbert (Morel) will be your best option.

Edelbrock heads? NOT! Brodix or Dart with the HD decks will be your best option and performance.

Comp cam?

Eagle crank, it is a good crank, Same Money you can get a better Manley 4340 none twist steel crank.

Al
I don't understand about your coment on the push rods. I use 3/8 in mine?
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Old 21st-December-2012, 11:19 AM   #27
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I don't understand about your coment on the push rods. I use 3/8 in mine?
Small block heads that are (In most cases) over 165cc intake runner will not have room for a 3/8 pushrod.

And when over 210cc even with offset rockers and lifter your still limited to 5/16.

5/16 .080 wall pushrods can handle the job with ease.
And they are lighter.
Anything more is a waist of money and will not help performance. If anything the added weight could rob HP.

Some heads are notched for larger pushrods, this does effect the intake port air flow.


Al
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Old 21st-December-2012, 02:14 PM   #28
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Mr Dealer when it comes to a 427 sbc and n20 your going to want alot of CSA in whatever head you choose!!
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Old 22nd-December-2012, 05:40 PM   #29
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I will have a pile of pics to post once the engine is back together for good! We have changed some stuff as mentioned! I have a time booked for early in the new year to put the engine on the engine Dyno so I can get a proper baseline to start with.

Thanks to all for their advise
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Old 26th-December-2012, 03:20 PM   #30
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i think if i really wanted a tough nitrous motor ,, i'd do a 406 with a 5.85 rod , ring placement could be better , thicker crown on the piston , but thats me
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