572 to 598 questions

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

pistons should'nt be hard to get without doing the mold.i'd keep the 6.8 rod too.

What's the CCs of the BT heads?

6.800" rod is fine.

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

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

how much compression you look'n for?

Id like to stay in the 14 range

71maverick wrote:Id like to stay in the 14 range

14 should'nt be a problem with 4.5 crank.

Whats your thats on the cylinder swap? Dont reinvent the wheel??

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

i never did it so i would'nt know

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.

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.

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.

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

Id go to the A heads myself.

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..........

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

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?

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.

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?

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.

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...
Keith
678-458-2033

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..

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

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..

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'.

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..........

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

he aint runin gas lol.

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