New build input

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New build input

Post  rollercam1 on October 14th 2017, 1:29 pm

Morning all. I am looking for input into a new build that I am putting together for my brothers new bracket car. I have spent the last couple of hours reading through the proven build threads and think I have a good idea but would like your input and maybe some "look out for this" type things. The car is an 89' mustang, track only, 1/4 mile. 28X10.5 tire, with stock style rear suspension. Trans is open, but more than likely a glide. As I am the guy that is going to have to maintain this program and have two other programs that I manage throughout the season. I would like the valvetrain maintenance to be relatively low. I.E. check springs, lash every 30 passes, refresh engine 300'ish passes. I would like it to run low 9's and I think that is an attainable goal to reach. The only parts I have now are a set of P-51 heads that are new in the box. Here is my thoughts on the engine,
Eliminator sportsman block - 4.440" bore X 4.300" stroke.
Victor intake - dominator carb 1200cfm / open to a tunnel ram as well
shoot for around 13:1 compression.
Kaase oil pump, good pan with windage tray
Vacuum pump at 10-12 inches
P-51's with T&D shaft rockers
Solid roller cam with as good as a pushrod that I can fit.
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Re: New build input

Post  cool40 on October 14th 2017, 1:34 pm

Looks like a good plan. Good lifters and stay on top of the lash a little more IMO and you should be good to go. Smile
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Re: New build input

Post  rollercam1 on October 14th 2017, 1:42 pm

Any brand specific lifter? I am thinking Morel
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Re: New build input

Post  cool40 on October 14th 2017, 2:05 pm

I have great luck with crower but I've heard nothing but good about Them.
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Re: New build input

Post  BBFTorino on October 14th 2017, 5:08 pm

You may not need the Eliminator block. A good prepped factory block, like say a D0VE-A with the thicker main webbing can handle the duty it takes to push a Fox into the low 9's....and cost much less!!

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Re: New build input

Post  rollercam1 on October 14th 2017, 8:02 pm

I agree that an eliminator block is not necessary. However, if it is decided to make more down the road, the block won't be a weak link.
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Re: New build input

Post  rmcomprandy on October 15th 2017, 9:56 am

There are many testimonials as to what CAN be accomplished with an O.E.M. production block however, upgrading to a better block will never do any harm. Unless cost is considered harm.

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Re: New build input

Post  rollercam1 on October 15th 2017, 11:48 am

I am looking at a scat rotating assembly 1-47608BI. CP flat top pistons with 6cc valve reliefs, 4340 forged crank and rods. ARP8740 rod bolts. Am I going to be better off with a diamond pistons cut for the P-51's? With a 0 deck I can get close to 13:1 but I might have to mill the head to get more compression with the CP pistons. In theory that should yield some small cfm increase in the head by un-shrouding the valve correct? I don't mind sourcing each piece of the build individually, however, I live in Alaska and you can add 25-30% increase in budget due to shipping. For a reference, it costs 70-80 dollars to ship a cam, 200 to ship a set of heads, 50 to ship pushrods. It adds up quick, but the costs still won't outweigh the costs of inferior parts destroying an engine. I thank al;l you guys for the time and assistance.
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Re: New build input

Post  DanE on October 15th 2017, 3:15 pm

If you are going to an Eliminator block, why limit the bore to 4.44"? 4.5', 4.56", 4.6", whatever, would help increase compression and power production at little, if any, reliability issues.

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Re: New build input

Post  rollercam1 on October 15th 2017, 4:34 pm

I believe the sportsman block max bore is 4.500" / 4.440" would give a few clean-ups down the road. Please correct me if I am wrong
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Re: New build input

Post  Dave De on October 15th 2017, 7:14 pm

My package is similar to what you want to do. It should get you into the high 8's I would think. I've been mostly 9.0s this year thru a full exhaust in cool weather and dont have a good pan or a vacuum pump. My top end is reliable with Morel lifters, T&D rockers, PAC springs and TI retainers. I did a 300 mile drag weekend trip this year without issues. The valves dont need much attention with about 50 passes between checks. I love those T&D's.
Other differences, I am 13.5 compression on E85 and 4.530 x 4.500 bore/stroke using an older 10 bolt A460 block.
I should be sneaking into the 8's for good next year by tuning up some mis-matched parts. I like everything that you are doing but you should go 4.500 bore to start or pick a block that can go to 4.600. There will be allot of room to bore out in the future. If you are budget minded then start at 4.440 bore for a catalog piston to save money.
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