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HybridZ

396 sbc


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Ill try and keep this updated as parts arrive.

 

Currently waiting on the rotating assembly, scat 1-40900-Bi

 

4340 3.875 stroke 6" H-beam rods and forged pistons 11.4:1 compression

 

Heads are world products sportsman II built to hell with a complete lunati valvetrain max lift is .660

 

Hedman headers

 

Msd 8691? I think pro billet dizzy

 

Edelbrock tunnelram with dual 1403 carbs and enderle scoop

 

(Carbs will probably be swapped for holley 450s)

 

Cam is .241/.249 @.50 and .525 /.541 lift 110lsa 106lcl

 

Block is arp studded through out

 

Block Is a 4bolt main 010 high nickle content

 

Pic is of mockup, tracing out gaskets and removing paint for good sealing

post-18667-0-47136500-1360637248_thumb.jpg

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Th350 most likely. Probably 4.11 if I can find a set for cheap. My friend just sold the ones he had. If not ill settle for a 3.90

 

Im in the process of getting my 240z finished up as well. I however have a lil 355 sbc with a Mustang T5 WC and 4.11 R200 diff. Hopefully it all works well together and makes the car a whole lotta fun. 

 

Why run a TH350 and not a 700R4? 

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Valve train photo, part numbers if anyone is interested.

 

 

73925-16 Springs

75794-16 Retainers

77048-16 Locks

78518-16 Seals

86731-16 Locators

 

#73925 Dual Valve Spring

 

1.306" O.D.

0.676" I.D.

153 lbs. @ 1.810" Seat Load

400 lbs. @ 1.150" Open Load

0.660" Maximum Valve Lift

 

Pushrod guides are 5/16 raised made by allstar performance. They are 18$ on summit.

post-18667-0-52495800-1360803791_thumb.jpg

Edited by Robftw
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Robftw:

 

Which block, GM or aftermarket?

Piston manufacturer?

Rod manufacturer?

Crank manufacturer?

Cam manufacturer?

Hydraulic or Solid Roller Cam?

Rocker Arm Ratio?

What block machining?

 

Just curious!

 

Gm

Je

Scat

Acat

Lunati

Hydraulic flat tappet

1.5

.030 overbore and I will clearance it myself

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(1) YOU can control to a great degree the amount of torque your applying to the tires by controlling what your foot does on the throttle petal

(2) proper tires and suspension mods like modifying air pressure in the tires air shocks, traction bars etc.can be very useful but simply learning how to drive the car and how and when and at what rate you can apply power helps a great deal, that takes practice and experience.

Ive built and raced dozens of cars, each is unique and each takes a slightly different drive style, each car will require you to master its flaws and strengths and it makes little difference if its a 400hp street/strip car or a 700hp strip car, your knowledge of how to set up a suspension, recognize how the suspension and tires work together, and work with the cars limitations will make or break the combo to a large extent

http://forum.grumpysperformance.com/viewtopic.php?f=71&t=372&p=454&hilit=physics+of+racing#p454

http://forum.grumpysperformance.com/viewtopic.php?f=80&t=906&p=27083&hilit=learning+drive#p27083

http://forum.grumpysperformance.com/viewtopic.php?f=50&t=248&p=295&hilit=needs+500hp#p295

http://forum.grumpysperformance.com/viewtopic.php?f=87&t=5121&p=14750&hilit=launch+traction#p14750

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Saved 500$ going with an eagle crank, its .10 undersize on the rods.. factory regrind.

 

Machine shop checked it out and saw no flaws, I'm happy.

 

I might switch my rods over to scat I beams because the h beams are bigger in an already really tight fit.. we'll see in the next few weeks what happens.

post-18667-0-82115100-1361994216_thumb.jpg

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  • 4 months later...

Alright time for a huge update, part's have been arriving and im going to assemble this on tuesday.

The parts list has changed a little bit since i first started this thread!

Scat procomp rods:

WYjSzkl.jpg


Mahle forged coated pistons:  These only weigh 395 grams each!

MIw86NF.jpg

 

Super Victor intake, i'm replacing the tunnelram

Jg7X0F4.jpg

 

Painting of the block:

fxkCnrw.jpg

 

Had the pan rail clearanced so my crankshaft would fit:
 

tBT7qMm.jpg

 

oYkhtvk.jpg

Edited by Robftw
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Studded the block with ARP goodies, You can see where klispies had to lighten the crank in this photo. Every counter weight has some material cut off.

Hvf2k87.jpg

Everything In place, torqued down.

God damn i hate measuring bolt stretch..

yXoeVU4.jpg

Gaskets and more ARP studs

Wzuvzqw.jpg

Last picture i took, The heads have since been torqued down and i'm about to visit home depot for oil pan bolts / balancer bolts & waterpump bolts

Cki80hB.jpg

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  • 2 weeks later...

Im curious of what intake runner size you have on your heads, and the lunati part number for your cam?

 

I've got a very similar built motor in my 260z and i will say it really get up and goes and i can't even use its full potential because of some clutch issues i have, having a th350 being built right now actually

 

My motor is a 383 11.3:1 AFR195 237/242@.050 .605/613 lunati solid roller QFT750 and RPM air gap, but may switch to a Victor Jr.

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Im curious of what intake runner size you have on your heads, and the lunati part number for your cam?

I've got a very similar built motor in my 260z and i will say it really get up and goes and i can't even use its full potential because of some clutch issues i have, having a th350 being built right now actually

My motor is a 383 11.3:1 AFR195 237/242@.050 .605/613 lunati solid roller QFT750 and RPM air gap, but may switch to a Victor Jr.

200cc intake runner 63.5 cc head. Ill be getting afr 210s after tax season.

 

Cam is a hyd flat tappet .525 / .546 and I don't know the duration off hand, I think the part number was 10605

 

I'll be going with 600+ lift solid flat tappet whrn I swap to afr's

 

right now im limited due to my heads

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Recommendation to go to solid roller lifters is very good.  Go with CompCams EDM machined in oiling holes in the solid lifters.  Then a more aggressive camshaft may be used.  This would be a good complement to the AFR-210s and 396 short block.  Don't need TOO wild a camshaft.  Something with the best amount of area under the HP and TQ curves.  Pay close attention to the valve springs used.

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