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Old 10-28-2004, 00:58   #1 (permalink)
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4V 351 spec

Hi Guys,

Ive watched and enjoyed your forum for a while, this is my first post.

Im looking for opinion for a motor im currently building:

4V 351 +30, solid cam 575/600 lift, 247/257 @50, 107 lobe sep, shot peened rods with ARP bolts, 4MAB crank, 10.5: 1 comp with 4V closed chamber heads on PULP.
Useage will be street/strip, 6500 rpm limit, looking for 480-500HP.

My dilema is 3 fold:
1) What piston will suit my application without going over board?
2) What is the best inlet manifold to suit? ive got a 4V torker at the moment, will it do? or do i need to go bigger?
3) should i use inlet tounges on these heads?

Any advice would be appreciated

Thanks.
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Old 10-28-2004, 02:52   #2 (permalink)
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Re: 4V 351 spec

Hi 4Vman, welcome to the forums, in my opinion :
1) TRW flatops
2) Torker should be fine
3) Inlet tounges should help, but i don't think you NEED them, my 4v's go fine without them.

What about the rest of your specs , what car, carby, gearing stall ..... ? do you have.
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Old 10-28-2004, 03:15   #3 (permalink)
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Re: 4V 351 spec

Thanks for the info,

Do you use a similar combo?
Are port tounges over rated?

its a spare motor, but will probably end up in my XBGT or XYGT, both are manual, 3.7 gears, 750 HP series Holley etc,
Thanks.
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Old 10-28-2004, 04:37   #4 (permalink)
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Re: 4V 351 spec

My ports are actually ported !, but i have 4:88 gears which helps the 4v's down low.
I have not tried tounges myself, but i hear they are good for windspeed.
My combo is similar, except i have a 850 dp, and a much bigger cam.
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Old 10-28-2004, 06:41   #5 (permalink)
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Re: 4V 351 spec

Welcome 4Vman - sounds like you have a great project happening there!
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Old 10-28-2004, 19:28   #6 (permalink)
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Re: 4V 351 spec

1) What piston will suit my application without going over board?

TRW 2379F Forged Flat Top 10.5:1 with 63cc heads seems to be choice

2) What is the best inlet manifold to suit? ive got a 4V torker at the moment, will it do? or do i need to go bigger?

Torker is good but have heard the X-Cellerator is more responsive off the line. Smaller ports and longer than the Torker

3) should i use inlet tounges on these heads?

If u want. I have a tongue inlet plate from Active Performance which bogs the bottom off. Haven't tried them yet. Others also sell alloy or epoxy tongues u need to grub screw.

Good luck.

Hopefully with a C4 - 4000 stall and LSD 4.0:1 with 26*8.5*14 MTs u do a 11.99 sec quarter. That's what I'm aiming for with mine !!!
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Old 10-28-2004, 20:22   #7 (permalink)
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Re: 4V 351 spec

Thanks for your help,
what are peoples opinion of ACL pistons? Both the duralite and Racer series.
Forged pistons seem a bit over the top for an engine that will be in a weekend street car? or will the HP figure im looking at make it manditory,
Thanks!
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Old 10-28-2004, 20:50   #8 (permalink)
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Re: 4V 351 spec

Your compression is really borderline for pistons that aren't forged. Most non-forged pistons state a safe compresion ratio as 10:1 but you can get away with 10.5:1. I am sure ACL states this on their website too.

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Old 10-29-2004, 07:50   #9 (permalink)
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Re: 4V 351 spec

not an expert but id go the inlet tounges for the low down torque and since its "only" going to be revved to 6500rpm. didnt the xy gtho's rev to 7500rpm down conrod?

also heard the x-cellerator is an excellent manifold, everything ive read to do with it has given it a thumbs up, and would be very suitable for the 6500rpm limit
the torker obviously would work but if u can find an x-cellerator at the right price i would go for it. either way u go port matching would help.

re-reading ur post i noticed your power goal which is very realistic indeed.
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Old 10-29-2004, 23:16   #10 (permalink)
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Re: 4V 351 spec

The torker will be fine for what you want to do. I personally chose the TFC because of it's top end capabilities.

I have installed port toungues, even NASCAR motors that revved to 8000rpm still had their ports filled in. It greatly increases air velocity.

I found that the ACL race series piston to be quite good, but as said earlier there are forgies out there which aren't bad. I would go for a 6" 302 rod on your 351 crank and use a SRP forged alloy piston, they go for approx $800-900 and will give you 357ci at 30 thou with 10.3:1 compression with a 64cc 4V closed chamber head. big HP potential.

You have some good pieces there? (carb etc.) With that crank, maybe a set of 6" forged rods ($600 or so) and maybe consider solid roller, you can aim for 500-550hp.

Best of luck mate, cant wait to see it happen. Mine is almost there and i just cannot wait to hear her for the first time...

shane
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