572 to 598 questions

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572 to 598 questions

Post  71maverick on January 1st 2013, 10:05 pm

Quick rundown..2700#(w/d) 1/8th mile bracket car... Currently have a eliminator block.blue thunder head 572 with runnel ram and 2 terminators...4.600 bore 4.300 stroke 6.800 rod... Im looking at going to Aheads and making some changes this winter... Here are my ?s id like some advice on..

On a new cam is it worth doing the cylinder swap??? Pros/cons??

If i dont get Aheads and stay with the blue thunders. Is it worth making a mold for the new pistons? Or just get another set of shelf pistons from diamond??

Im going to a 4.5 stroke... Is it bad to stay with the 6.8 rod??

Thanks
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Re: 572 to 598 questions

Post  cool40 on January 1st 2013, 10:08 pm

pistons should'nt be hard to get without doing the mold.i'd keep the 6.8 rod too. Smile
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Re: 572 to 598 questions

Post  Lem Evans on January 1st 2013, 10:14 pm

What's the CCs of the BT heads?

6.800" rod is fine.

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Re: 572 to 598 questions

Post  71maverick on January 1st 2013, 10:16 pm

They have beem played with and had some milled... I think that they are 84cc right now but inwill have to check to be sure
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Re: 572 to 598 questions

Post  Lem Evans on January 1st 2013, 10:20 pm

Comp ratio target? I'd doubt you would need a 'mold' of the chamber.

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Re: 572 to 598 questions

Post  cool40 on January 1st 2013, 10:21 pm

how much compression you look'n for?
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Re: 572 to 598 questions

Post  71maverick on January 1st 2013, 10:34 pm

Id like to stay in the 14 range
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Re: 572 to 598 questions

Post  cool40 on January 1st 2013, 11:53 pm

71maverick wrote:Id like to stay in the 14 range
14 should'nt be a problem with 4.5 crank.
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Re: 572 to 598 questions

Post  71maverick on January 1st 2013, 11:59 pm

Whats your thats on the cylinder swap? Dont reinvent the wheel??
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Re: 572 to 598 questions

Post  cool40 on January 2nd 2013, 12:44 am

71maverick wrote:Whats your thats on the cylinder swap? Dont reinvent the wheel??
i never did it so i would'nt know Laughing
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Re: 572 to 598 questions

Post  dfree383 on January 2nd 2013, 1:25 am

71maverick wrote:Whats your thats on the cylinder swap? Dont reinvent the wheel??

If you have the money a head swap will get you some more power, but swaping to the A460 heads means a new intake, and headers (If your BT heads don't have BBC Exhaust ports).

If I was going to go thru all the trouble and expense of doing a head swap and adding inches, I'd look into a C460 top end and run a single toilet. But thats just me.
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Re: 572 to 598 questions

Post  schmitty on January 2nd 2013, 1:52 am

Only bad deal with going to the C heads if that were the choice, is that they don't do so well with intake based injection. To get the power out of them on alky, you really need to consider down nozzle injection. The A's on the other hand will work well with alky if the heads are prepped for it. Keith Fulp made some really good power with A's on alky. If you would rather do gas though, the C's are some really good heads if you are willing to spend the money for them. You will be into them for close to $10k by the time you put them together with good components.
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Re: 572 to 598 questions

Post  466cj on January 2nd 2013, 2:08 am

dfree383 wrote:
71maverick wrote:Whats your thats on the cylinder swap? Dont reinvent the wheel??

If you have the money a head swap will get you some more power, but swaping to the A460 heads means a new intake, and headers (If your BT heads don't have BBC Exhaust ports).

If I was going to go thru all the trouble and expense of doing a head swap and adding inches, I'd look into a C460 top end and run a single toilet. But thats just me.

A's are a lot easier to get into. Keep in mind a C head means stepping up to a shaft rocker setup and Ti valves. Not to mention they are not a ready to run out of the box deal.

I'd say if you are changing pistons and want to step up an A head is a good upgrade.

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Re: 572 to 598 questions

Post  richter69 on January 2nd 2013, 9:13 am

The c headed single toilet deals dont fare too well, ask KY jelly.

Id go to the A heads myself.
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Re: 572 to 598 questions

Post  dfree383 on January 2nd 2013, 9:16 am

richter69 wrote:The c headed single toilet deals dont fare too well, ask KY jelly.

