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Old 02-17-2006, 10:53 AM
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377,406, or 421?

Whitch would you build and why ?with the following parts.


Pro top line 220CC alum heads, 64cc chambers, mildly ported and a comp valve job 2.05X1.60

400 sbc block 4 bolt main

Lunati pro mod 4340 6" rods

Edelbrock(super)victor JR intake

I can go with a 377, a 406 or a 421, the car is a 74 nova, w/ richmond 4.10 rear gear, mini spool, th350 and a 8" 4000-4200 stall(w/anti ballooon plates) as of now with a 11.5:1 327 im getting about 3800 out of the converter.. on the footbrake.


I like the 377's, and the 406's but I havent built a 421, Im going to use the pro topline heads, and the Super victor intake, my intent is to go 6.5"s or faster in the 1/8. N/a

Im also going to use nitrous later, I have a zex perimiter plate system that is good for up to a 300 shot.



I have stressed over this long enough, help me decide whitch stroke is best for what I have.


2wld4u

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Old 02-17-2006, 11:44 AM
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If you're just concerned with the quartr mile I would go with the longer stroke 421. The added displacement will give you more overall torque. this however would be counterproductive in early circle track racing since the added torque can often break you loose on the corners. You can make the same power at lower rpm with more displacemet- which usually means that the torque curve will be more healthy.
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Old 02-17-2006, 12:27 PM
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Quote:
Originally Posted by ap72
If you're just concerned with the quartr mile I would go with the longer stroke 421. The added displacement will give you more overall torque. this however would be counterproductive in early circle track racing since the added torque can often break you loose on the corners. You can make the same power at lower rpm with more displacemet- which usually means that the torque curve will be more healthy.

Thats what im thinking as well, Im was thinking of a Scat 4340 3.875" stroke, with the 6" rods, Flat tops, any idea where I should start with the cam timing? I plan on running a solid roller...


2wld4u
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Old 02-17-2006, 12:59 PM
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With the standard 400 block you may run into clearance problems with a 3.875 crank and the standard cam tunnel location. Something to consider. Not saying it won't clear but it'll be close. Most people use a "little M" block for that configuration. Also the oil pan rails and of course the oil pan will need notching.

Last edited by engineczar; 02-17-2006 at 01:06 PM.
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Old 02-20-2006, 04:53 PM
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Quote:
Originally Posted by engineczar
With the standard 400 block you may run into clearance problems with a 3.875 crank and the standard cam tunnel location. Something to consider. Not saying it won't clear but it'll be close. Most people use a "little M" block for that configuration. Also the oil pan rails and of course the oil pan will need notching.
ACTUALY, I have decided to go with a 4" stroke, to make a 434 cid.


2wld4u
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Old 02-20-2006, 05:40 PM
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H-beam rods with 3/8" bolts, machined for use with a stroker crank wouldn't work with a 4 inch crank in a stock block. There's just not enough room.

A 3.8" crank will work with the clearancing mentioned before, grinding the rods and using a small base circle cam. 3.875 if you use rods with a smaller "big" end.


Larry
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Old 02-20-2006, 06:35 PM
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Quote:
Originally Posted by coldknock
H-beam rods with 3/8" bolts, machined for use with a stroker crank wouldn't work with a 4 inch crank in a stock block. There's just not enough room.

A 3.8" crank will work with the clearancing mentioned before, grinding the rods and using a small base circle cam. 3.875 if you use rods with a smaller "big" end.


Larry

im using lunati pro mod rods, and i have checked, it will be tight but it will clear. I will need a small base circle cam, and it doesnt look to need any more clearancing than the 421, now i just need to find a dish piston for the 434, w/flat tops ill have a tad more c/r than i need

2wld4u

ill try to put up some pics of this build soon!
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