Id go to the A heads myself.

They sure do good with a carb and some gas..........

http://www.429-460.com/t10169-1200-hp-with-single-carb-c-head
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Re: 572 to 598 questions

Post  71maverick on January 2nd 2013, 9:47 am

I talk to ky jelly some... He usually hits me up when he comes to my home track.. I considerd c heads but think i wanna go with the a... I sent nevs the money for his intake and dizzy.. If i sell my heads i will upgrade.. Been talking with Lem and he has been helpful and will get my business... However...if i dont sell my heads and stay with mine..is there a power advantage thats worth the extra $ in a mold of my chambers for pistons?. Is there amy adapter plates to run the a intake on my heads?
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Re: 572 to 598 questions

Post  dfree383 on January 2nd 2013, 9:52 am

No advantage IMO to casting your chamber for what your doing and the compression ratio your after.

As far as adaptors to get a A460 intake on OEM style ports, Your SOL on that front. You only options for a better TR for OEM style heads is either do what I did and chop one up or get a sheet metal one built.
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Re: 572 to 598 questions

Post  71maverick on January 2nd 2013, 10:12 am

Thanks for the input.. Ive got 2 guys interested in my heads and with a little luck i will do heads pistons crank and cam from Lem... Hoping to go from 5.30s 5.40s to some 5.10s 5.20s. Anyone tried or heard of someone trying the cylinder swap on the cam?
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Re: 572 to 598 questions

Post  dfree383 on January 2nd 2013, 10:15 am

I've seen the cam firing order swap done, but only on high end race engines. Supposed to help the bearing life some by evening out the pulses and stress.
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Re: 572 to 598 questions

Post  Wheelie58 on January 2nd 2013, 12:04 pm

71maverick wrote:Thanks for the input.. Ive got 2 guys interested in my heads and with a little luck i will do heads pistons crank and cam from Lem... Hoping to go from 5.30s 5.40s to some 5.10s 5.20s. Anyone tried or heard of someone trying the cylinder swap on the cam?

The Comp cam in my new A headed 618 Interceptor has the 8/2 swap feature.
I have no way of comparing it back to back with a regular firing order of the same spec, but the engine performs well and sounds noticeably different than other A head 605-632s that I have built.
I plan on using a similar cam in the small bore version of the Interceptor project (4.600-4.625 bore), that will go together early this year. (The 618 is 4.675)
I love my old 514 with the Blue Thunder heads, but as you step into the A head world with a larger bore engine, the horsepower capabilities are much greater.
Have fun...
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Re: 572 to 598 questions

Post  71maverick on January 2nd 2013, 12:14 pm

did it loose the ford sound and sound more like a chevy? My dad tells me not to do it because he loves the 7 and 8 sound together at idle. If it runs good though he'll never miss it.. Very Happy
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Re: 572 to 598 questions

Post  Wheelie58 on January 2nd 2013, 12:37 pm

All I can say, is that it sounds nasty as hell.
It makes great power on gas with one carb...2 carbs....or alky with fuel injection.
At this point I don't know if it is the cam as much as cylinder head design and 16 to 1 compression ratio.
I will post a strange video that I took outside the "muffler" room during a pull.
Keith
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Re: 572 to 598 questions

Post  Lem Evans on January 2nd 2013, 12:38 pm

71maverick wrote:did it loose the ford sound and sound more like a chevy? My dad tells me not to do it because he loves the 7 and 8 sound together at idle. If it runs good though he'll never miss it.. Very Happy

Sound like a Chevy? The 4/7 swap that is touted for the chevy V8s is the flat head Ford firing order....as is the 8/2 Ford 'swap'.

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Re: 572 to 598 questions

Post  richter69 on January 2nd 2013, 12:40 pm

dfree383 wrote:
richter69 wrote:The c headed single toilet deals dont fare too well, ask KY jelly.

Id go to the A heads myself.

They sure do good with a carb and some gas..........

http://www.429-460.com/t10169-1200-hp-with-single-carb-c-head


he aint runin gas lol.
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Re: 572 to 598 questions

Post  Wheelie58 on January 2nd 2013, 12:52 pm

This is a short 1200 HP pull on C14 gas.
It is outside the Engine Systems shop late one night.
Poor neighbors...:-)
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